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cje    Abstract （1983）      PDF（pc） （376KB）（9638）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Effects of global warming on constructive species of Leymus chinensis grassland in Inner Mongolia of China ZHOU Qin1; LIU Qinpu1,2; LIN Zhenshan2  cje    Abstract （2783）      PDF（pc） （466KB）（7456）       Knowledge map    Save Based on the 1981~1994 investigation data about the temperature and vegetation of Leymus chinensis grassland in Inner Mongolia of China,this paper analyzed the dynamics of climate and vegetation change in this area.The results showed that the minimum temperature of this area increased faster than the maximum and average temperature.The importance value and above ground net primary productivity (ANPP) of L.chinensis, the first constructive species of the grassland, decreased because of global warming during the period of 19811994,while those of Stipa grandis,the second constructive species,increased in view of competition.If these trends went ahead,there existed the possibility that S.grandis might replace L.chinensis,and gradually become the dominant constructive species,which would in turn change the structure and function of the grassland.The competition between dominant species should be paid attention in the studies on the responses of L.chinensis grassland to temperature change,which would be helpful to understand the response mechanism of individual species and ecosystem to global climate change. Related Articles | Metrics | Comments（0）

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cje    Abstract （1750）      PDF（pc） （257KB）（3323）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Chemical forms of soil heavy metals and their environmental significance HAN Chunmei, WANG Linshan, GONG Zongqiang, XU Huaxia cje    2005, (12): 1499-1502.   Abstract （1912）      PDF（pc） （409KB）（3098）       Knowledge map    Save This paper introduced the chemical forms of soil heavy metals and their analytical methods,with the focus on the distribution and conversion of different form heavy metals and their affecting factors.The chemical forms of soil heavy metals are of significance for evaluating their mobility and bioavailability,and the possibility of soil remediation,while chemical form analysis could reflect the contributions of natural and human activities to the sources of soil heavy metals and their ecotoxicities.Soil heavy metals could have different toxicities and environmental behaviors due to their chemical form conversion. Reference | Related Articles | Metrics | Comments（0）

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Evaluation methods for soil heavy metals contamination: A review. cje    2011, 30 (05): 889-896.   Abstract （4397）      PDF（pc） （622KB）（2825）       Knowledge map    Save Due to the long-term residence and accumulation in environment, soil heavy metals had many realistic and potential risks to the ecological environment and human health, being come under more and more attentions. To evaluate the soil heavy metals contamination degree is of significance to the environmental and human health issues, which needs a kind of or several kinds of correct evaluation methods. This paper summarized several related evaluation methods commonly adopted at home and abroad, including index method, model index method, speciation analysis- based method, quantitative analysis of available and total heavy metals contents, human health risk assessment method, and GIS and geostatistics-based method. The index method mainly includes Nemerow index method, enrichment factor method, geo-accumulation index method, and potential ecological hazard index method; and the model index method mainly includes fuzzy mathematics model, grey clustering model, and analytic hierarchy process, etc. The advantages, disadvantages, and limitations of the related methods were also discussed. Related Articles | Metrics | Comments（0）

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Research advances in phytoremediation and its mechanisms of POPs-contaminated soils. PENG Sheng-wei1; ZHOU Qi-xing1,2 cje    Abstract （2356）      PDF（pc） （265KB）（2667）       Knowledge map    Save There is an increasing organic pollution in the environment, because human being is more and more relying on chemicals. Phytoremediation of organic pollutants-contaminated soils is an on-site remediation technology based on the plant absorption, degradation, and passivation of organic pollutants, and characterized by low-cost, low-risk, and low side-effect to the environment. In this paper, some recent research advances in phytoremediation of organic pollutants-contaminated soils both at home and abroad were summarized, with the focus on the phytoremediation of PCBs, PAHs, pesticides, and nitrylaromatic compounds. The key mechanisms of phytoremediation for soils contaminated by organic pollutants were expounded, and the limitations of this technology as well as the affecting factors that should be considered in an actual project were analyzed. Future directions of this research field were pointed out. Related Articles | Metrics | Comments（0）

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cje    Abstract （1851）      PDF（pc） （241KB）（2607）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Spectral analysis of turbulence characteristics under different atmospheric stability regimes in Horqin grassland. cje    2009, 28 (12): 2495-2502.   Abstract （1936）      PDF（pc） （1040KB）（2585）       Knowledge map    Save By using eddy covariance method, this paper dealt with the power spectra and cospectra of turbulence under three atmospheric stability regimes, i.e., unstable, near neutral, and stable, in Horqin semi-arid sandy grassland. The power spectra of longitudinal and lateral velocities under the three atmospheric stability regimes were similar, and in accordance with the -2/3 law. The power spectra of vertical wind speed had no inertial sub-ranges under near neutral atmospheric stratification, which indicated that the three-dimensional sonic anemomcter didn’t totally capture the signal. Under the stable atmospheric condition, there were horizontal turbulence motions and molecular diffusions. Moreover, the power spectra of both CO2 and H 2O illustrated that the open-path eddy covariance system could satisfy the estimation of turbulence fluxes over canopy, and the peaks of the power spectra were shifted to the high frequency end. The cospectra of vertical wind speed with three scalars were similar, with the inertial subranges of cospectra becoming shorter from unstable to stable atmospheric conditions and conforming to the -4/3 law, which illustrated that the spatial separation of instruments didn’t affect the observed fluxes. Related Articles | Metrics | Comments（0）

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Pollution sources, environmental residues, and ecological toxicity of pharmaceuticals and personal care products (PPCPs): A review. cje    2009, 28 (09): 1878-1890.   Abstract （2583）      PDF（pc） （498KB）（2477）       Knowledge map    Save With the large scale development of pharmaceutical and cosmetic industries, the production and use amount of pharmaceuticals and personal care products (PPCPs) are remarkably increased, resulting in the PPCPs remaining in water, soil, and air environment. Regrettably, as a large class of environmental pollutants, PPCPs have not drawn adequate attention till the late 1990s. Due to the continuous input to the environment in high quantity, the residual concentration of PPCPs is increasing, and gradually shows ecological toxicity to the microorganisms, plants and animals, and even, potential ecological risk to human beings. Based on the sum-up of published literatures, this paper analyzed the pollution sources and environmental remaining of PPCPs, as well as the ecological toxicity of residual PPCPs to the microorganisms, plants, animals, and human beings. The main scientific issues related to PPCPs, which should be researched in the future, were suggested. Related Articles | Metrics | Comments（0）

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Plant-microorganism combined remediation of heavy metals-contaminated soils: Its research progress. NIU Zhi-Xin;SUN Li-Na;SUN Tie-Hang cje    2009, 28 (11): 2366-2373.   Abstract （2677）      PDF（pc） （283KB）（2450）       Knowledge map    Save Bioremediation is one of the important means in controlling soil heavy metals pollution, which has the advantages of environmentally friendly and cost-effective, and attracted much attention around the world. This paper discussed the principles and forms of plant-microorganism combined remediation, and introduced the research progress on the behaviors of heavy metals in soils, the physiological and biochemical characteristics of plants, and the changes in rhizosphere environment under the remediation. Some perspectives for future research were proposed. Reference | Related Articles | Metrics | Comments（0）

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Quantitative detection of rice stripe virus in Laodelphax striatellu under different CO2 concentrations. cje    2010, 29 (09): 1782-1787.   Abstract （1907）      PDF（pc） （516KB）（2444）       Knowledge map    Save Accurate detection of populations virus-carrying rate and individuals rice stripe virus (RSV) content of small brown planthopper (Laodelphax striatellu) is one of the important references to predict whether the rice stripe disease could outbreak under elevated CO2 concentration. In this study, qualified RT-PCR assay (qRT-PCR) was employed to detect the RSV content in L. striatellu under different CO2 concentrations. Among the test three CO2 concentrations (370, 470, and 570 μl·L-1), 470 μl·L-1 of CO2 was most favorable to the multiplication of RSV in L. striatellu. Compared with the commonly used ELISA (enzyme-linked immunosorbnent assay) and DIBA (dot immunobinding assay), qRT-PCR was more rapid, sensitive, and specific, and didn’t need antiserum preparation, being easily to be popularized. Related Articles | Metrics | Comments（0）

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Shoot-branching control with strigolactones: Research progress. cje    2011, 30 (02): 349-356.   Abstract （1855）      PDF（pc） （773KB）（2442）       Knowledge map    Save Plant can regulate the formation and subsequent outgrowth of axillary buds in axils via endogenous hormones or environmental cues, and accordingly, control the characteristics of shoot-branching. Strigolactones (SLs), previously known as the principal plant-derived signals triggering the seed germination of parasitic plants and promoting the arbuscular mycorrhizal symbiosis, are the carotenoid-derived signals exuded from plant roots. Recent studies demonstrated that strigolactones can move upwards to the stem, and, together with endogenous auxin and cytokinin, directly or indirectly inhibit the outgrowth of axillary buds. Now, strigolactones are thought to be a new kind of hormone. In this paper, the research progress in the structure, synthesis pathway, and bioactivity of strigolactones was reviewed, and the prospects in the applied fields such as how to use strigolactones to inhibit parasitic weeds, develop new herbicides, promote the symbiosis of plants and beneficial fungi, and control the branching and architecture of crop plants were also discussed. Related Articles | Metrics | Comments（0）

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Advances of studies on soil microbial diversity and environmental impact factors ZHANG Wei, WEI Hailei, GAO Hongwen, HU Yuegao cje    2005, (1): 48-52.   Abstract （1557）      PDF（pc） （456KB）（2440）       Knowledge map    Save There are abundant microorganism sources in soil and various microbial communities in each type of soil ecosystem.Microbial diversity not only depends on but also serves for ecosystem.In this paper,soil microbial diversity was explained with species diversity,genetic diversity,diversity of ecological type and functional diversity.The relationship between soil microbial diversity and environmental factors,such as soil character,plant community and climate type was summarized and discussed.Furthermore,some problems and suggestions were put forward for the further study of soil microbial diversity. Reference | Related Articles | Metrics | Comments（0）

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Effects of climate change on vegetations on Qinghai-Tibet Plateau: A review. YU Hai-ying; XU Jian-chu cje    Abstract （2460）      PDF（pc） （372KB）（2363）       Knowledge map    Save This paper summarized the effects of air temperature and precipitation on the sp atiotemporal variation of the vegetations on Qinghai-Tibet Plateau from the 196 0s to the early 2000s. During this period, both the air temperature and the prec ipitation in this area had a general increasing trend, but existed annu al, seasonal, and geographical variability. Under the effects of this climate ch ange, vegetations had larger spatial and temporal variations. The vegetation cov er in central and northwest parts of the Plateau tended to decrease, while that in southeast part tended to improve. In the meanwhile, the timing of green- and yellow-turning of the vegetations as well as their species composition and com munity structure in some areas varied, and the vertical and horizontal vegetatio n belts moved. Net primary production showed a general increasing trend, while t he biomass in some areas was decreasing and the eco-environment was deteriorati ng, mainly due to freeze-thaw erosion and desertification. The future long term researches at both micro and macro levels to further confirm the effects of cli mate change on the vegetations were recommended. Related Articles | Metrics | Comments（0）

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New tools for prokaryote diversity study. cje    2010, 29 (11): 2249-2257.   Abstract （1532）      PDF（pc） （694KB）（2358）       Knowledge map    Save Prokaryote, which is widespread in nature, makes a big biomass and participates in a variety of global material cycles and energy transfer. However, the measurement of prokaryote diversity has been limited by technique for a long time. With the development of new techniques such as high-throughput sequencing technique and biochip,  the research approaches for prokaryote diversity study have being changed. At present, Genome Sequencer FLX (GS FLX) and Illumina Genome Analyzer are the major approaches for environmental prokaryote diversity study, and GeoChip is the representative of the biochips. Nevertheless, each new emerging technique has its own characters. Some problems as how to use a mass of sequences to measure the prokaryote diversity and which approaches be more appropriate are the issues confronted by the related researches. This paper reviewed and compared the newest research means and computer program tools for prokaryote diversity study, and summarized the main research approaches adapting to the present technical conditions for this study. Related Articles | Metrics | Comments（0）

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A Review on the Species Diversity of Plant Community Wang Dianpei, Ji Shuyi, Chen Feipeng cje    2001, (4): 55-60.   Abstract （1423）      PDF（pc） （524KB）（2345）       Knowledge map    Save The study achievements on the species diversity of plant community were summarized, which included the diversity study methods, the mechanism of origin and sustain of diversity, the environmental and biological factors affecting the diversity changes, the ecological impact of diversity changes. Reference | Related Articles | Metrics | Comments（0）

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cje    Abstract （1545）      PDF（pc） （182KB）（2205）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Characteristics and Ecological Effects of the Active Organic Carbon in Soil Shen Hong, Cao Zhihong, Hu Zhengyi cje    1999, (3): 32-38.   Abstract （1639）      PDF（pc） （929KB）（2203）       Knowledge map    Save The active organic carbon in soil involved dissolved organic carbon,available carbon, mineralizable carbon, oxidizable carbon,and microbial biomass carbon . The determining methods of the active organic carbon in soil and its relation to environmental factors were reviewed. Some recent research results on the active organic carbon in soil and its ecological effects were discussed. Based on this, some prospects on the active organic carbon in soil and its ecological effects were put forward. Reference | Related Articles | Metrics | Comments（0）

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Enrichment characteristics of Cd and Pb by four kinds of plant under hydroponic culture. cje    2010, 29 (02): 261-268.   Abstract （3077）      PDF（pc） （445KB）（2180）       Knowledge map    Save A hydroponic experiment with different concentrations of Cd and Pb was conducted to investigate the capabilities of sunflower, ricinus, alfalfa, and mustard in accumulating Cd and Pb. After treated for five weeks, the Cd and Pb contents in the roots and shoots of test plants increased with increasing concentrations of medium Cd and Pb. In treatment 20 mg Cd·L-1, sunflower roots had the highest Cd content (237.86 mg·kg-1), and its shoots accumulated 89.48 mg·kg-1 of Cd. In treatment 200 mg Pb·L-1, mustard roots showed better capability in enriching Pb (597.22 mg·kg-1). In treatment 100 mg Pb·L-1, sunflower shoots had the highest content of Pb (318.33 mg·kg-1). For the test plants, the enrichment coefficients of Cd and Pb decreased with increasing concentrations of medium Cd and Pb, and had definite correlations with plant biomass and the concentrations of medium Cd and Pb. In the treatments with combined application of Cd and Pb, there existed definite antagonism in the Cd and Pb uptake by the plants. Through the comparison of plant biomass and of the enrichment characteristics of Cd and Pd by roots and shoots, it was considered that relative to the other three test plants, sunflower could be selected as a potential candidate for the phytoextraction of soil Cd and Pb. Related Articles | Metrics | Comments（0）

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Effects of low temperature stress on physiological characteristics of six tree species seedlings. HE Yue-jun1,2;XUE Li1;REN Xiang-rong1;CAO He1; LIANG Li-li1;XU Yan1 cje    Abstract （2395）      PDF（pc） （874KB）（2148）       Knowledge map    Save With the seedlings of Dillenia turbinata, Peltophorum tonkinense, Garcinia oblongifolia, Alstonia scholaris, Khaya senegalensis and Ormosia pinnata as tested materials, this paper studied the effects of low temperature stress on their physiological characteristics. The results showed that under low temperature stress, the relative electrical conductivity of the seedlings had a slight increase. Except for P. tonkinense at 0 ℃, the free proline content in tested tree species seedlings treated with low temperature was higher than the control, but the soluble protein and chlorophyll contents fluctuated slightly. The MDA content in D. turbinate, G. oblongifolia and K. senegalensis seedlings increased with decreasing temperature, while that in other tree species seedlings changed slightly. Under low temperature stress, D. turbinata seedlings had a significantly higher SOD activity,P. tonkinense seedlings were in adverse, and the seedlings of other tree species changed slightly. Principal component analysis indicated that the cold resistance of tested tree species was in the order of O. pinnata>A. scholaris>K. senegalensis>G. oblongifolia>P. onkinense>D. turbinata. Related Articles | Metrics | Comments（0）