Table of Content

10 February 1984, Volume 3 Issue 01

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ECOLOGICAL AND PHYSIOLOGICAL CHARACTERISTICS OF MAIN DESERT PLANTS IN MINQIN DISTRICT OF GANSU PROVINCE

Zhang Yaojia

1984, (1):  1-4,54. 

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The ecological environment of this district is characterised by rare rainfall, drought, sweltering heat and fiequent sand drifting by wired. Desert plants are adapted to this environment with different ways. For instance, some species can stand drought and swelter by the high content of bound water, high viscosity and coagulation rate of protoplasm, and strong hydrophilic ability of colloid. And some species can do these through their morphological and anatomical characteristics. Therefore, it's profitable to take account of these characteristics in selecting sand-fixing plants.

A MODEL OF TRADITIONAL FARMING REFORMATION STARTED WITH AFFORESTATION AND GREEN MANURE PLANTING—AN ANALYSIS TOTHE AGRO-ECOSYSTEM OF QIANCHAGAN BRIGADE

Chen Shiping

1984, (1):  5-9. 

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The reformation of traditional farming has been started at Qianchagan brigade. The main points of it are: combining land utilization with soil conservation and fertilization, improving land surface covering by afforestation and green manure planting, and expanding sowing area for leguminous forage and green manure crops. Nutrient cyclings at three stages of agricultural production developement (stages of shifting cultivation, rotation with grain and green manure crops, and combination of farming and animal husbandry)are discussed in this paper.

NITROGEN FIXATION BY NODULES OF ALDER AND ECOLOGICAL CONDITION IN NATURAL FORESTS OF NORTHEASTERN CHINA

Yang Sihe, Huang Jiabin, Lin Jihui, Liu Huichang

1984, (1):  10-13. 

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Alnus mandshurica(Call.) Hand.-Mazz. and A. sibirica var. hisruta(Turez.) Koidz. are widely distributed in forest regions of northeastern China as major non-leguminous nodulated tree species with N₂-fixation. This paper summarizes the results of the research on effects of ecological factors on N₂-fixation of alder nodules. The results show that sufficient light condition is essential in raising N₂-fixing capability of the two species. The level of acetylene reduction of nodules partly depends on photosynthesis of the plant. The peak of diurnal course in acetylene reduction appears at 13: 00 hr. after the appearance of higher photosynthetic rate in early morning. The lower capability in N₂-fixation by A. mandshurica growing at high altitude is due to the lower temperature besides genetic factors.

A PRELIMINARY STUDY ON THE ROLE OF EICHHORANIA CRASSIPES AND SOME OTHER VASCULAR PLANTS IN PURIFYING HEAVY METAL-CONTAINING WASTE WATER

Qi Enshan, Liu Qisong, Yang Guifen, Zhang Chungui, Jiang Qingnan, Xu Lixin

1984, (1):  14-18. 

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In this paper, the purifying function and ecological effect of Eichorania crassipes and some other vascular plants in purifying Cd, Pb, As and Zn-containing waste Water and their resistant capability to Cd, Pb and As are discussed.

COMMUNITY DYNAMICS AND GEOGRAPHICAL DISTRIBUTION OF RODENTS IN ZHEJIANG PROVINCE

Zhuge Yang

1984, (1):  19-23. 

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This paper reported twenty-five species of rodents collected in Zhejiang. They belong to 7 families and 14 genera. The predominant species are from Muridae. Eight species are new recorded. Study shows that the species number is decreased with the increasing population density. The author comes to the conclusion that it is the ecological inequilibrium caused by human activities which led to these changes.

ECOLOGY OF CLADOCERA IN TIANJIN MUNICIPALITY

Li Mingde

1984, (1):  24-28,23. 

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The species and amounts of Cladocera in various water areas of Tianjin district, as well as the ecological distribution, components of species and quantitative variations of Cladocera in salty fresh water and polluted water areas are investigated and discussed by the author.

THE CONTENT AND NATURE OF AGRO-ECOLOGICAL ECONOMICS

Deng Honghai

1984, (1):  29-31. 

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This paper describes the content, nature, status and methodology of agro-ecological economics and stresses the application of systematic analyses to quantitatively study the economic efficiency and dynamic equilibrium of agro-ecological economic system.

ENERGY SOURCES AND SOILS

Chen Qingshuo

1984, (1):  32-35,62. 

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All biological energy sources are come from soils. Even such so-called fossil energy sources as coal and oil are also come from fossil soils.In our country, the main problem about energy sources is the fuel for daily use of peasants.It is necessary to work out a comprehensive plan for farmland construction including the establishment of fuel basis, and the popularization of using marsh gas.

RESTORE ECOLOGICAL EQUILIBRIUM AND CONSTRUCT QINLING-BASHAN MOUNTAINOUS REGIONS

Wang Guanglu

1984, (1):  36-38. 

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This paper discussed the characteristics of ecosystems in Qinling-Bashan mountainous regions, put forward some measures controlling the evolution of such ecosystems, and stressed the importance of afforestation and protection of natural ecological equilibrium.

ROLES OF SOIL MICROORGANISMS IN ENERGY-AND NUTRIENT FLOW

Duan Sunying

1984, (1):  39-42,64. 

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This paper discusses the relationships among microorganisms, microbial biomass and nutrient transformation in terrestrial soils. The examples given for carbon-, nitrogen-and phosphorus flow through ecosystems emphatically indicat the significance of living organisms and microbial biomass as well as its importance in various transformations involved.

AGRICULTURAL DIVISION AND ECOSYSTEM

Xian Xiaowei

1984, (1):  43-44,46. 

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Taking Gansu province as an example, this paper discusses the relationship between agricultural division and ecosystem and stresses the guiding role of the ideas on ecosystem and ecological equilibrium in the work of agricultural division.

UNDERSTANDING THE HARMFULNESS OF ECOLOGICAL IMIBALANCE FROM THE VICIOUS CIRCLE IN GUYUAN COUNTY

He Bingli

1984, (1):  45-46. 

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This paper describes the harmful effects of ecological imbalance in Guyuan county and puts forward some suggestions for restoring ecological equilibrium.