Table of Content

10 April 1990, Volume 9 Issue 02

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The Second Heat source of Wheat Populations and Its Heating Effects

Zhang Songwu

1990, (2):  1-6. 

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This paper shows the following results:1.The second heat source of wheat populations hasa significant effect on plant temperature distribution,2.The second heat source of dwarfwheat population has a higher temperature level and stronger emitting power than those of tailone,3.Under the influence of the second heat source,plant temperature is higher for dwarfwheat population,especially during milk stage,which easily accelerates wheat senescenceand even causes damages,4.By transforming the second heat source,the senescence processof dwarf wheat can be retarded and the early senescence can be prevented.

Importance of Animal Ecological Study in the Research of Host Animals for the Epidemic Hemorrhagic Fever in Great Xingan Mountains

Luo Zexun

1990, (2):  7-12. 

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Epidemic hemorrhagic fever was first discovered in 1950s in the Great Xingan Mountains.Based on animal eeologlcal study and epidemiological analysis,it is determined that stripedfield mouse(Apodemus agrarius Pallas)is the host for the disease,which severely competewith house mice species.Striped field mouse inhabits mostly in residential areas and mig-rates seasonally.After extensive killing of the striped field mouse,the disease has been effectively controlled since 1960.But in Chaocha forestry farm and Daomuda region,there stillexists natural sources of disease,which reqiures attention from different levels.

Influence of Ecoenvironment in Tea Plantations on Development of Tea Trees and Quality of Tea

Shu Qingling, Zhao Hetao

1990, (2):  13-17. 

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The experiment shows that in favourable tea plantation ecoenvironments,the height,canopyscope,leaf area,diameter of main branches,length and weight of shoot and ratio of normalshoots of tea trees are higher than in unfavourable ecoenvironment.The production of teaand output value are 23.1% and 59.4% higher respectively.The quality of tea and the con-tents of polyphenol,amino acids and water extracts in tea leaves are also superior.It'simportant for tea production to protect and establish a favourable ecoenvironment in tea plantations.

Spatial Pattern of Cotinus coggygria var.cinerea Scrub in Qingzhou Mountainous Area of Shandong Province and Relations between Its Population and Environment

Zhao Ming

1990, (2):  18-23. 

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The spatial pattern of smoke tree(Cotinus coggygria var.cinerea)scrub is studied by thepoint-quadrat method in Qingzhou mountainous area of Shandong province,and the relationsbetween its main species and three environmental factors,including solar radiation,soilmoisture and soil organie matter content are analysed,It shows that all these environmentalfaetors strongly affeets the growth of shrub and undergrowing herbs.

Ecological Dominance of Alpine Tundra Phyto-communities on the Changbai Mountains

Qian Hong

1990, (2):  24-27,58. 

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Eoological dominaces of fifty-nine alpine tundra plant associations are measured.The valuesof alpine tundra phyto-communities on the Changbai Mountains generally vary from 0.05 to 0.4,which is negatively correlated with species diversity.It is suitable to choose ecologicaldominance as a comprhensive index at community level.

Selection of Tree Species for Afforestation in Fluoride Pollution Regions

Yu Mengde, Yi Jingdu

1990, (2):  28-31. 

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1.Afforestation experiment has been taken out in a phosphorus fertilizer factory for 118 in-dividuals of 65 species.After 18months of afforesting,only 75 individuals of 51 species arealive.2.The response of trees to fluoride pollution varies with tree species,concentrationof air pollutant and distance from pollution source.3.Total F content in leaves shows thatall trees have the ability of absorpting and accumulating fluoride and the purgative effect toair pollution.4.According to their response to F pollution,the survival trees are dividedinto three groups:strong resistant,meso-resistant and weak resistant.

Forest Resource Models Simulation Research

Li Hongxin, Yi Yunwen

1990, (2):  32-35,12. 

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A dynamic model is built up by means of system dynamics method for the development offorest resources in Liaoning province.Prediction and strategy research are made for the fo-rest ecology and timber production in 2000 in Liaoning.The impactions of various designson the development of forest resources are understood by adjusting different parameters andadding disturbances to the model.Various parameters are determined according to the dataprovided by Land Dept.and Forestry Dept.of Liaoning province,the data of provincialforest statistics in 1978 is taken as the original values for running model,which is perfor-med on IBM PC/X7 computer in DYNAMO language of system dynamics.

Preliminary Study on the Introduction of novel Species to an Agroecosystem

Zhang Xigu, Zhai Yushun

1990, (2):  36-39. 

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The purpose,principle and method of introducing novel species to an agroecosystem are discussed from the viewpoints of agroecology and systematics.The main purposes of introducingnovel species should be:expanding production,increasing profits,eliminating or controllingpollution and increasing the stability of system.The principles which should be observedare:principles of system organization,principles of ecological niche and principles of dynamic development.Finally,methods for feasibility study in introducing novel species andsteps for noevl species introduction are commented.

Climatic-ecological Suitability for Developing Maize Zones in Central Jilin Province

Ma Shuqing

1990, (2):  40-45. 

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Climatic-ecological conditions for growing maize are compared for the central region ofJilin province with maize zones in America and Europe.The water-thermal conditions indevelopmental stages of maize and the climatic productive potentiality in central Jilin areanalysed in comparison with the western and eastern parts of the province.It is concludedthat the central part of Jilin province has the regional superiority for growing maize,whichshould be strengthened and developed.With optimization analysis of growing structures,the optimum ratio of maize is 40—60% of cultivated area,the weighted average value is 48.48%.

Super-coordination Theory for Programming of Regional Urban Groups——Application of Ecological Principles in Urban Planning

Feng Xiangdong

1990, (2):  46-49,53. 

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The energy and resources needed for population and economic growth should be structurallyoptimized and functionally coordinated with the natural providing ability confined by regional“environmental capacity”and“ecological sustainability”,realizing the best effective supercoordination.This is the highest objective of designing for the harmony of man and natureand the fundamental principle for regional urban planning.The nowadays disoiders are the important causes of the“city diseases”and the destruction of regional ecological stability.It requires precautions of various circles.

On the Characteristics of Suburb Ecolomic System

Ma Chuandong

1990, (2):  50-53. 

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The suburb ecolomic system has the following characteristics:(1)it is a system of an integrativetype with urban and rural areas,(2)its edge effect is strong,(3)the substance circulationand energy flow in it are more complicative.

A Brief Comment on Age Determination Methods for Small mammals

Yang Hefang

1990, (2):  54-55. 

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This paper briefly introduces the methods for age determination of small mammals Differentage indicators and their seasonal variations are also discussed.

Relations between Growth of Haplotropis brunneriana and Temperature and Humidity and Thief Long-range Forecasting in Kazuo County

Sun Lide, Liu Yajun, Gao Chengshan, Yu Zhixin

1990, (2):  56-58. 

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Relations between growth of Haplotropes brunneriana and meteorological factors are studied,and the temperature,humidity and accumulated temperature during various age classes aredetermined.Based on these results,the long-range forecasting models for the occurence degre-es of the pest are established.

Measurement of N₂O Evolved by Soil in Situ

Chen Guanxiong, Shang Shuhui, Wu Jie, Hu Liansheng, Yu Adong

1990, (2):  59-62. 

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Recently-documented increases in atmospheric N₂O concentrations have stimulated substantialinterests for measuring the rate of N₂O flux from terrestrial sources to the atmosphere.Microbial nitrification-denitrification process appears to be the major source of global N₂Oflux.In this experiment,an apparatus is used for measuring N₂O evolved by soil in Situ,based on the inhibition of the reaction N₂O→N₂ by acetylene.The experimental results obtained under field conditions are presented,showing the appratus to be highly sensitive,reproducible and suitable for use in fields.

Exploitation and Conservation of Vegetative Resources around Qingtongxia Reservoir in Ningxia

Xu Wanren

1990, (2):  63-65,23. 

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The Qingtongxia reservoir region is the only comprehensive natural reserve in Ningxia withnatural forest vegetations,rare birds,hydrobios and vast water areas.The vegetations aredivided into 5 main types:deciduous broadleaved forest,bush,grassland,meadow and marsh.Their natural succession patterns are analysed.Problems concerning the conservationand utilization of this reservoir region are discussed.