Table of Content

10 June 1985, Volume 4 Issue 03

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Study on the Ecology of Zooplanktons Before and After Damming up ChangJiang River by Gezhou Dam

Chen Shouzhong

1985, (3):  1-4,26. 

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The ecology of zooplanktons in upper and lower reaches of Changjiang River near Gezhou Dam was investigated before and after damming up the River. It was shown that in the middle of the River, the species and amounts of zooplanktons were the same as 20 years ago, but in standing and slowly flowing areas in front of the Dam, they were obviously increased. In the upper reaches from Nanjinguan and lower reaches from Yichang, no or less changes were found.

Influence of Air Fluoride Pollution on Herbages

Gao De, Liu Huanzhi

1985, (3):  5-9. 

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This paper preliminarily deals with the diffusion pattern of air fluoride, distribution pattern of fluoride pollution and influence of this pollution on herbages in western part of Baotou iron and steel plant. Results show that: 1. a stepwise change with the distance of pollution source and a significant correlation can be found for the concentration of air fluoride and the content of fluoride in herbages; 2. no obvious influence of fluoride pollution is appeared for the growth and development of herbages.

A Preliminary Analysis on the Seasonal Structure and Biological Rhythm of Tropical Rain Forest Regions in Southern Yunnan

Lu Dekang

1985, (3):  10-15,21. 

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The season structure of tropical rain forest regions in Southern Yunnan has a significant difference with the climate structure of typic tropical rain forest. It has five season stages with different combinations of drought, humidness, cold and hotness. Therefore, tropical forest in Southern Yunnan although has the fundamental characteristics of tropical rain forest, yet exhibits significant variances and distinct season phases in particular. Such a kind of rain forest with seasonal features is called chinese type seasonal rain forest. Under the influence of this climate rhythm, the introduced Brazilian rubber tree exhibits some new characteristics.

Characteristic Analyses of Evergreen Broadleaf Trees in Dongtinghu Area

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

1985, (3):  16-21. 

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Evergreen broadleaf trees grown on hilly lands of Dongtinghu area consist of 6 populations. These populations except that of camphor tree have more stable structure and components, being zonal vegetations of this area. They are cold-resistant and occur in the northern distribution limit of evergreen broadleaf trees, exhibiting characteristics of transition from northern Asian tropical vegetation to central Asian tropial vegetation. In the forests, there are 268 species (156 genera, 84 families) of plants with vascular bundle.

Influence of Light on the Growth and Development of Tetranychus cinnabarinus

Wu Qianhong, Ding Zhaorong

1985, (3):  22-26. 

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The life history of Tetranychus cinnabariinus (Bosduval)(Acari:Tetranychidae)was investigated under two light conditions of 15hr (9hr dark)and 9hr (15hr dark with constant temperature (29℃) and relative humidity (60—80%). The periods of life cycle, preoviposition and oviposition, oviposition rate, sex ratio, net reproductive rate, mean generation time, and intrinsic and finite increasing rates were determined respectively.

High Efficiency and Harmony——on the Role of Ecological principles in the Reformation of Urban Districts

Ma shijun

1985, (3):  27-30. 

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This paper discusses the position of urban districts in ecological study, role of principles of high efficiency and harmony in the reformation of urban districts and main problems required to be studied and solved in the respects of urban population, resource and environment.

Analysis of Ecologic Agricultural Model of Guangming Overcea Chinese Livestock Farm in Guangdong Province

Tang Yongluan

1985, (3):  31-34. 

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Guangming oversea Chinese livestock farm is situated in the north-west of Shenzhen City of Guangdong. It primarily raises cows. The products are exported to Hong Kong. They can meet 70 per cent of demand of Hong Kong market.Based on the on-the-spot investigation, the author puts forward a basic ecologic agricultural model for this farm and approaches the ways of giving full play to its economic, ecologic, environmental and social efficiencies.

Kira's Temperature Indices and Their Application in the Study of Vegetation

Xu Wenduo

1985, (3):  35-39. 

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This paper introduces the concept and count method of Kira's warmth index (WI) and coldncss index (CI). Based on WI, humidity index (HI=P/WI) is proposed by the author, where p is the mean annual precipitation (mm). Correlations between the distribution of 43 tree species and thermal status in northeastern China are studied. The WI of distribution limit of trees in mountainous regions of northeastern China is 15℃. month. The border line between forest and grassland has the HI value of 7.5 mm/℃. month, and that between forest grassland and steppe, 5.2mm/℃. month.

Approach to the Strategic Problems of Agriculture in Guangxi

Luo Hanjun

1985, (3):  40-42. 

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In this paper, four problems are discussed, 1. importance of ecological strategy in the development of agriculture; 2. eco-geographical structure and ecological equilibrium of river basin; 3. several paradigms of the development of agriculture; and 4.ecological approach to the agricultural development in Guangxi.

Micro-Habitat of Trichogramma evanescens

Xia Bangying

1985, (3):  43-45. 

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The micro-structure of Trichogramma evanescens's mouthpart and hostegg is observed by the author. It's considered that Trichogramma evanescens's mouthpart is a new type of special mouthparts of insects, and hostegg supplies the needs of nutrients and respiration-metabolism for Trichogramma evanescens's larva. Therefore, hostegg can be considered as the micro-habitat for the growth and development of Trichogramma evanescens.

The Role of Forest in the Agricultural Production of Mountainous Regions—Take Duanjiafan Village as an Example

Agricultural Divisions Office of Macheng County, Hubei Province, Forestry Bureau of Macheng County, Hubei Province

1985, (3):  46-47. 

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Since 1970, Duanjiafan village of Macheng County has paid much attention to the forestry production. As a result of 13 years' effort, 6,432mu of land has been afforested, and the covering rate of forest is 80%. In doing so, the ability against natural calamities is enhanced, soils are ameliorated, crop yields are increased, and the stand storage of wood is increased to 72%.

Analysis of biological productivity of tung trees under different management levels

Liu Fukan, Gong Zhijun

1985, (3):  48-50. 

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Based on the analysis of three types of management (intensive, general and extensive) in the growth period of tung trees, it's concluded that the biological productivity of tung trees is increased with increasing management level. The productivity under intensive management is twice as much as that under extensive management. Therefore, to enhance the management of tung trees can effectively increase their productivity.