Table of Content

10 June 2006, Volume 25 Issue 06

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Articles

Dynamics of major elements inDeyeuxia angustifolia litter during its decomposition in Sanjiang Plain

YANG Jisong^1,2; LIU Jingshuang¹;YU Junbao¹; WANG Jinda¹; ZHAO Wei^1,2

2006, 25(06):  597-602 . 

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With litterbag method, this paper studied the mass loss of Deyeuxia angustifolia litter during 16 months of its decomposition in Sanjiang Plain, and the dynamics of the major elements in the litter. The results showed that the annual decomposition rate of D. angustifolia litter was 0.257, and the double exponential model W_t/W₀=0.0399e^-0.545t+0.9601e^0.018t (R²=0.945) could describe the mass loss more effectively. During decomposition, the element accumulation index (NAI)values of C, N, P and Ca were significantly less than 100% (P<0.05), indicating the net release of the four elements, while the NAI values of K and Na were significantly higher than 100% (P<0.05), indicating the net accumulation of these two elements. The NAI values of Mg, Mn and Fe were approached to 100%, which indicated that the release and accumulation of these three elements occurred simultaneously during the decomposition. After 16 months of decomposition, the release rate of the elements fromD. angustifolia litter was in the order of Fe>P>Ca>N>C>Mg>Mn>K>Na, and the corresponding released amount was 0.106, 0.147, 0.971, 0.568, 65.37, -0.017, -0.114, -0.209 and -0.125 g·m^-2, respectively.

Species diversity in four saccessional communites of evergreen broadleaved forest in Gutian Mountain,Zhejiang Province

HU Zhenghua¹;YU Mingjian²

2006, 25(06):  603-606 . 

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By the method of substituting spatial difference for time change,this paper studied the species diversity of 4 successional communities in the evergreen broad-leaved forest of Gutian Mountain Nature Reserve,Zhejiang Province. Sixteen typical plots were investigated and each plant in the contiguous grid quadrates was measured,with Shannon-Wiener index (H),Pielou index (J_SW,J_SI) and Simpson index (D) determined.The results showed that the Shannon-Wiener index of coniferous forest,coniferousbroad leaf mixed forest,Schima superba forest and Castanopsis eyrei forest tree layers was 1.9670,2.4975,2.6140 and 2.4356,respectively,with a tendency from small to big and then to small in the course of succession.Among all successional communities,the species diversity of the shrub layer in coniferous-broad mixed forest was the biggest,with the Shannon-Wiener index 2.8625,while that of the herb layer in coniferous forest was the biggest,with the Shannon-Wiener index 1.5334.As for vertical structure,the species diversity of coniferous forest,coniferous-broad mixed forest and Castanopsis eyreiforest was all in the order of shrub layer > tree layer > herb layer,while that of Schima superba forest was in the order of tree layer > shrub layer > herb layer.During succession,herb layer had the biggest variation in species diversity,with the variation coefficient of H,J_SW,J_SI and D being 0.1572, 0.0806,0.0899 and 0.1884,respectively,while shrub layer had the smallest one,with the variation coefficient of H,J_SW,J_SI and D only being 0.0482, 0.0385, 0.0142 and 0.1553,respectively.

Soil physical properties under effects of Eucalyptus understory vegetation and litter

LI Donghai; YANG Xiaobo; DENG Yunwu;LI Yuelie

2006, 25(06):  607-611 . 

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The study on the soil water content, temperature, bulk density, hardness, and mechanical components under 7 artificialEucalyptus forests and 1 Acacia forest in Dongcheng Town of Danzhou City showed that soil water content in the Eucalyptus forest with 50% coverage of understory vegetation was 11.2～62.9 g·kg^-3higher than that without understory vegetation, and 27.6～38.2 g·kg^-3 higher in the forest with litter coverage than without it. Soil temperature under the Acacia forest with understory vegetation was higher than that with no understory vegetation or with high coverage of forest canopy, but lower than that in open area. Soil hardness under the Eucalyptus and Acacia forests with understory vegetation was 5.49～18.76 kg·cm^-3 lower than that without understory vegetation, and soil bulk density under the Eucalyptus forests with high coverage of understory vegetation was 0.33～0.48 g·cm^-3 lower than that with low coverage of understory vegetation or without it, under Acacia forest, and at the plot with 30% of herbage coverage. The results indicated that understory vegetation, litter, and forest canopy were the important factors affecting the soil physical properties under Eucalyptus and Acacia forests, and thus, it was very important to remain some understory vegetations and litters of these forests for improving soil physical characteristics and developingEucalyptus and Acacia forests.

Effects of N and P fertilization on nutrient dynamics of semi-arid sandy grassland vegetation

LIU Dayong^1,2;CHEN Ping³; FAN Zhiping¹; YU Zhanyuan^1,2

2006, 25(06):  612-616 . 

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In many terrestrial ecosystems, nitrogen (N) and phosphorus (P) are the most limiting nutrients. In order to determine the nutrient status in semiarid sandy grassland in Keerqin, this paper examined the nutrient dynamics of Artemisia scoparia and Pennisetum flaccidum in their growth period under different fertilizer additions, and based on the principles and methods of N∶P stoichiometry method, investigated the nutrient limit in the grassland. The results showed that the N and P concentrations of A. scoparia and P. flaccidum aboveground biomass had a significant seasonal dynamics under different fertilizer additions. The N concentration of the two species decreased with time, and its dynamics could be simulated by linear model (Y=a+bX) and power function model (Y=aX^b). The coefficient b in the equations could be used to indicate the relative growth rate of the shoot under different nutrientstatus. The relationship of P concentrations of the two species with time could be simulated by quadratic equation (Y=aX²+bX+c). Comparing with the nutrient concentration under different fertilizer additions, N was the main limiting nutrient to most species in semi-arid sandy grassland in Keerqin. N fertilizer addition increased N concentration and N:P ratio of the aboveground biomass. P fertilizer addition had little effects on A. scoparia, but increased the P concentration and N:P ratio of P. flaccidum.

Age structure of Leymus chinensis population modules in different habitats of Zhalong Nature Reserve

JIAO Dezhi^1,2; DING Xuemei¹;YANG Yunfei¹

2006, 25(06):  617-620 . 

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The study on the age structure of Leymus chinensis population modules in three habitats of Zhalong Nature Reserve showed that at the waxen maturity stage of the population (by the end of July), the tillers were composed of three age classes, with the 1st and 2nd age classes the dominant and the 3rd age class the least, and presented in an increasing age structure. There were 1 080 tillers·m^-2 in inter-forest sand soil, 1 290 tillers·m^-2 in sand soil, and 1 011 tillers·m^-2 in meadow soil. The rhizomes were composed of four age classes, with 8 000 cm·m^-2 of accumulative length in sand soil and 6 948 cm·m^-2 in meadow soil, and presented increasing age structure. The dry matter storage in rhizomes decreased with increasing age. There were four age classes of buds, with the largest number (2 279 buds·m^-2) in meadow soil, the second (2 113 buds·m^-2) in sand soil, and the least (1 410 buds·m^-2) in interforest sand soil. The buds were also of increasing age structure.

Measurement of scenic beauty of urban forest landscape

SONG Li^1,2,3; HE Xingyan¹;XU Wenduo¹; ZHANG Jie^3,4

2006, 25(06):  621-624 . 

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Employing the scaling procedure for representing visual preference or scenic beauty (Scenic Beauty Estimation, SBE), and based on the techniques of psychophysical paradigm to identify the degree of visual preference by selected groups of public, this paper investigated the visual qualities of selected vegetation groups in urban parks, the typical urban forest in Shenyang. A total of 32 vegetation groups in three urban parks were selected, including more than 120 tree and shrub species and presenting diverse plant mode in Shenyang. Sets of 39 color photographs of these vegetation groups were presented to 136 individuals at formal interviews. Among them, there were 72 college students and 64 persons selected randomly. Statistical analysis of the judgments led to three main conclusions: (1) scenic beauty of vegetation groups in urban forest could be evaluated by psychophysical method, using photographs as the media that represented the landscapes; (2) the scales represented scenic beauty or visual preference for vegetation groups based on different judgers were distributed normally, and had an acceptable level of coincidence; and (3) significant differences could be found between the best samples and the worst samples selected by different evaluating groups, which might be derived from the individual plants' physical properties, shadings, and spatial sense of the plants. This study provided an empirically tested basis for plant planning, management, and further research in future.

Nitrogen and phosphorus pollution from urban stormwater runoff in Xiamen City

YANG Demin^1,2; CAO Wenzhi¹;CHEN Nengwang¹;WANG Jiping¹; XU Yuyu¹

2006, 25(06):  625-628 . 

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In this study, the stormwater samples of 4 storm events occurred in April and May 2005 were collected from different representative sites including road, roof, and residential, commercial and industrial districts in Xiamen Island. All the samples were delivered to laboratory within 24 h, and their NO₃^--N, NH₄⁺-N, dissolved total nitrogen (TN), and total phosphorus (TP) contents were analyzed. The water quality data showed there was a significant difference in the nitrogen and phosphorous concentrations of the stormwater runoff from different sites,with the mean value of TN, NO₃^--N, NH₄⁺-N and TP ranged as 1.96-6.77, 0.62-4.89, 0.35-1.18 and 0.04-0.66 mg·L^-1, respectively. In general, the nitrogen and phosphorus concentrations decreased gradually in the process of precipitation due to water dilution, but the nitrogen concentration fluctuated more intensively than phosphorus. Many factors such as precipitation intensity, land cover and vehicle exhaust affected the patterns of nitrogen and phosphorus transportation. The urban stormwater runoff collected from road and commercial and industrial districts contributed a higher nutrient loading, and thus, the management of urban stormwater runoff should be focused on these sites.

Correlation between land use and soil erosion intensities based on GIS: Taking Loess Plateau in North Shaanxi Province as an example

ZHOU Zixiang;REN Zhiyuan

2006, 25(06):  629-634 . 

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Employing GIS, grid-maps and order correlation analysis, this paper studied the correlation between land use- and soil erosion intensity on the Loess Plateau of Northern Shaanxi Province. The results showed that in this region, soil erosion intensity was highly related to land use intensity, indicating that land use intensity was the main driving force of soil erosion. Regression analysis suggested that the effect of land use intensity on soil erosion intensity was determined by the integration of natural factors, e.g., in flat and humid areas, human activity had a less effect on soil erosion intensity, and vice versa.

Ecological characters of pelagic Cladocera in the East China Sea

XU Zhaoli;WANG Yunlong; YUAN Qi

2006, 25(06):  635-639 . 

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Based on the four seasons investigation data from 1997 to 2000, this paper analyzed the ecological characters and quantitative variations of Cladocera in the East China Sea (23°30′～33°00′N, 118°30′～128°00′E). The results showed that the total abundance of Cladocera was the peak in summer (17.16 ind·(100 m³)^-1), the second highest in autumn (14.68 ind·(100 m³)^-1) and the lowest in spring (0.63 ind·(100 m³)^-1), while no occurrence in winter. Evadne tergestina in spring, summer and autumn and Penilia avirostris in summer were the species dominating the variation of the total abundance. In spring, summer and autumn, the total abundance of Cladocera had a negative linear correlation with the salinity of seawater, but no significant correlation with water temperature. The areas with high abundance of Cladocera were usually located at the side of the dilute waters from continental rivers in the converging area of the dilute waters and other water masses, suggesting that the variation of the total abundance of Cladocera was dependent on the eat and flow of the dilute waters, especially that of the Changjiang dilute waters in the East China Sea. The zooplankton, with lower occurrence frequency and aggregated distribution, was a kind of indicator species for the dilute waters. Its high abundance areas were basically restricted in the waters of the dilute waters, and water with high abundance was a sign of the dilute water.

Effects of methamidophos on soil microbial communities measured by PLFA, CLPPs and ARDRA markers

WANG Mengcheng; YANG Yonghua;ZANG Hongbing

2006, 25(06):  640-645 . 

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With a combined approach of phospholipid fatty acid (PLFA), community level physiological profiles (CLPPs) and amplified ribosomal DNA restriction analysis (ARDRA), this paper evaluated the effects of methamidophos continuously applied for2 and 4 years on the structural, functional and genetic diversities of soil microbial communities. The results showed that the application of methamidophos reduced the microbial biomass but enhanced the quantity of Gram-negative bacteria, and increased the functional diversity of micriboal communities while decreased their genetic diversity. After 2 years application, high dosage methamidophos had more significant effect on the microbial communities than low dosage methamidophos, while after 4 years application, these two dosages had the similar significant effect, suggesting that different concentrations of methamidophos applied for a long period all had a distinguishable and severe impact on soil microbial communities.

Dynamics of phosphorus and biomass accumulation ofCalamagrostis angustifolia in Sanjiang Plain wetland

QIN Shengjin^{1, 2}; LIU Jingshuang¹;SUN Zhigao¹

2006, 25(06):  646-651 . 

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This paper studied the seasonal dynamics of phosphorus and biomass accumulation of two types Calamagrostis angustifolia in Sanjiang Plain wetland, aimed to explore the relationship between phosphorous uptake by the plants and their biomass accumulation, and to understand the characteristics of phosphorus accumulation and transference in wetland ecosystem. The results showed that for the two types of C. angustifolia, there was a distinct seasonal variation of aboveground and underground biomass and phosphorus accumulation, but the extent was differed with plant type, which should be related to the habitat condition and the physiological adaptability of the plants. Phosphorus was very important for the early growth of C. angustifolia, while habitat was not the main factor affecting phosphorus accumulation.

Spatial distribution pattern, its scale, and gap characteristics of Pinus armandiipopulation in Qinling Mountains

LAN Guoyu^1,2,5; LEI Ruide²; AN Feng¹; ZHAO Yonghua³ ;CHEN Wei⁴

2006, 25(06):  652-656 . 

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Based on the data collected from 27 plots of Pinus armandii community in the Qinling Mountains, this paper studied the spatial distribution pattern, its scale, and gap characteristics of P. armandii population. The results showed that P. armandii population had a contagious distribution before age 50. At the age from 15 to 20, though the population tended to distribute randomly, the distribution was still contagious. The population at the age from 40 to 50 was at the transitional stage from contagious to random distribution. After age 50, the population started to be senesced, with the distribution pattern turned from contagious to random. The distribution pattern scale of P. armandii always changed with the development stage of the population, being 100 m² in general. The gap size of P. armandii population was similar to its distribution pattern scale, and the gaps of 80～130 m² occupied 59% of the total. Because of the better light and nutrient conditions in the gap, P. armandii seedlings grew well, which helped the population kept its stability though ‘mobile mosaic circle’.

Dynamics of phytoplankton composition and abundance in Feilaixia reservoir

HE Guoquan;HAN Boping

2006, 25(06):  657-662 . 

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An investigation on the trophic status and phytoplankton in Feilaixia reservoir in flood- and dry season of 2000, 2001 and 2002 showed that in the three years, total phosphorus (TP) concentration had a sharp decrease, while total nitrogen concentration (TN) had no remarkable variation. The species number of phytoplankton increased from 29 in 2000 to 99 in 2001 and 2002, among which, Chrolophyceae and Bacillariophyta contributed most, with an increase of 34 and 27, respectively. The phytoplankton abundance was ranged from 13.4×10⁴ cell·L^-1 to 41.6×10⁴ cell·L^-1, being the lowest in 2000, and the highest in 2001. In the flood season of 2000, the phytoplankton abundance was mainly contributed by cyanobacteria and dominated by Pseudanbeana spp., while in the dry season of this year, the abundance was mainly contributed by diatoms and dominated by Melosira granulate. In the flood season of 2001 and 2002, Chlorophyta and Cyanophyta had high abundance, and became dominant groups together with diatoms. Cyanobacteria was dominated by Psudoanbeana spp., Dactylococcopsis sp. and Gloeocapsa sp. Chrolophyceae was dominated by Chlamydomonas spp. and Dictyospharium pulchellum, and Bacillariophyta was dominated byCyclotella menighiniana andSynedra spp., while in the dry season of these two years, Melosira granulata and Melosira varians were predominated.

Behavioral mechanism of mutualaid interactions between ant and Kerria lacca Kerr

CHEN Youqing; WANG Shaoyun

2006, 25(06):  663-666 . 

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The study on the mutual-aid interactions between ant and Kerria lacca Kerr in Yuanjiang County of Yunnan Province showed that after hosting, K. lacca could attract some ants to attend them. Before and after K. lacca hosting, the frequency of ants visiting Schleichera oleosa was 3.5 and 11.2 times· min^-1, and the numbers of visiting ants were 3-8 and 11-23 on one branch, respectively. The category of ants visiting Acacia montana had some differences, but for S. oleosa, it was absolutely different. Ants didn’t eat K. laccalarvae, and also, did not disturb the natural enemies of K. lacca. The attending of ants made K. lacca have more chance to survive, secret more lac by per female, and have bigger weight of female adult. Some specialized ants had mutual-aid relationship with K. lacca, but the category of ants changed with time and place. The behavioral mechanism of mutualaid interactions between ant and K. lacca was not just translated as supporting honeydew and utilizing it. Ants liked newly secreted honeydew, and the changes of the metabolism of host trees and the ratio of all components of honeydew could influence ant’s decision.

Community structure and diversity of acaroid mite in South Anhui Province

TAO Li; LI Chaopin

2006, 25(06):  667-670 . 

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To study the community structure and diversity of acaroid mite in South Anhui Province, samples from four different habitats were collected, isolated and identified. A total of 3650 acaroid mites were detected, belonging to 7 families, 20 genera and 32 species. Diversity analysis showed that the species number S, species richness index R, and species diversity index H′ of acaroid mite in the habitats were in the order of warehouse＞external environment＞human habitat＞work environment. The species evenness index J′of acaroid mite community was the highest in external environment, while the highest value of species domination indexD was observed in work environment. The acaroid mite community in work environment was most different from that in external environment. The results suggested that habitat condition directly influenced the community structure and diversity of acaroid mite, and human disturbance was also an important affecting factor.

Flora of wild vascular bundle plants in mountainous area of Beijing

XING Shaohua; LIN Daying; YUAN Xiu; XIAO Yanqing;ZHAO Bo;CUI Guofa

2006, 25(06):  671-676 . 

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In Beijing mountainous area, there are 1166 species of vascular bundle plants, belonging to 122 families and 503 genera, among which, there are 62 species of fern plants, belonging to 17 families and 26 genera, 7 species of gymnosperm, belonging to 3 families and 7 genera, 863 species of dicotyledon, belonging to 88 families and 371 genera, and 234 species of monocotyledon, belonging to 14 families and 99 genera. The statistics of dominant families and genera showed that the species fastened on several cosmopolitan families, such as composite and rose, and on the other hand, distributed to single-species or few-species family. There are 1 single-species family and 6 single-genus families in Beijing mountainous area, and 72 single-species and few-species genera are found in the area, including 31 single-species genera. In all 477 genera, there are 264 genera of seed plants belonging to temperate distribution, accounting for 55.34%. The second is pan-tropic distribution type, including 60 genera and accounting for 12.43%, and endemic China distribution type only has 11 genera, occupying 2.31% of the total.

Ecosystem sensitivity assessment of Liaoning Province

WAN Zhongcheng¹;WANG Zhijiang²; DONG Lixin²;WANG Yansong¹;CHEN Daguang¹;LI Xuan¹; XU Shaoli ¹

2006, 25(06):  677-681 . 

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Based on the formation mechanisms of the main eco-environmental problems in Liaoning Province, this paper studied the regional differentiation patterns of ecosystem sensitivity, and analyzed the sensitivities of manifold eco-environmental problems in the Province. The results showed that the areas of high, medium, and low ecosystem sensitivity in the Province occupied 34%, 62.66%, and 3.34 % of its total terrestrial area, respectively. High ecosystem sensitivity area mainly distributed in east Liaoning mountainous region, Liaodong peninsula, west Liaoning hilly region, northwest Liaoning, Liurao area, and Dawa County, among which, east Liaoning mountainous region, Liaodong peninsula and west Liaoning hilly region were of high sensitivity on soil erosion, northwest Liaoning and Liurao area were of high tenderness on desertification, and Dawa County was delicate in soil salinization.

Management measures for riverside belt vegetation based on biodiversity conservation: With Erdaobai River in Changbai Mountains as an example

WANG Qingchun^1,2; DENG Hongbing³;WANG Qingli⁴

2006, 25(06):  682-685 . 

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The upper reach of Erdaobai River in Changbai Mountains is rich in biodiversity. With its riverside belt as research object, and based on the analysis of the significance of riverside vegetation management in biodiversity conservation, this paper put forward the management measures for riverside belt and its vegetation, which would provide theoretical model for biodiversity conservation in riverside belt, and offer references to bring the ecological conservation into effect during the course of riverside belt exploitation and utilization.

Characteristics of various patterns and types of contemporary and new-type agriculture

LI Dongpo¹; WU Zhijie¹; CHEN Lijun¹; MA Fang²; LI Yong²; ZHOU Ruzhong²; ZHANG Baoning²

2006, 25(06):  686-691 . 

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This paper discussed the connotation， characteristic， guiding ideology， and development prospects of various patterns and types of contemporary and new-type agriculture， and analyzed the emergence background and principles of sus-tainable agriculture，ecological agriculture， organic agriculture， precision farming， construction agriculture， white agriculture， urban agriculture， quality agriculture， blue agriculture， natural agriculture， biological agriculture， bio-dynamical agriculture， intensive agriculture， and varieties of new-type agriculture. It was indicated that each of these patterns and types was pervasive and complementary with each other， and many of them paid more attention to rely on the cycle of agro-ecosystem itself and to the production processes be beneficial to the improvement and protection of ecological environment. These patterns and types of contemporary and new-type agriculture rejected to use contemporary chemical products， emphasized environment consciousness， neglected agricultural production function and income， and consequently， reduced product benefit and productiveness. Facing to the new problems of increasing population and decreasing tillable field amount， some of these agricultural patterns were difficult to apply widely. If the distillations of these patterns could be combined together， a contemporary agriculture with powerful activity would be formed， and represent the tendency of agriculture development in 21 century.

Research advances in water consumption controlling mechanisms of forest tree species

XI Ruchun^{1, 2}; MA Lüyi¹; WANG Ruihui¹; Xu Junliang¹

2006, 25(06):  692-697 . 

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Water consumption of tree species is an important parameter of afforestation designs and environment water project researches. This paper summarized the researches on the stoma and none-stoma controlling mechanisms for leaf transpiration of tree species, the mechanisms of conduits cavitation and xylem embolism, and the concept of wood tissue water capacitance. The important actions and significance in controlling sap flow process were discussed, and further researches of water consumption controlling mechanisms of forest tree species were prospected, including the mechanisms of noon-break transpiration and night-time transpiration, effects on stoma oscillation and compensation, critical revival or conditions of conduits cavity and xylem embolism, as well as controlling mechanisms of wood tissue water capacitance.

Research advances in mechanisms of physiological-ecological adaptation of cool-season turfgrass under high temperature stress

XU Sheng^1,2;LI Jianlong²; HE Xingyuan¹;CHEN Wei¹

2006, 25(06):  698-702 . 

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High temperature is one of the important ecological factors limiting the growth and development of cool-season turfgrass, especially during hot summer in transitional and warm climatic areas. Fortunately, this type of turfgrass exhibits some physiological and ecological adaptation mechanisms, e.g., the change of membrane lipid component, elimination of active oxidative species (AOS) by antioxidant systems, and accumulation of heat shock protein (HSP), for acquiring heat tolerance to protect itself against the damage by heat stress. Based on our several years researches and the literatures published at home and abroad about cool-season turfgrass under heat stress, this paper summarized and discussed the physiologicalecological adaptation mechanisms of cool-season turfgrass under high temperature stress, which could be helpful to provide academic and practical evidences in improving the thermo-tolerance of cool-season turfgrass.

Current research status and prospects of ecological degeneration and restoration at the juncture of Shanxi, Shaanxi and Inner Mongolia

WANG Yinggang¹;ZHANG Qiuhua¹; ZHANG Feng²

2006, 25(06):  703-706 . 

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The region at the juncture of Shanxi, Shaanxi and Inner Mongolia is one of the most serious regions of ecological imbalance in China. A series of ecological issues in the region, such as vegetation degeneration, soil erosion, soil desertification, and so on, not only threatened local people's livelihood and development, but also affected the environmental quality and economical development of eastern China. Therefore, it is of significance to study the theory and technology of ecological restoration in the region. This paper analyzed the historical and current status of theoretical research and practical application of ecological restoration in the region, and put forward some suggestions on strengthening the researches of the mechanisms of vegetation degeneration, the determination of target communities for vegetation restoration, and the ways of carrying out ecological restoration on big scale area, which would benefit the development of ecological restoration in the region.

Index of biological integrity and its application in health assessment of aquatic ecosystem

WANG Beixin^1,2;YANG Lianfang¹;LIU Zhenwen²

2006, 25(06):  707-710 . 

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Index of biological integrity (IBI) has been proved to be one of the useful measures in health assessment of aquatic ecosystem, and is widely applied today. In this paper, the concept of IBI, its philosophy and steps in health assessment of aquatic ecosystem, and the built-up of benthic-index of biological integrity (B-IBI) were generalized, and the performances of IBI applied for the health assessment and management of ecosystem in foreign countries were illustrated. The practice of IBI in health assessment of our aquatic ecosystem was also suggested.

Evaluation of agro-ecosystem health in Gansu Province

WANG Jing; WEI Yuanming

2006, 25(06):  711-715 . 

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Through the analysis of agro-ecosystem in Gansu Province, the evaluation indices, criteria, and comprehensive model for agro-ecosystem health were built, and AHP method was used to analyze the status of agro-ecosystem health in this Province. The results showed that the agro-ecosystem health status was relatively better in partial regions of Gansu Province, e.g., Longnan, Linxia and Gannan, but at a lower level in other regions. The values of natural environmental factors related to the system structure of this Province were lower, especially in some districts of Hexi arid area whose system structure value was less than 2. Other regions except Baiyin district had a little difference in system structure value (higher than 2), and the values in Longnan and Gannan regions were relatively higher. From the viewpoint of economy, the economic indices values of Hexi arid area were higher than other regions in Gansu Province.

Phytoremediation of organic pollutants-contaminated environment: A research review

WEI Shuhe¹; ZHOU Qixing¹; Pavel V. Koval²;Galina A. Belogolova²

2006, 25(06):  716-721 . 

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Phytoremediation is a kind of technology which can thoroughly remove organic pollutants from contaminated sites through phytoextraction, phytodegradation, and rhizosphere biodegradation. In contrast to many physical and chemical remediation technologies which are hardly used to clean organic pollutants- contaminated soil in large area because of their expensive cost and potential destruction to polluted environment, phytoremediation has the advantages of relatively lower cost, smaller environmental disturbance, and reuse of natural resources, and has been one of the hot spots and frontiers of environmental science. This paper reviewed the contamination mechanisms of main organic pollutants in environment and the recent studies on phytoremediation, and gave prospects on the strengthening methods of organic pollutantsphytoremediation.

An approach on the connotation of “ecological environment”

LIU Xiaodan;SUN Yinglan

2006, 25(06):  722-724 . 

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“Ecological environment” is a term frequently employed in China, but often misused because there is no universal and explicit definition of it. This phenomenon has brought about some disadvantages to both theoretical study and practical work. In this paper, the origin of the term was traced, and different comprehensions of it were comparatively analyzed. It was considered based on the principles of ecology and environmental science that “ecological environment” was the integration of various ecological elements and relations, with specific organisms including human beings as the center, and emphasized the global nature, continuity, stability, coordinated evolution, and environmental functions of ecosystems.