Table of Content

10 April 1986, Volume 5 Issue 02

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Ecological Distribution of Soil Protozoa under Coniferous-Broad Leaved Mixed Forest in Northern Slope of Changbai Mountain

Cui Zhendong

1986, (2):  1-5. 

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51 species of protozoa are collected from soils under this forest.Monas guttula and other 9 species are wildly distributed.Flagellates is predominant in mean quantity,but Testacea is predo-minant in species numbers.There are marked differences in composition and quantity at different habitats,most in“gullyand grass site in the forest”,next in“Betula platyphylla forest”,and least in“broad-leave-koreanpine forest”.Protozoa generally concentrates in A₀₀ and A₀ layers,but seldom below 20cm.

A preliminary Study on the Influence of Cd and Pb on Photosynthesis of Wood Plants

Huang Huiyi, Zhang Chunxing, Zhang Youbiao

1986, (2):  6-9. 

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In this study,the photosynthesis intensity of five tested wood plants is decreased but no injured symtoms are found when treated with 20 ppm of CdCl₂ or 500 ppm of Pb(NO₃)₂.The decrease of photosynthesis intensity of wood plants polluted by Cd and Pb is related to their tolerance towards heavy metals,which is increased in the order:Persica davidiana,Ailanthusaltissima<Syringa oblata,Fraxinus rhynchophylla<Elaeagnus angustifolia.The influence of CdCl₂ is larger than that of Pb(NO₃)₂。

On the Ecological Efficiency of Shelterbelt Network and Its Yield-Increasing Effect in Paddy Fields

Shi Zhongli, Gao Zhihui

1986, (2):  10-14,5. 

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The ecological efficiency of shelterbelt network in paddy fields is mainly shown in the decreaseof wind velocity and increase of temperature and moisture.As a result of these,the yields ofpaddy rice are increased by 4.2—16.4%.So,it is necessary to establish shelterbelt networks inplainlands and regions of water-network.

Effects of Soil Drought on Physiology and Productivity of Broom Corn Millet and Millet

Zhang Ximei, Shan Lun

1986, (2):  15-18. 

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It is shown through the trails of yields and physiological activities that broom corn millet hasa higher water saturation,less water consumption and higher efficiency of water utilizationthan those of millet.Although the photosyntesis intensity and productivity of millet are higher than those of broom corn millet under optimum cultivation conditions,the yield of millet is lower under drought condition.All in all,drought tolerance of broom corn millet is superior to that of millet and more sui-table to be cultivated under drought environment.

A Numerical Simulation Model of Radiation in Forest Canopy

Wang Hanjie

1986, (2):  19-23,27. 

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In this paper,a simulation model is presented for describing the radiation characteristicsin a forest canopy with specially designated leaf angie distributions.After giving leaf areaindex and reflection and trasmission coefficients of leaves,the model can give a series ofvalues,such as downward and upward radiant fluxes,net radiation and relative net radiationfor each layer of the canopy,and the reflection,transmission and extinction coefficients of thewhole canopy.

A Preliminary Ecological Observation on Alashan Redstart in Winter

Liu Huanjin, Su Hualong, Gao Yun, Ji Wenxiao

1986, (2):  24-27. 

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This paper is a report on the ecological study of alashan redstart(Phoenicurus alaschanicus)during its wintering.The data show that the wintering period is about 180 days,namely,the redstarts arrive at the observed place on the 13—18th of October and fly away on the 14—20th of April.The average value of line transect census is 1.7 per hour in two years,and thequantitative distribution is higher in November but lower in April.In this place,the food forredstart in winter time is mainly made up of common seabuckthorn(Hippophae rhamnoides).

Vegetations in Lakes and Bogs of Dongting Lake District

peng Dechun, Yuan Zhengke, Liao Qifeng, peng Guangyu, Tang Chuanfu

1986, (2):  28-32. 

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There are 77 species,59 genera and 32 families of vascular plants in lakes and bogs of Dongting Lake district.23 populations of 3 groups are consisted of them.This paper describes the com-ponents,structures and biomasses of main vegetation types in this district and discusses theirutilization。

A Preliminary Study on the Concentration Mechanism of ⁶⁰Co and ¹³⁷Cs by Plalymonas sp

Cai Fulong, Chen Ying, Xu Pian, Lin Rongsheng, Lai Zhaocai, Lin Rongcheng

1986, (2):  33-36. 

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It's found that ⁶⁰Co and ¹³⁷Cs concentrated by Plalymonas sp.can be washed out with 0.5% ethylene diamine sodium teracetate.The washed amount is decreased with increasing time of concentration and stabilized in the range of 42—48% after 16 hours.Loss experiment shows thatthe amount of ⁶⁰Co and ¹³⁷Cs in Plalymonas sp.is influenced by biotic dilution after cell multiplication.Potasium cyanide and iodcacetic acid can slightly inhibit the concentration of ⁶⁰Coand ¹³⁷Cs when added previously.However,when the inhibitors are added with ⁶⁰Co and ¹³⁷C sat the same time,the concentration of nuclides are premoted.It's considered that this promotion is not physiological action but physical and chemical adsorption.

Fundamental Characteristics of Forest Vegetation in Liaoning Province and Their Transformation and Utilization Approaches

Xu Wenduo

1986, (2):  37-40. 

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The present paper describes the species composition,flora characteristics,fundamental types,distribution patterns and the transformation and utilization approaches of forest vegetation in Liaoning province.

Analysis of Urban Ecological System in Chongqing

Tang Yongluan

1986, (2):  41-44. 

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With the theory and methodology of urban ecological system,this article researches the ways of eliminating wastes for making city beautiful,improving people's daily life and promoting production.It layes emphasis on that the urban environment and its natural environment must be considered as a whole,and the self-cleaning capacity of natural eco-system must be made used of.In order to reduce the atmospheric polution,high chimnies should be built.Urban district suburb must be also considered as a whole.In order to protect the water resources of Yiangzhi River and Jialingjiang River,the cleaning capacity of land system should be made used of for handling the industrial and domestic wastes and making them useful.

Quantitative Characterization of N-Inputs and Outputs in Modern Agroecosystems

Wu Shanmei

1986, (2):  45-48,52. 

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Quantitative descriptions of N-inputs through fertilizer application,N-fixation,precipitation and irrigation and N-outputs through harvest,leaching,run off,denitrification,ammonia volatilization and direct loss from plant leaves are presented and analysed in reference to dealing with nitrogen cycling in modern agroecosystem.Asimplified approach has been suggested to establish the nitrogen balance model under certain soil conditions and agricultural practices.

Information in Ecological Systems

Xu Hongchang

1986, (2):  49-52. 

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This paper gives a tentative analysis of the function of information in organizations of ecological systems and the relationship between information flows and matter-energy flows within them,and thus,introduces the concept of“quality factor of energy”.On this basis,the writer expresses his view of the rational utilization of energy and ecological engineering.