Table of Content

10 February 1992, Volume 11 Issue 01

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Achievement and Perspective of Plant Population Ecology Research in China

Zhong Zhangcheng

1992, (1):  4-8. 

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This paper introduces the researches in fields of plant population structure, seed population, ecological strategies, population interference and population genetics in China. At the same time, it shows the achievements and perspectives of plant population ecology in the country.

Progress in Animal Population Ecology

Pang Xiongfei

1992, (1):  9-14. 

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Animal population ecology is the most active field in animal ecology. This paper reviews the foundation and development of animal population ecology and its achievements in absorbing modern system science. The developmental trends of population ecology in modern time are discussed, with population system researches as the focus.

Landscape Ecology and Global Ecology in the Last Decade in China

Chen Changdu

1992, (1):  15-16,8. 

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The initiative, development and aceivements during the last decade of landscape ecology and global ecology researches in China are comprehensively described and summarized in the paper.

Composition and Storage of Fallen Trees and Snags in Korean Pine-Deciduous Mixed Forest at Changbai Mountain

Chen Hua, Xu Zhenbang

1992, (1):  17-22. 

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The composition, biomass and nutrient storage of fallen trees and snags are surveyed in major forest types of Korean pine-deciduous mixed forest at Changbai Mountain Natural Reserve. The amount and biomass of fallen trees and snags range from 82 logs穐a^-1,5 snags穐a^-1 and 7.9t穐a^-1, 1.71t穐a^-1 in Korean pine-broadleaved forest to 94 logs穐a^-1,20 snags穐a^-1 and 16.23t穐a^-1, 7.34t穐a^-1 in broadleaved-Korean pine forest. Fallen tree and snag compositions in these two forest types are respectively similar to their stand compositions. Fallen trees and snags are important nutrient pools in Korean pine-deciduous mixed forest, especially for their 28.96 and 43.27 kg穐a^-1 storage of Nitrogen. They are a part of forest detritus that should be included in forest detritus survey and be well reserved in forest land after forest cutting.

Relationships Between Simulated Acid Rain, Soil Acidification and Root Growth of Chinese Fir and Schima superba

Liao Liping, Chen Chuying

1992, (1):  23-28. 

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(1) Simulated acid rain accelerates the leaching of Ca²⁺,Mg²⁺ cations in pot soils and leads to soil acidif ication.The more intense the soil acidity is,the more aluminum will be percolated. (2) When the pHof soil and acid rain is equal to or larger than 3.0, no significant influence can be observed on the root biomass and root growth of one-year-old Chinese fir and S.superba, whereas a pH_2.0 acid rain can significantly prohibite the root growth of Chinese fir, especially for fine roots. At the same time, S.superba is less obviously affected. (3) When the content of soil active aluminum reaches to 30.2mg?100g soil)^-1, and Al/Ca ratio to 4.9, the root growth of one-year-old Chinese fir is seriously inhibited.As for one-year-old S.superba, these parameters are 40.6mg?100 g soil)^-1 and 15.8 respectively. (4) S.superba possesses higher resistence to acid rain and soil acidification than Chinese fir.

Modelling Analysis for Protein's Population Carrying Capacity in Agroecosystems of Miyun, Beijing

Hu Chunsheng, Han Chunru

1992, (1):  29-31. 

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The protein productivity and population carrying capacity of various forms of agroecosys tems in Miyun, Beijing are simulated with compartment-matrix models. Effective measures are proposed to combine animal husbandry and farming for the improvement of diets and system's population carrying capacity.

Ecological Effect of Litters Under Chinese Pine-Chinese Arborvitae Mixed Forests and Their Pure Stands

Qi Xinshan

1992, (1):  32-37,47. 

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Sampling plot researches revealed significant effect of forest litter on soil fertility, soil conservation,water regulation and soil temperature and humidity. It is also found that when Chinese arborvitae is property mixed with Chinese pine, it can remedy the defects of pure stands and improve the overall ecological benefits.Therefore Chinese pine and Chinese arborvitae mixed forests are considered to be widely prospective in mountainous areas end their litters should be strongly preserved.

A Preliminary Account on Biological Clock of Marine Invertebrates

Zheng Zhong

1992, (1):  38-40. 

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The biological clock in marine invertebrates,with special reference to Crustacea, is accounted in two aspects: namely, rhythm and mechanism. The former sonsists of three topics, i.e., tidal thythm, lunar rhythm and diurnal rhythm, and the latter deals mainly with metabolism and hormone, taking chromatophorotropic hormone secreted by Sinus and X glands inside the eye-stalk of schrimps and crabs as an example, which is responsible for the diurnal color change in Crustacea. It is considered that in future research , more attentions should be paid to the important role of hormones in timing mechanism and in the control and regulation of physiological rhythms of biological clock.

Fire and Its Roles in Ecosystem

Gao Wei

1992, (1):  41-47. 

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This paper describs kinds of fire, its effect on various components of ecosystem, adaptive characteristics of plant species to it, dependence of ecosystem on it and its role in the management and maintainence of ecosystem. It is considered that, as an important environmental factor in the evolution of various species of many ratural ecosystems on the earth, fire plays an important part in maintaining naturally functioning ecosystems and in helping to determine the structure and distribution of many of the world's plant and animal communities. To preserve an ecosystem, it is necessary to preserve all ecological processes under which that ecosystem evolved, including periodic big fires.

Research Advances in Plant Epiphytic Microorganisms and Biological Control of Foliar Diseases

Shan Weixing

1992, (1):  48-53,74. 

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Recent advances in the fields of plant foliar microbial ecology and biological control of foliar plant diseases are briefly reviewed, with special references to the features of foliar habitats, characteristics of three pathogen groups, selection of antagonists and strategies in biological control of foliar plant diseases and its improvements.

Preliminary Study on EcologiCal Energetics of Crocidura lasiura

Wu Huaqian, Zhu Longbiao

1992, (1):  54-56,74. 

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Through measuring the oxygen consumption and energy budget of Crocidura lasiura in summer and winter, following results are obtained: 1.The oxygen consumption of C.lasiura is lower in winter than in summer under the same temperature controlled in lab.,but under natural ambient temperature, the oxygen consumption of C.lasiura is significantly higher in winter than in summer (p<0.01). 2. The food intake of C.lasiura is higher in winter than in summer, and the energy intake in winter and in summer corrected by W^0.75 are significantly different (p<0.05). 3. Both the digest efficiency and assimilation efficiency are lower in winter than in summer, with significant differences between these two seasons (p<0.05).

Influence of Acidic Leaching on Ca/Al Ratio in Solution of Lateritic Red Earth

Liu Hongjie

1992, (1):  57-59. 

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In the leaching process, the concentration or caicium declines, but no remarkable difference has been found with different acid rains. As for the concentration of alumunium, there is no distinct change after leaching with acid rain of pH>3.0, but it's markedly increased after acidic leaching of pH2.5 Consequently, the declination of Ca/Al ratio is the result of leaching process when the pH of acid rain is atove 3.0. Only when pH<2.5, the leaching of acid rain starts to reduce this ratio. The declination speed becomes slower with the intensification of leaching.

Roles of Ecology in Progress of Modern Science

Chen Qingsuo

1992, (1):  60-62. 

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The roles and functions of ecology in the progress of modern science are described. As pointed out in the paper, ecology in modern time has developed into a science to view the world from human angles, which has great influences on the progress of modern science. Considering from the social functions of science, ecology will play a more significant role, instead of saying that biology represents the developmental trend of modern science.

Integrated Harness of Water Yield Reduction in LiJiang River Basin of Guilin, Guangxi

Deng Sizhong

1992, (1):  63-66. 

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Serious situations and impacts of water yield reduction in Lijiang River basin are illustrated, according to investigations at the upper reaches of the river basin and in Guilin city. Based on long-term forest hydrological research, it is fully expounded that water yield reduction is induced with severe deforestation. From the strategical point of view, it poses ten comprehensive approaches, which are of significance in both theory and urban ecological construction.

Causes of Flood Catastrophes and Suggestions for Their Comprehensive Harness

Chen Binghao

1992, (1):  67-68. 

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Natural and artificial factors intensifing flood catastrophes in the middle and lower reaches of the Changjiang River are analysed.Comprehensive measures are suggested for their effective harness.