Table of Content

10 December 1987, Volume 6 Issue 06

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Study on Ecotypical Differentiation of Spartina anglica Hubbard

Zhuang Shuhong, Zhong Congxin

1987, (6):  1-9. 

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No perceptible differences in morphology and anotamy except angles between leaf and stemamong three populations of Spartina anglica from England (Lancashire,Essex and Poole Har-bour) were observed.However,marked differences were found in their ultrastructural changes,proline accumulation and pattern changes of MDH and POD isozymes under various stresses.With all findings we come to the conclusion:three ecotypes have been emerging:Poole har-bour ecotype,Lancashire ecotype and Essex ecotype.The primary ecotypical differentiation ofSpartina anglica is of great importance in selecting of more tolerant and highly productive eco-types with adaptation to various ecological conditions.

Preliminary Study on Ecological Phenology of Chinese Fir in Liluo

Wen Yuanguang, Huang Chengbiao, Liang Hongwen

1987, (6):  10-16. 

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This paper is a report on the preliminary study on the ecological phenology of Chinese fir inLiluo in 1981—1983,1985.1.The periods of height-growth,DBH-growth and sap-flowcoincided with the days when the day average temperature were≥15℃、≥10℃、≥5℃.2.The starting days of the most phenological phases were mostly controlled by the temperature.However,the precipitation affected the needle seasonal phase more than temperature.3.Therhythm of littering was contrary to that of new sprout growth.Vegetative period was poor inlitters,but the dormant period was rich in litters.4.The phenological diagram of Chinesefir in Liluo was made.The regression equations of each organ growth with time were established.5.The climate extremely affected the growth of Chinese fir.the proper combination of waterand heat was the most important factor for the Chinese fir growth.

Improvement of Holling's Disc Equation

Wang Shize, Xia Chugui

1987, (6):  17-18. 

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In the predator-prey system,eating-weariness may be caused by the fullness of predators.Ifthe coefficient of eating-weariness b,a constant of linear equation (Th=Th′+bN),is intro-duced into Holling's disc equation,an improved disc equation will be then obtained: N=a′TN/(1+a′(Th′+bN)N) Th′ is pure handling time without eating-weariness;b is coefficient of eating-weariness,whi-ch may be considered as an index of the abilities of a natural enemy.In the present paper,it was proved that the improved disc equation was better than Holling's original equationbased on studies on the functional response of a ladybird preying upon aphids and an inch-neumonid wasp parasitizing on a ladybird larva.

Quantitative Estimation of Symbiotic Nitrogen Fixation of Soybean with Reference to Graminaceous Crops

Liu Zuoxin, Shen Shanmin

1987, (6):  19-21,41. 

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Maize,sorghum and millet were used as reference crops in quantitatively estimating sym-biotic nitrogen fixation by soybean.With no nitrogen fertilizer application,the amounts ofnitrogen taken up by the three reference crops were closely similar,indicating that the nitro-gen taken up from soil by crops seemed to be controlled by the soil nitrogen release rate whi-ch was not related to the crop types.According to the difference of total nitrogen betweensoybean and reference crops,the nitrogen fixed by soybean was estimated to be 131 to 155kgN per hectare in 1983 and 143 to 163 kg N in 1985,which accounted for 50—55% of thetotal nitrogen in the harvest of soybean.

Preliminary Studies on Community Ecology of Winter Fringillidae Birds in Southern Suburbs of Taiyuan

Liu Huanjin, Lu Xin, Su Hualong, Shen Shouyi, Guo Donglong

1987, (6):  22-25. 

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According to investigation of 12 Fringillidae birds in the southern suburbs of Taiyuan in thewinter of 1982—1984,some basic features of their community structure,including composition,diversity,similarity and dynamics of the communities were discussed.

Preliminary Investigation on Material Circulation in a Household Eco-Agricultural System and Its Economical Benefits

Hu Zaiguo

1987, (6):  26-28,33. 

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Based on a study on the circulation of material in a household eco-agricultural system andits economical benefits it was clear that the process of ecological circling in the eco-agricultu-ral system was rational.The best economical benefit was obtained from the system.It wasthe best way for farmers to get rich and develop modern agriculture in China.

Investigations on Plant Communities and Farming on Coal Gangue Banks in Shanxi Province

Sun Shizhou, Hu Yihui, Cao Kunfang

1987, (6):  29-33. 

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Many species of native wild plants can grow naturally on the gangue banks.It took abouttwenty years for the pioneer plant community to develop into the climax vegetation——the se-condary deciduous bushwood,The clastic gangue is suitable for the growth of many species ofcrops and vegetables,and can yield normal production.Moreover,the gangue contains morephosphorus and potassium than the farm soils do,and it is easy to plough.Thus,biologicalmeasures,especially tree and grass planting or crop cultivation are the best for reclamation ofthe gangue both in ecological and economical principles.

Tea Plantation Types in Qinling-Bashan Mountains in Shanxi Province

Fang Xueliang, Xiao Yongsui, Chen Liangchao

1987, (6):  34-36. 

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According to ecological point of view,the tea plantations in Qinling-Bashan mountains weregrouped into following types:pure tea plantation,chestnut+tea plantation,white mulberry+tea plantation,tung tree+tea plantation,Chinese toon+tea plantation,tung tree+tea+legumeplantation and pine+tea plantation.The relationship of tea growth to the mixed plants grownwith it in each plantation was discussed.Based on the study,“the tree+bush(tea)+grasses” isthe best choice of setting up tea plantation in the mountain area.

Relations between Urban Energy Resources and Urban-Ecosystem

Li Yimin, Zhang Shiying, Zhang Yanhua

1987, (6):  37-41. 

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The characteristics of urban energy resources and its relations to air pollution,calculation andprograming of urban energy resources were discussed.It indicated that the adoption of gas asfuel,thermoelectrical network supply and central heating,reformation of urban industry dis-tribution and improvement in energy structure were important ways to reduce urban air pollution and recover urban ecological balance.

Interrelations and Levels of Ecological Components and Their Regulating and Controlling

Zhou Xiaoping

1987, (6):  42-45. 

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Based on ecological investigations on countryside ecosystems in Changde region,the interre-lations and levels of ecological components were discussed,the methods of their regulatingand controlling were proposed.

Relationship of S Content in Tree Leaves to SO₂ Concentration in Air

Zhang Youbiao, Li Xiaozhu

1987, (6):  46-48,51. 

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A mathematical model of linear regression was developed based on the study on the relation-ship of S content in tree leaves to SO₂ concentration in air.It could be used to indicate the SO₂ pollution in air and provide a basis for biological monitoring of environmental qualityand ecological assessment of environmental impact.

Preliminary Study on Ecological and Economic Benefits of Planting Wheat and Rape at Hilly Areas around West Sichuan Basin

Li Hongquan

1987, (6):  49-51. 

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According to statistical analysis of 8-year productive data,planting rape gained better ecolo-gical and economic benefits than planting wheat in hilly areas around west sichuan basin.Inorder to gain bumper harvest both for grain and rape,countermeasures are put forward toproperly expand the areas of rape and improve the methods of wheat planting.

Study on Soil Catalase Activities of Alpine Meadow

Yang Tao, Du Yiguang, Li Yuying, Jiang Wenbo, Sun Xichun

1987, (6):  52-54. 

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The catalase activities in soils of the four vegetations(Kobresia humilis meadow,Dasiphora fru-ticosa shrub,Elymus nutans meadow and Forbs meadow) were studied at Haibei alpine mea-dow ecosystem research station in 1986.Experimental results showed that the highest catalaseactivities occurred in the soil surface layer and gradually decreased with an increase in soildepth.The soil catalase activities were different with the various vegetation.The catalase activities were correlated with the soil characteristics.The correlations were different with va-rious vegetations.