Chinese Journal of Ecology

Slope Protection by Economic Organisms in Coastal Areas of Jiangsu Province-A Model Study

Jiang zhanzheng, Huang Chunbai

1992, (6): 1-5.

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Reveting is an important problem in coastal reclamation region. This paper presents the research on biological revetment by planting various kinds of fruit trees. The optimum method of biological revetment is obtained by analyzing the effectiveness for slope protection and economic benefits of various trees and by integrated scoring method. Planting fruit trees on river bank slopes can not only conserve water and soil,but also open up a new way for increasing rural economic income.

Ecological Effect of Chinese Fir Shelterbelt in tea Plantations

Fang Fuyu, Chert Liangfu, Li Jianzhong

1992, (6): 6-10.

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A new type of ecological community is established by interplanting Chinese fir (Cunninghamia lanceolata) shelterbelt in tea plantations on mountainous lands. Through investigation and analysis on various parameters about tea tree, Chinese fir, soil and atmosphere, the results indicate that this kind of community can improve ecological environment in tea plantations and quality of tea-leaves, and raise per unit yield of tea. It is a new way for establishing better ecological tea plantations on mountainous lands of southern China, with tea trees as the main body and Chinese fir as protective shield and with combined development of tea and Chinese fir.

Ecological Distribution of Filamentous Fungi in Forest Soils of Guangxi

Hu Chengbiao, Wei Yuanlian, Zhu Hongguang

1992, (6): 11-16.

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Studies on ecological distribution of filamentous fungi in forest soils of Guangxi indicate: 1. the quantity of filamentous fungi is closely related with forest type,soil moisture and soil organic matter content,which is greater under coniferous than under broadleaved forest,and greater in soils with higher moisture and organic matter contents;2.Peniclilum,Trichoderma, Aspergillus,Humicola and Phoma are dominant and the first two genera have the greatest relative density.

Ecological Factors and Licorice Quality

Lin Souquan, Lin Lin

1992, (6): 17-20.

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Based on investigation on growing environment and distribution regions of licorice,the medicinal quality of licorice in different habitats is compared from morphological,histological and phytochemical aspects.The relationships between its medicinal quality and climatic, soil and other ecological factors are preliminarily analyzed,which helps us have a better understanding on its growth habits and ecological requirements, and provide a scientific basis for its introduction and cultivation.

Structure and Diversity of Spider Community in Wheat-Corn Rotation Field

Cong Jianguo

1992, (6): 21-24.

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Spider communities are investigated in five habitats of wheat-corn rotational fields.Some basic features of their structure,including composition,diversity,similarity and quantitative dynamics are reported in the paper.

Agroecological Effects of Rape Crops in Mountainous Areas of Western Sichuan Basin

Li Hongquan, Zeng shoulu

1992, (6): 25-28,33.

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Based on climatic and agricultural data and with Kassam's method of agroecological divisioning, the potential productivity of rape crops at different ecological zones in mountainous regions of western Sichuan Basin are calculated. Integrated regression equations of light, temperature, water and rape yield are computerized, and affected coefficients of ecological factors on rape yield are calculated. It shows that the potential productivity of rape crops in these regions is 2.7-4.0 times higher than practical yield, and the affected coefficients of temperature and precipitation are significant. Low temperature and cloudy and rainy weather in early spring are also important limiting factors to rape yield. Measures for popularizing intermediate and late mature fine breeds of rape crops are put forward and have been verified by practical truth.

Compositions of Forest Vegetation and Insect Fauna in Heihe River Basin Covering Border Area of Qinghai and Gansu Provinces

Fu Huien, Zhang You, Huang Fusheng

1992, (6): 29-33.

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The vegetations in Heihe River basin are divided into five zones:grassland desert zone, mountain grassland zone,mountain forest grassland zone,subalpine scrubby grassland zone and sparse alpine subcryophyte zone.Forest insects in this basin belong to 136 species,50 families and 6 orders.Occurrence features of main forest insect pests and their rampant causes are analyzed and measures for their control are put forward.

Patchiness and Patch Dynamics: Ⅲ Ecological and Evolutionary Consequences

Wu Yegang, Wu Jianguo, Li Bailian

1992, (6): 34-41,73.

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The authors suggest that pathiness can be represented on different hierarchical levels of ecological systems.It's considered that metapopulations result from patchiness and spatial distribution of resources is one of the strong factors shaping the population dynamics. There may be threshold effects of patchiness on energy balance and species survival. Disturbance results in patchiness and influences resource availability and distribution.In turn, patchiness may limit or prevail a disturbance.The interaction of patchiness and disturbance may result in a metastability. Human disturbance is considered as an event usually on a large spatial scale in a short time period. Ecological systems may not be able to keep up such rapid changes and vicious positive feedback may be invoked.In view of evolution,patchiness is a consequence of co-evolution of biotic and abiotic entities in nature,Biodiversity is, therefore,the fact and the result of patchiness.

Root Exudates and Their Ecological Roles

Wu Hui, Zheng Shizhang

1992, (6): 42-47,78.

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This paper reviews the terminology of root exudates,mechanisms of their exudation,factors influencing the exudation,mediated metabolic and non-metabolic pathways,procedures for their collecting and analyzing,substances detected in them, relationships between root exudates and rhizosphere microbes and ecological roles of root exudates.

Preliminary Account on “Ecological Product”

Ren Yaowu, Yuan Guobao

1992, (6): 48-50.

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This paper is the first to introduce the conception "Ecological Products". The profound significances of ecological product exploitation are accounted from three aspects, and four practical suggestions are put forward for the development of ecological products.

Ecological Impacts of Acid Rain and tts Prevention Countermeasures

Du Yuguo, Shan Yunfeng

1992, (6): 51-54,57.

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Some new ideas about the impacts of acid rain on terrestrial ecosystem, aquatic ecosystem, human body, constructions and materials are introduced in the paper. Operational strategies and technologies for its prevention are also discussed.

Seasonal Dynamics of Aboveground Biomass of Medicago sativa Artificial Grassland at Yanchi of Ningxia

Li Fengmin

1992, (6): 55-57.

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Regression analysis on Medicago sativa Population biomass and relative growth rate(RGR) versus environmental elements are made, and several regression equations are obtained. Through analysis of regression equations and local environmental conditions, it is believed that harvesting the aboveground biomass of Medicago sativa once in late July and letting it continuous growing, it will be beneficial to the increase of productivity and the maintenance of water balance of the artificial grassland.

Ecological Conditions and Fish Communities in Dafengkou Reservoir and Shihe River

Xie Yuhao, Li Bo, Liu Yixin

1992, (6): 58-61.

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This paper presents the research results on ecological conditions and fish communities in Dafengkou Reservoir and Shihe River conducted in 1987-1989, which include natural environments of reservoir and river, physical and chemical properties of the water, status of aquatic organisms, fish composition, density of fish community, species diversity indices of fish and its dominance indices in reservoir and various sections of the river.

Worries About Water Resources

Huang Yongsong, Wang Mingmei

1992, (6): 62-66.

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Using large amounts of reference materials, this paper introduces the present situation of water resources in the world and especially in China, brings to light the pollution and shortage of water resources due to irrational exploitation and problems arising from serious worsening natural ecoenvironment. It also calls for a comprehensive management and protection of water resources.

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