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    10 August 1996, Volume 15 Issue 04
    The Ecological and Biological Characteristics of Acacia mangium
    Ren Hai, Peng Shaolin, Yu Zuoyue
    1996, (4):  1-5,9. 
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    The biological and physiological characteristics, community structure and dynamic , biomaas and productivity, nutrient cycling of Acacia mangium were studied over 10 years at Heshan Station, Guangdong, China. The results showed that Acacia mangium was a quickly and widely adaptive species, and could be planted in tropical and lower-subtropical zone. Because of high photosynthesis rate and rational vertical structure, the productivity of Acacia mangium forest was high. The biomaas of the forest increased annually, but the annual growth of biomass and nodule biomass decreascd annually from the fourth year. This indicatad that N limited the growth of biomass. The nodule biomass and the amount of litterfall and nitrogen fixation of Acacia mangium forest were high. Quick cycling of the nutrient demts (especially N) in the forests proteced the soil and increaved the frtility in the soil.
    Analysis of Ecological Effects Under Different Cropping Patterns of Relay Cropping Cotton
    Sun Dunli, Ma Xinming, Yao Xianggao, Zhang Gensen, Wu Dafu
    1996, (4):  6-9. 
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    The results to the ecological effects under cotton field of five cropping patterns shown that before wheat harvested, soil temperature and light intensity in cotton field of relay cropping were lower than that of sole cropping cotton, and the sFDM cqucnce from low to high was 3:1<6: 2<4:2<3:2<sole cropping , while the soil water eentents under cotton field of relay cropping were higher than that in sole cropping. Durring flower and boll stage, light codition under 3 : 1 pattern was the best and in sole cropping was the worst. Consequently, numbers of boll per plant and the yield in 3 : 1 pattern were the highest, but the flowering rate in prc-frost was the lowest in the five cropping patterns.
    Soil Ecological Effects of Intercropping Forage Crops in Young Citrus Plantation and Its Influence on Growth of the Trees
    Wu jianjun, Li Quansheng, Yan Lijiao
    1996, (4):  10-14. 
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    In order to explore the soil ecological effects of intereropping winter forage crops in young citrus plantation and its influenee on growth of the trees, rye grass, Chinese milkvetch and mixture of the two were intercropped into newly planted citrus plantation in red soil on hilly area of central Zhejiang Province. The results showed that intercropping could enhance soil temperature during winter and effectively reduce soil and water erosion, which were very important to protect the trees from cold injury and the soil environment;however, intereropping would retard increase of soil temperature during spring and had some negative effects on growth of the trees during spring and summer; the influence of intereropping on soil fertility was not obvious during the two year experiment. When the technique of intereropping was to be extended in practice, euhivation and management measures of the intereropped citrus plantation must be strengthened and the relationship between utilization of the forage and the amount of biomass direetly returned to the soil should be well coordinated so that the integrated efficiency could be enhanced.
    Structure and Function of Microbial Ecosystem in Wastewater Treated by Water Driven Rotary Dishes
    Xu Huaxia, Zhang Chungui
    1996, (4):  15-18. 
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    The structure and function of microbial ecosystem in wastewater treated by water driven rotary dishes were studied. The results denoted that the structure of this eeosystem was a complex of microorganisms, including bacteria, fungi and actinomyces. The bacteria was a major component in the system. It possessed the deversity of the microorganism. The predominant microorganisms were preserved on the biological membrane of the biorotary dishes. The predominant groups of bacteria were belong to Bacillus, Arthrobaeter, Pseudomonas etc. Which had stronger purification ability to wastewater. When wastewater treated by water driven rotary dishes, the quality of draining off water basically reached the promised standard for industrial wastewater.
    The Effects of Two Forest Regeneration Methods on the Soils in the Subtropical Mountainous Region
    Wu Weidong
    1996, (4):  19-23. 
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    After having compared the effects of the two methods of reforestation, the non-burning afforestation and managed natural forest regeneration, on the soils following the forest regeneration with that of the traditional control burning afforestation, this paper indicated that the former two methods could maintain the litter and its containing nutrients on the forest soil surface, decline soil erosion, protect soil from regrassive development and texture abruptness, keep soil fertility, and avoid soil physical properties from deteriotation. This paper proposed that from the view of ecological protection and forestry sustaining development, attention should be paid to these two forest regeneration methods.
    Effect of Acid Deposition on Pinus massoniana in Tongling City
    Gao Jian, Chen Fangming, Chen Yaohua, Jing Chengiun
    1996, (4):  24-28. 
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    Tongling is a multiple-industry city, where has a serious acid deposition problem. The harm and effect of acid deposition to forest were studied in this paper. By experiment and stem analysis on Pinus massoniana, it was found that leaf area, percentage of green needles, pHvalue of leaf cells, and content of chlorophyllin in affected region were lower than that in cleaner region. The results also showed that acid deposition lowered the mean annual increment and current annual growth rate of diameter at breast height, tree height, and volume of the species. Studies revealed that acid deposition damaged photosynthesizer so that the growth rate of the species was reduced.
    Modelling the Dynamics of Root Distribution of Winter Wheat in Taihang Piedmont
    Zhang Xiying
    1996, (4):  29-32,69. 
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    Extensive investigation to root length and root weight at different growth stages of five winter wheat cultivars by taking soil cores under field condition in the piedmont of Taihang Mountain were carried out. Models were established to describe the dynamics of winter wheat root distribution along soil profile.
    A Primary Study of Bioeffeets of some Environment Conditions on Eichhornia erassipes
    Wang Guirong, Zhang Chunxing
    1996, (4):  33-36. 
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    The bioeffects of some environment conditions such as fertilization, alkalinity and precipitation on the productivity of Eichhornia crassipes were studied in this paper. The results showed that the increase regularity of plant heigth, blade width and biomass of Eichhornia crassipes related to fertilization was 3%>2%>1%, to alkalinity was pH7 >pH8 >pH9 >pH10, and to precipitation was 450mm>350mm. The variation of the strength of physiologic metabolism related to the environment conditions was similar to the plant heigth, blade width and biomass in the experiment.
    The Ecological Significance and Application of Landscape Connectivity
    Chen Liding, Fu Bojie
    1996, (4):  37-42,73. 
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    Landscape connectivity is a parameter which measures the ecological process by which the subpopulations of a landscape arc interconnected into a demographic functional unit. It is a landscape phenomenon which describes the relationships between landscape subunits. The landscape connectivity is different from the landscape connectedness which describes the characteristics of landscape pattern, the landscape connectivity mainly describes the function of landscape elements and their relationship, which can be measured by measuring the degree to which the landscape pattern facilitates or impedes movement among resource patches. The landscape connectivity is relative and abstract, which is changeable for different ecological process and studying objective. The emergence and application of connectivity in landscape study are very useful for biodivcrsity protection, biological resource management, landscape design and planning.
    Model and Advance in the Research of Cycling Regeneration of Tree Population
    Li Xuguang, He Weiming
    1996, (4):  43-46. 
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    The different opinions of cycling regeneration of tree population were introduced in this paper. Based on the theory of system, nature of the model and its advance of population age structure self-oscilla-tion were pointed out, meanwhile, the practical and theoritical significance of its research was analyzed.
    Equivalent Analysis and its Application in the Benefit Analysis of Ecological Farming
    Li Xiangge, Min Qingwen, Yang Zhi, Jiang Mengpeng
    1996, (4):  47-50,73. 
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    Based on the agroccological theory the , equivalent analysis was introduced and anew concept of nutrient and energy flow equivalent indices was given. And then the ecological and eeonomie benefits of a ecological farm were analysed by using the method.
    Benefit of CO2 Fixation by the Forests in Hebei Province
    Yang Yonghui, Bi Xudai
    1996, (4):  51-54. 
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    In order to study the effect of the forests in Hebei prov. on Ccycle and the indirect benefit of afforestation from CO2 fixation, the correlation betweenthe wood volume increment and the live biomass including foliage, branches, roots and non-tree biomassin forests was developed. Based on this correlation and data of wood volume increment, the area of the man-made forests, and increment of forest area, the amount of CO2 fixed by forest in Hebei Province was calculated. In addition, the transfer of C by forest logging, thinning and forest treatment and was analysed, and the loss of C from decomposition after forest logging was calculated. The total Cfixation of forests in Hebei Province amound to 13,545,185 ton of CO2. Based on calculation of the investment of afforestation for Cstorage, the annual benefits of forest from Csink equatetd to 3.405 billion RMB $.
    Diversities and Evolution of the Sclerphyllous Oaks in Tibet
    Li Junqing
    1996, (4):  55-58. 
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    According to a great number of literature, this paper synthesized and evaluated the recent results and issues on the morphorlogical and geographical variations, intra and inter species diversity, origin and evolution of the sclcrophyllous oaks. We proposed that the morphorlogical variation of the sclerophyllous oaks was the result of the adaptive effect to the local environmental conditions, and the genetic variation had close rilations with the geographical and climatic conditions. Based on the study of alloenzymes and cpDNA in Quercus ilex, we suggested a further research on the systematic relationship, phylogeny, and origin of sclerophyllous oaks by using molecular methods, so as to discuss the related Tibet plateau elevation, the evolutionary changes betwecnsclerophyllous oaks in Tibet and Ouercus ilex around Mediterranean basin, at the same research level to the European countries.
    A Sound Cycle and High Outputs of Feeding Fishes in Winter Paddy Field Ecosystem
    Zhu Zijun, Zheng Qinyu, Wang Guangming, Wei Qinghe
    1996, (4):  59-62. 
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    This paper described mainly types and relations of organisms in the paddy field ecosystem, and discussed principles and technical norms of rice and fishes co-existence in the ecosystem. The results could provide theoretical basis for feeding fishes in the paddy field.
    Relationship between Seasonal Variation of Soil Enzymatic Activities in Wheat Field and Environmental Factors in Northeast Heavy Frigid Region of China
    Gou Yingbo, Su Yongchun, Zhang Chongbang, Pan lin, Zhang Xiujuan
    1996, (4):  63-65. 
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    This study was made from April to September in 1993.The relationships between seasonal quantitative variation of soil cellulase, urease, invertase, eatalase, dehydrogenase activities and 8 environmental factors were studied, and the primary and secondary factors influencing enzymatic activities were sought out through grey connected analysis.
    An Ordination Technique Based on Classification
    Zhang Jintun
    1996, (4):  66-69. 
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    Asimple ordination technique based on classification results and matrix multiplication was introduced. It Was used to analyze the grassland data in Hopsten, Northwest Germany and its outcome was compared with that of detrended correspondence analysis(DCA) in this paper. The results suggested that it was a successive and effective ordination method, and was casier in interpretation.
    Extraction of 1,2,4-trichlorobenzene from Water, Soil and Plant Tissue and Its Analysis on Gas Chromatography
    Zhang Hairong, Ou Ziqing, Ren Liping, Zhang Yan, He Yaowu
    1996, (4):  70-73. 
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    Ultrasonic extraction was used in the study on the analysis of 1,2,4-trichlorobenzene. In the study, 1,2,4-TCB in water samples was extracted with n-hexane whereas that in soil and plant, with mixture of n-hexanc and acetone at 9: 1. In all experiment, extractant of 15-25ml and an extraction time of 2h were performed. The recoveries of 1,2,4-trichlorobenzene from water, soil and plant (tissue stem and foliage of alfalfa and rice grain) were found to be more than 85%, 65% and 62%, respectively. The method was simple, sensitive and reliable for the analysis of 1,2,4-TCB, which is a volatile chemical, with low reagent demand, and applicable in the analysis of other chlorobenzenes in environment.
    Several Inlaid Cultivation Models for Agroforestry
    Yu yishu, Qian Tenq
    1996, (4):  74-78. 
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    Agroforestry can be classified as "Inlaid Type"and "Space Type". This paper focused on introducing several relatively proper Inlaid cultivation models designed in Anhui Province and describing in detail the tree characteristics, usefulness and suitable conditions for growth and designing methods in these models. Under the present circumstances that trees are unallowed to be planted in farmland, the application range and value of inlaid cultivation models might be greater than those of space ones.