Table of Content

10 December 1991, Volume 10 Issue 06

Previous Issue    Next Issue

Distribution Pattern of Dominant Tree Populations in Carpinus pubescens community in Qianling Mountain

Liang Shichu

1991, (6):  1-5. 

Asbtract ( 1296 )   PDF (473KB) ( 223 )  

A variety of methods has been used to analyse the distribution pattern type, aggregative intensity, pattern scale and dynamics of dominant tree populations in Carpinus pubescenscommunity in Qianling Mountain.The results indicate that most of populations show an aggregated distribution in their dispersal and developmental stages, and tend to be randomly distributed during their maturing and degenerative stages. The aggregated intensity and pattern scale vary among different populations in a community and among same population in different communities.

Determination and Comparison of Plant Species Interconnections in Three Types of Grassland

Li Yuzhong

1991, (6):  6-10. 

Asbtract ( 1305 )   PDF (482KB) ( 231 )  

The approach of space-for-time substitution is used to determine the plant species interconnections in different successional stages of Aneurolepidium chinense grassland in Inner Mongolia. The artificial, degenerated and natural grassland of Aneurotepidium chinense respectively represent the primary stage, mid-stage and climax of the succession process. Plant species interconnections are shown to be the most significant in its primary stage, then the midstage, and the most insignificant in climax stage.The fluctuations of interconnection among some species are also analysed.

Quantitative Analysis on Relationship Between Susceptability of Wheat Breeds and Epidemics of Stripe Rust(Puccinia striformis)

Chen Wanquan, Xie Shuixian, Chen Yanglin

1991, (6):  11-15. 

Asbtract ( 1241 )   PDF (433KB) ( 163 )  

As the results indicate, the developmental scale and speed of Stripe rust charges with different susceptability of wheat breeds. The epidemic curves on various wheat breeds arc best fitted by Gompertz model. According to the value of epidemic rate(k)in the model, the 8 breeds are classified into 3 susceptability levels,i.e. Highly(k≥0.1), medium(0.06<k<0.10)and least susceptable(k≤0.06). Approaches concerning the prevention of Stripe rust epidemics in susceptable areas of southern Gansu province are discussed in the paper.

Ecological Features of Moschus moschiferus in Pangquangou Natural Reserve

Hao Yinghong, Wu Jianyong, Wang Juntian, Wang Jianping

1991, (6):  16-18,29. 

Asbtract ( 1258 )   PDF (390KB) ( 180 )  

Ecological researches were carried out during 1982—1987 on Moschus moschiferus in Pangquangou natural reserve of Shanxi province.Research items include habitat characteristics,quantitative distribution map, population density, declination rate of quantity, breeding and feeding of Moschus moschiferus. Effective measures for its protection are also presented.

Ecological Study on Tea Plant in Hilly Regions

Duan Jianzhen, Guo Suying

1991, (6):  19-23,29. 

Asbtract ( 1357 )   PDF (607KB) ( 307 )  

The yield and quality of tea are greatly affected by temperature in spring and water supply in summer and fall. The interrelations between air temperature, earth temperature,water supply, solar radiation and the growth of new shoots are analysed in detail. The high air temperature and solar radiation in summer and fall are unfavorable for the growth of tea plant, and significant improvement of the yield and amino acid content of tea can be obtained through 35—45% shading. Water and soil erosion is also an important factor in tea production of hilly regions.Shelterbelt or shading trees and other soil and water conservation measures arc highly recommended for tea plantations of the hilly regions.

Chemical Properties of Litter Layer Under Major Coniferous Forests in Northern China

Jin Xiaoqi

1991, (6):  24-29. 

Asbtract ( 1291 )   PDF (483KB) ( 124 )  

The chemical properties of litter layer under major coniferous forests in Northern China are studied. The results have been shown as follows.(1)significant difference has been found between chemical properties of L layer and F layer. Various mineral elements and coarse protein tend to be accumulated in F layer.(2)the content of inorganic, organic substances in litter layer and their properties vary significantly with different tree species.(3)the decomposition rate of litter is generally lower under coniferous forests. Large amount of nutrients, coarse protein and cellulose are detained in F layer.(4)within stands investigated, the hig hest decomposition rate of litter appears under Platycladus orientalis forest, and the lowest one appears under Picea wilsonii forest.

Diurnal Course of Photosynthesis of Korean Pine

Wen Shiyun, Yang Sihc, Yin Zhongfu

1991, (6):  30-33. 

Asbtract ( 3915 )   PDF (426KB) ( 241 )  

The diurnal course of net photosynthesis of Korean pine and related environmental factors are measured in situ, using an improved gas exchange system. An introduction is also given for the improved measurement device and the technique of boundary-line analysis for analysing data. The diurnal course of photosynthesis is shown to be dependent largely on weather conditions, such as light, temperature and relative air humidity, Boundary-line analysis for the response of photosynthesis to light indicate that, the photosynthetic rate of Korean pine is 6.27μmol·100g^-1·s^-1: light saturation point is 800μE·m^-2·s^-1, and when effective radiation is below 800μE·m^-2·s^-1, light becomes a limiting factor for photosynthesis. The depression of photosynthesis at midday is mainly caused by high air temperature and low relative humidity.

Marine Biochemical Genecoloqy——A New Research Field of Marine Ecology

Wang Guizhong, Li Shaoqing

1991, (6):  34-38. 

Asbtract ( 1226 )   PDF (634KB) ( 161 )  

A brief review is given on marine biochemical genecology, which is a new research field developed from marine ecology.This paper emphasizes on its subjects, such as the relationship between functional diference of homologous forms of enzyme or protein and the adaptation of animals to their environment, the gradual variability of protein loci,the research of population structure in terms of biochemical genetics, the relationship between genetic variation and environmental factors. The nature and developmental process of ecological genetics, the biochemical methods measuring genetic variation are also briefly described.

Ecological Field Theory——the “Growing Point” of Physical Ecology

Wang Deli

1991, (6):  39-43,61. 

Asbtract ( 1158 )   PDF (589KB) ( 217 )  

As one of the key problems in ecology, interaction is presented in two aspects:(1)the action of organisms on their environment,(2)the reaction of environment(including ncighborer organisms)to the original organisms. The ecological field theory introduced by Hsin-I Wu, Sharpe and Walker, is dealing with the integrated quantitative analysis of these interaction processes, in an attempt to reveal their eco-physiological mechanism. The formation background, definition, basic contents and significance of the ecological field theory are described in this paper.

Analysis of Nitrogen Production in Ecological Household Farm

Wang Huizhu, Yang Ping, Liao Baohua, Wu Yanlong

1991, (6):  44-48. 

Asbtract ( 1271 )   PDF (517KB) ( 172 )  

Characteristics of N input,output and translocation are studied using system analysis for an ecological household farm suffering severe sand erosion.Taking advantages of topographic gathering of nutrients and selecting low-flat land to establish"little oasis"using intensively cultivated crops and high-yield forage woods is demenstrated as a break through for the agricultural development of these regions. The steady support from farming,grassland grazing in summer and enclosed breeding with dry fodder of weed and tree leaves are the three guaranties for the success of animal husbandry characterized by Tan sheep.

Developing Ecological Fishery and Preserving Aquatic Environment—A Preliminary Research on the Aquatic Ecological Agriculture in Zhuhu Lake

Zhang Jiayu, Feng Huifang

1991, (6):  49-52. 

Asbtract ( 1240 )   PDF (387KB) ( 147 )  

This paper explored and discussed tome problems concerning the rational use of aquatic natural resources,conservation of aquatic eco-environment and development of ecological fishery.Through three years' eco-agricultural experiment in Zhuhu fishery farm, some data and facts are accumulated,which fundamentally prove that the "planting-brccding-mcthanc"model can effectively improve the rural eco-environment and the development of fishery. Develeping "esological fishery" is suitable for national situations, being an efficient way for the scientific and technological development of aquatic agriculture.

Ecological Crisis in Southwest China

Yang Minghua, Chen Dingmao, Gao Lin, Liu Caoxi, Pu Hanxi, Wang Xu

1991, (6):  53-57. 

Asbtract ( 1242 )   PDF (515KB) ( 187 )  

According to an integrated survey in southwest China, this region is facing a series of ecological crisis such as rapid population growth, land reduction, forest ecosystem degeneration, severe soil and water erosion, acid rain, air and water resource pollution, more frequent natural disasters and deterioration of ecological environment. The causes of ecological crisis in southwest China and its effects on local economy, human health and regional development are analysed.This paper aims to perspect ecological environmental problems facing China today through analysing ecological crisis in its southwest part.

Vertical Distribution and Seasonal Dynamics of Oribatid Mite in Soil Fauna

Wang Yifang, Zhu Wen, Chen Guoding

1991, (6):  58-61. 

Asbtract ( 1229 )   PDF (357KB) ( 120 )  

(1)The vertical distribution of Oribatid mite in soil fauna on the foot of the Purple Mountain in Nanjing is aggregated to surface layer of soil.(2)The vertical distribution of this species varies seasonally, with strong surface aggregation in Jun.—May and relatively weak aggregation in June—Dec.(3)Its average density of distribution is higher in Dec.—Feb.,and lower in June-Aug. Relationships between temperature, humidity and food source and the density of Oribated mite have been found.

Density Monitoring of Common Residential Flies in Yaan, Sichuan Province

Feng Yan, Li Guangshi, Shi Ping, Yang Shibin

1991, (6):  62-66. 

Asbtract ( 1212 )   PDF (435KB) ( 143 )  

In general residential area, there is only one species of fly(Musca aomestica). But m residences located in agricultual free market, 7 species are found, dominated by M. domestica(80.90%)and Lucilia sericata(10.11%).In small restaurant, 5 species are recorded, with the percentage of 98.81% Musca domestica and 0.51% Lucilia sericata. In agricultural free market, 27 species are traped, numerical sequence of which is:39.34% L. sericata, 12.96% Aldrichina grahami, 11.13% Musca stabulans, 8.66% Chrysomya megacephala, 0.07—5.28% others. The seasonal appearence of common flies is: Musca domestica in Jan.—Dec., M. Stabulans in May—Sept.,Aldrichiua grahami in Jan.—Sept., Lucilia sericata in April—Nov., Hemipyrellia liqurriens in May—Nov.and Chrysomya megacephala in July—Nov..

Methodology for Evaluation of the Comprehensive Agroecological Effects

Zhu Konglai, Ma Chengxia

1991, (6):  67-70. 

Asbtract ( 1242 )   PDF (373KB) ( 183 )  

By synthetically using AHP, Fuzzy subordination, growing index and other methods, this paper puts forward a set of indices and methods, which are fundamentally quantitative, and combined qualitively for the evaluation of the comprehensive agroecological benefits. Comparing with other methods, this one has been proved to be more concise, comprehensive, and reasonable.