Table of Content

10 June 1987, Volume 6 Issue 03

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Industrial Energy Intensifing and Improvement of Chinese Agroecosystems:I.The Analysis of Industrial Energy Intensifing of Chinese Agroecosystems

Wen Dazhong

1987, (3):  1-5. 

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The industrial energy inputs into Chinese agroecosystems in 1982 were estimated and comparedwith those into American agroecosystems in 1975.The average total industrial energy inputper sowed hectare of cereal cropping systems per year and the ratio of total industrial ener-gy input/cereal energy output in China in 1982 were almost as high as those in the UnitedStates.The characters of industrial energy utilizations in Chinese cereal cropping systemswere discussed.

Studies on Microbiological Characteristics During Decomposition Process of Forest Litters Under Broad-Leaved Korean Pine Forest on Northern Slope of Changbai Mountain

Zheng Hongyuan, Li Fengzhen, Lu Yuebo, Zhang Shuxian, Liu Zengzhu, Liu Ruijun

1987, (3):  6-13. 

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The present paper deals with the result of the preliminary investigation on the microbiologicalproperties during the decomposition process of forest litters.The experiment was carried outunder laboratory condition.The emphasis was put on the relationships among material transfor-mation,microbiological dynamics and ability of soil metabolism during the decomposition.1.Thedecomposition rate and intensity of forest litters depended on their composition.In the treatmentwith addition of broad-leaves the decomposition rate was quicker than that in the treatment withaddition of the pine-needles.2.In the decomposition of forest litters the release of energy fromsoil and the cycle of nutrient substrates were related to the abundance and succession of soilmicroorganisms,the activities of soil enzymes,the intensity of oxidative metabolism and thechanges of sugar content in organic matter.3.In the carbon cycle of soil the changes of sugarcontent in organic residues and humic substance might be used to predict the direction of energyand material flows in soil ecosystem.

Field Investigation on Phenomenon of“Midday Rest”of Winter Wheat

Lu Zhenmin, Niu Wenyuan

1987, (3):  14-16. 

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The conclusions about the“midday rest”of winter wheat were drawn based on the greatamount of field investigations.1.The phenomenon of“midday rest”was not the physiologi-cal characteristic inherent in winter wheat.It was caused by stoma dosing at the middayunder water stress of soil.2.The degree of the stoma closing at the midday depended on thelevel of soil water stress and the intensity of solar radiation.3.The phenomenon of“middayrest”could be avoided through increasing the water content of soil.

Forest Vegetation Type of West Tianmu Mountains and Their Characteristics of Distribution

Zhou Xiujia, Ma Weiliang, Liu Yongqiang

1987, (3):  17-20. 

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West Tianmu Mountains is situated in the northwestern Zhejiang province,which is a part ofthe northern boundary of the middle-subtropical Zone.Broad-leaved evergreen forest is itsclimatic vegetation.From the foothill up to the top the vertical distribution of the forest ve-getation arranges in the order of broad-leaved forest evergreen broad-leaved evergreen-deci-duous mixed forest,broad-leaved deciduous forest and deciduous dwarfed forest.The vegeta-tion of West Tianmu Mountains is Characterized by Cryptomeria forest(Cryptomeria for-tunei).

Causal Analysis on the Flood Occured on September 22, 1981 in Nanjing County Fujian Province

Zhao Zhaobing

1987, (3):  21-26. 

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An exceptionally serious flood was occurred in Nanjing County located in the upper andmiddle reaches of the West Stream of the Jiaolong River On Sept.22,1981.The half ofthe county town was flooded and the loss was heavy.Our investigation revealed that theheavy rain brought by typhoon “8116”was the primary cause of the flood.The disruption ofecological balance caused by human activities aggravated this disaster.For example,theincrease of mud in the river water led to the change of sections of riverbed,which reducedthe ability of flood discharge by the river.According to the above analysis,the strategy ofharnessing the river was discussed.

Preliminary Investigation on Periphytic Protozoa in West Lake, Hangzhou

Wei Chongde

1987, (3):  27-29. 

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The present paper deals with the composition and density of the periphytic protozoans inthe West Lake.The total of 102 species of periphytic protozoans was found,of which 59species were pseudoperiphyton and the remaining 43 species euperiphyton.The author con-siders that the current from the Qiantang River to West Lake can play an important rolein improving the water quality of the West Lake.

On Biochemical Interaction Between Organisms——New advance in Ecological Biochemistry

Zheng Zhong, Li Shaoqing

1987, (3):  30-34. 

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The biochemical interaction between various groups of organisms is called allelopathy.It is acommon phenomenon between higher plants,higher-lower plants,insects-plants,higher animals,and phyto-and zooplankton.It is revealed by experimental investigations that certain chemicalsubstances,particularly alkaloids,flavonoids and terpenoids,play an important role in suchbiochemical interaction between or ganisms.It was suggested that research on allelopathy shouldbe carried out as early as possible in order to accelerate the development of ecological bioche-mistry,a new branch of ecological sciences in our country.

Causes of Change of Species Diversity and its Relation With Ecoiogical and Economic Benefits

Peng Shaolin

1987, (3):  35-38. 

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The change of species diversity is influenced by natural and social factors.In this paper thecauses of the change are analyzed.The effects of it on ecological and economic benefits arealso discussed based on the viewpoint of ecological economy.

Historico-Ecological Development of Keerqin Sandy Land and Lessons From It

Tao Yan

1987, (3):  39-42,45. 

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The developing process of Keerqin sandy land under the serious disturbances created byhuman activities was analysed according to historico-ecological point of view.Keerqin sandyland was an extensive grassland with dense pine forest patches in its eastern part only 800years ago,But now the pine forests almost disappeare and the most part of the grasslandhas become sandy land because its misusing.The area of sandy land condinues being expan-ded and the serious ecological disasterns have been brought.The best way of harnessing thesand land would be to make the population increase and the resource exploitation and envi-ronment protection be well coordinated.

Observations on the Reproduction of the Giant Panda in Zoo

Zhu Benren

1987, (3):  43-45. 

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An intensive investigations on the reproductive characters of a female Giant Panda was doneduring 1981—1982.It's shown that the peak of oestius is more suitable for mating.The gesta-tion is 146 days in 1981 and 98 days in 1982.