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    10 December 1995, Volume 14 Issue 06
    Impacts of Shifosi Reservoir on Its Adjacent Ecological Environment
    Pei Tiefan, Fan Shixiang, Han Shaowen, Chi Zhenwen, Wang Jiancheng
    1995, (6):  1-6. 
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    Shifosi reservoir is one of the water transferring projects from north to south in northeastern China. Exactly estimating the effects of the reservoir on its adjacent ecological environment is the bases for feasibility analysis of the water transferring project.Therefore, a lot of hydrological,meteorological and vegetational data have been collected and investigated.With the principles of hydrology and meteorology and by means of Chinese and foreign reports on water transferring,the prediction of the effects of Shifosi reservoir on hydrological,meteorological and vegetational conditions around it was made through analysis and calculation in the paper.
    Ecological Classification of Coal Gangue Hills in Semi-Arid Regions
    Zhang Jun, Yang Fang, Lin Hua
    1995, (6):  7-10. 
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    Through investigation on ecological conditions of coal gangue hills in Fuxin,main factors thataffect on plant succession and reclamation were found out, they were years of stopping heap,depth of surface weathering gangue and coverage of vegetation. According to those factorsgangue hills could be divided into four ecological types,In each type Amorpha fruticosa wasplanted. Observation of tree growth in different types demonstrated that this classification wasreliable and useful for the selection of species and method of planting for the reclamation.
    Ecological Effects and Economic Bencfit of the Complex Agro-Forestry Systems in Low-Hill and Red Soil Areas
    Fu Qinglin, Luo Yongjin, Chai Xizhou
    1995, (6):  11-15. 
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    Several complex agro-forestry systems were established in low-hill and red soil areas. Analysis oftheir ecological and economic benefits showed(1)the complex agro-forestry systems improvemicro-climate,quality of agricultural products and soil fertility;(2)the economic benefit ofcomplex agro-forestry systems is higher than that of single agricultural systems.
    Soil Enzymatic Activity in the Subtropical Rain Forest in Hexi, Fujian
    Zheng Wenjiao, Wang Liangmu, Lin Peng
    1995, (6):  16-20. 
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    The paper deals with the activities and dynamics of four hydrolases and two oxido-reductases in the floor of the subtropical rain forest in Hexi, Fujian province. The hydrodase activities of invertase, protease,urease and acid-phosphatase were 5.08 13.24mg glucose/g dry soil. 37℃. 24h,0.18 0.28mg NH2-N/g dry soil.30℃. 24h,0.25 0.37mg NH3-N/g dry soil.37℃. 24h and 0.80 1.51mg phenol/g dry soil. 37℃. 24h respectively, with higher intensity during May-August.The oxido-reductase activities of polyphenol oxidase and catalase were 1.81 3.31ml 0.01NI2/g dry soil.2min and 12.50 21.89ml 0.1N KMnO4/g dry woil.20min respectively,with higher intensity during January-March and September(or October)-December. The fluctuation of enzyme activity was in order of invertase>acid-phosphatase>polyphenol oxidase>catalase>protease>urease,There was significant negative correlation between seasonal dynamics of hydrolase activity and oxido-reductase activity. The activities of four hydrolases were significantly and positively correlated with the quantity of fungi and bacteria(except acid-phosphatase), monthly mean temperature,monthly rainfall(except invertase),and total phosphorus in soil.The activities of two oxido-reductases were significantly and positively correlated with organic matter in soil.
    Study on Regulating Food Chains in Bamboo Forest Ecosystem
    Li Changrong, Tu Liubang, Wu Jilin, Wang Jinrong, Huang Wenpei
    1995, (6):  21-24,28. 
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    The paper expounded the composition and structure of food chains,material flux and output and important characteristics of the detritus food chain in bamboo forest ecosystem. A new food chain was built up by inoculating the decomposer(Dictyophora)in bamboo forest as a consumer,whose net-secondary productivity amount to 0. 714t.ha-1-1. It is a natural decomposer which can speed up the decomposition of stumps and other litherfalls in bamboo forest and is favourable to the growth of bamboo plants. Through the new food chain,the economic benefits of bamboo breast could increase about ten times than before.
    Relative Fatness of Brand's Vole(Rattus norvegicus)
    Yang Zaixue, Guo Shiping
    1995, (6):  25-28. 
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    The relative fatness of brand's voles was calculated by empirical formula. The results indicatedthat relative fatness becomes less as the age grows.There were no significant sexual differenceswith respect to relative fatness,But seasonally it was high in spring and decreased in summer,then the highest in autumn and decreased in winter. Variations of relative fatness were closelycorrelated with population density and breeding.
    Effects of Alternative Drying-Rewetting and Freezing-Thawing on soil Fertility and Ecological Environment
    Piao Hechun, Liu Guangshen, Hong Yetang
    1995, (6):  29-34. 
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    The abiotic stress of alternative drying-rewetting and freezing-thawing and its effects on soil weremeasured.The results showed that a series of complex physical, chemical and biological changesin soil took place under the abiotic stress, which significantly affected on nutrient cycling in soil. The abiotic stress plays an important role in ecological succession in the areas where the stressfrequently acted on soil.
    Modular Theory in Plant Population Ecology
    Li Yunxiang, Liu Yucheng, Zhong Zhangcheng
    1995, (6):  35-41. 
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    The historical background of modular theory in plant population ecology and its main ideas were reviewed.The several related terms,including modukr and unitary organism, medule,genet,and metapopulation were interpreted.It was suggested that different levels of modular units could be selected for study according to the characteristics of species and the aim of studies.The advantages of applying modular theory in plant population research were also discussed.
    Structure and Dynamics of Seeds Banks in Soil
    Ban Yong
    1995, (6):  42-47. 
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    The importance of the seed bank in soil can be understood by discussion about the seeds'numberand dynamics from dispersal input to output through germination ,predation and death.The seedbank partly reflects the history of the communities and can play an important role in therestoration of degraded land.So,the composition and size structures of soil seed bank werediscussed in the paper,Meanwhile,the effects of many factors,which are successional series, masting,size and age of seed, physical environment,disturbance,buriedseed depth,togetherwith some biological factors, on dynamics of the seed bank.At last,more attentions were paid tothe relationships between animals(dispersal and predation)and seed bank due to their increasing importance.
    Population Dispersion of Cattle Egret
    Wen Zhenzhong
    1995, (6):  54-56,73. 
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    Based on a vast amount of literature and the author's researches,the main causes for the gradualdispersion of cattle egret population around the world and its relations with trophic differentiation are analysed and summarized in the paper.
    Research Activity and Situation of Computer Modelling and System Analysis in Cropping System in China and Aboard
    Yang Jingping
    1995, (6):  57-62. 
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    Cropping system modelling is a new field in crop production researches, This paper discussedabout the module structure,function,existing problems and application prospective of croppingsystem modelling.
    Effects of Ecological Conditions Cotton Yield in Hebei Low Plain
    Wang Youzeng, Chen Fengrui
    1995, (6):  63-65,77. 
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    The suitable ecological conditions are greatly advantageous for cotton production in Hebei Low Plain. Precipitation is one of important factors effective on cotton growth.Generally,lint yields are higher in drought years than in humid years. Different management measures should be taken in different rainfall years. The key to high and stable yields is to establish a proper population structure and to maintain fine eco-environment in cotton fields.
    Ecological Observation of Elaphe anomala
    Zhou Yufeng
    1995, (6):  66-68. 
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    Elaphe anomala had been considered as a sub-species of Elaphe schrenckii. Based on Ji Daming'sresearch for years, it should be defined as a independent species and named as Elaphe anomala.The morphological characters and living habits of Elaphe anomala are reported in detail in the paper.
    An Approach to A Method of Urban Ecosystem Simulation
    L? Yonglong
    1995, (6):  69-73. 
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    An urban ecosystem is a kind of large-scale complex system. Because of its multi-level complicaterelations,dynamic features and long time-delay characteristics,no perfect method can simulateits whole development process accurately. In this paper,a man-computer interactive simulationmethod of urban ecosystem is presented based on comprehensive analysis of the existingsimulation methods. According to the new method,the problems,processes and policies of anurban ecosystem can be simulated by choosing suitable models.
    Ecological Impacts of Roads and Its Ecological Construction
    Zhang Jiaen, Xu Qi
    1995, (6):  74-77. 
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    Road-building has many ecological influences on its neighbouring areas, including corridor effect,micro-climatic effect,breadth effect and urbanization effect.Road transportation also can bringabout ecological damage and environment pollution around it.Therefore,ecological constructionof roads should be considered and conducted.