Table of Content

10 August 1986, Volume 5 Issue 04

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Energetics Study of the Agroecosystems in Northeastern China I. Energy Flow Through a Typical Agroecosystem in Songnen Plain

Wen Dazhong

1986, (4):  1-5. 

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The energy flow through a typical agroecosystem located in Hailun county of Songnen plain in Heilongjiang province was analysed in 1976—1978.An energy flow chart was drawn and some characters of the energy flow in this agroecosystem were discussed

A preliminary Study on the Structure and Dynamic of Spider Community in Paddy Fields

Wu Ya, Jin Cuixia

1986, (4):  6-11. 

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Spider communities were investigated in 10 paddy fields.All results are reported in this paper,including the structures of species,space and time of communities and the influences of rice varieties and insecticides on the structure and function of communities.

Articles

Investigation and Analysis on the Resources of Eriocheir sinensis′Larvae in the Changjiang Estuary of Shanghai Region

Shi Ming, Zhu Longbiao

1986, (4):  12-15. 

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The relationship between the amount of Eriocheir sinensis'larvae and various factors is analysed in this paper.It is observed that in recent years,the amount of Eriocheir sinensis'larvae is obviously decreased.Besides the influence of water conservancy project,the changes of Changjiang estuary and the pollution of water-body,over-catching of crab's parents is a very important factor.It is suggested that not only the ecological environment of Changjiang estuary,but also the spawning site and spawning parents of Eriocheir sinensis should be protected.

Vertical Ecoclimatic Layers in Hilly Regions of Zhejiang Province and Tea Production

Zhou Zikang

1986, (4):  16-19,29. 

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There exists a relationship between the yield and quality of tea and the vertical distribution of ecoclimate.This paper gives a division of vertical ecoclimatic layers for tea plants and discusses how the yield and quality of tea are related to the different ecoclimatic layers.

Study on the Population Ecology of Stonechat During Its Brreeding Period

Yang Jiongli, Meng Su, Zou Xun

1986, (4):  20-24. 

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Stonechat usually arrives Guiyang at the beginning of March,Its breeding period is from March to July.The height of nest is 7.50(5.50—10.00)cm,its depth is 3.90(3.50—4.50)cm,the inner diameter is 6.81(5.50—8.00)cm and the exterior diameter is 12.13(12.00—18.00)cm.The egg number of each clutch is 4.90(4.00—6.00).And each egg is 15.90(12.60—19.00)×13.82(12.00—16.81)mm in size and 1.88(1.65—2.65)g in weight.Incubation period lasts about 11—12 days.The percentage of hatch is about 86.6%.

Ecological Studies on Tetrastichus schoenobii Ferriere

Wu Dunsu

1986, (4):  25-29. 

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Aseries of studies on the experimental ecology and field ecology of Tetrastichus shoenobii Ferriere was made by the author to evaluate the inhibition ability of this insect to the generation of trivoltine snout moth's larva.

Interelationship Between Hippophae rhamnoides and Some Birds and Beasts

Feng Jingyi, Ma Zhiben, Su Hualong, Liu Huanjin

1986, (4):  30-32. 

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Based on field investigations,this paper discusses the important ecological significance of Hippophae rhamnoides in animal and plant communities and the ways of comprehensively utilizing natural resources of this plant.

On the Ecological Balance of Our Fresh Water Resources

Wang Yeju

1986, (4):  33-36. 

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The author points out:(1)fresh water is deficient in north and acidic in south,(2)acid rain is widely spreaded in this country,(3)water and soil erosion is very serious,(4)fresh water bodies are largely disturbed by crop fields,and(5)both ground and underground water are polluted.It is considered that for each kind of ecosystem,the common task is to preserve fresh water resources.

Application of Dynamic Structural Modelling in Ecosystem Analysis

Li Bailian

1986, (4):  37-40. 

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This paper describes the application of simulator method of dynamic structural modelling in analyses of n-dimensional ecosystems or subecosystems and gives the“haggard-rabbit-grass”ecosystem as an example.It is shown that this method is more useful than the well-known Forrester's one.

An Analysis of Energy-and Material Flow in Urban Ecosystem of Tangshan City

Cui Xuezeng, Zhang Fenggang, Zhang Lianhua

1986, (4):  41-45. 

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After studying the patterns of energy-and material flow within the urban ecosystem of Tangshan,this paper discusses the relationship between the utilization of energy and material on one hand and the environment,population and economic development on the other hand.A suggestion of regulating the consumption of energy and material is also put forward.

Influence of Groundwater Table Fall and Soil Salinization to Meadow Vegetations in Mid-and Downstreams of the Shuleihe of Gansu and Their Countermeasures

Qiu Min gxin, Yang Zucheng

1986, (4):  46-49. 

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Owing to the groundwater table fall and soil salinization being increased day by day,meadow vegetations have been degenerated and died in the mid-and downstreams of the Shuleihe.It has become one of the serious ecological problems in the production of livestock husbandry here.The countermeasures ought to be:utilize water resources rationally,ameliorate salty soils andimprove meadow vegetations.

On the Exploitation and Utilization of Seabeaches in Jiangsu Province From the Development of Sheyang Tree Farm

Cai Shikui, Gu Yanquan, Chen Mingbo, Huan Baoqing

1986, (4):  50-52. 

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Sheyang tree farm was established in 1690.After 20 and more years'exploitation,the ecologic,social and economic efficiencies got from it are higher than those got from the farms exploited in the same year.It is suggested that the exploitation of seabeaches in Jiangsu province should give priority to the development of forestry and stren gthen the establishment of natural protection regions along seabeaches.