Table of Content

10 April 1985, Volume 4 Issue 02

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Effects of Waters' Characters in Suzhou and Its Periphery on the Ecoiogical Stability and Their Countermeasures

Don Yawen, Zhao Yinwei, Xu Guiqing

1985, (2):  1-5. 

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Characters of waters in Suzhou and its periphery are unsteady flow direction and little speific grandient. According to their social and economic functions streams are classified into four types, i.e., urban water source, self-purification, agricultural and landscaps streams. Regional environmental conditions reduce the self-purification capability of rivers. And hence, the regulation of water capacity and quality will be resolved mainly through combinational action of nature and mankind. Regulating the interelations between city and town, and city and countryside is urgcnt. It is necessary to draw up ecological policy adaptable to city economic reform.

Preliminary Studies on the Growth of File Fish (Novadon septentrinalis) Population

Xu Yongming

1985, (2):  6-9,49. 

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This paper describes the logistic growth equation of population and explains the mathematical nature of the equation. Based on the observation of the cohort biomass of file fish population, the equation of the cohort biomass of file fish population is thus obtained as follows: N_i =700000/(1+e^{-1.0012i+2.3614}). The difference value of the population biomass between time interval T₁ and T₂ is called the increment equilibrium yield in fisheries. The author deems that it is much suitable to estimate the equilibrium yield by using the equation of Y_E=N_i+1-N_i+C_i under the nonequilibrium condition. Finally, the paper makes practical calculation of the biomass of the file fish population.

Ecological Environment of Nipponia nippon Seeking Food Place

Wang Zhonyu, Li Xiaohua, Zheng Xiaobin, Yu Jiangong, Liu Liyan

1985, (2):  10-12. 

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This paper gives a description of the climate and biological conditions of Nipponia nippons seeking food place in Chenggu County of Shanxi Province.

Studies on the Rhizosphere Microbes of Phragmites communis Trin and Its Biological Activities Under Different Ecological Conditions

Duan Junying, He Xiuliang, Dai Xiangpeng, Su Zhengyi

1985, (2):  13-16,23. 

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This paper reports the composition of rhizosphere microflora, N-fixing activity of root system, respiration rate of root and stem, and rhizosphere effect of Phragmites communis Trin. under three moisture conditions (dry, seasonal waterlogging and permanent waterlogging). Results show that in the period of vegetative growth, the total amounts of rhizosphere bacteria and N-fixing bacteria in reed field are larger under condition of seasonal waterlogging. The rhizosphere effect is significant under seasonal and permanent waterlogging. In the period of reproductive growth, N-fixing activity of rcot system under permanent waterlogging is higher. And under these three moisture conditions, respiration rate of root is stronger in the period of vegetative growth than in that of reproductive growth.

Studies on the Biomass and Productivity of Artificial Michelia macclurei Var.sublanea Forest

Qi Zhiyao, MaJiaxi, Li Shunming

1985, (2):  17-19,30. 

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Logarithmic regression equations of leaf biomass (W_L), branch biomass (W_B), trunk biomass (W_T) and root biomass (W_R) to the product of breast diameter (D) and hight (H) D²H, have been worked out respectively for the artificial ecosystem of Michelia macclurei var. sublanea. The biomass is 264.22ton.ha^-1 and the net production is 26.06 ton穐a^-1穣r?^-1 for the stand of 46 years in transition zone between southern subtropics and northern tropics. Owing the net production is still higher than the mean productivity, it should be a productive ecosystem. Michellia macclurei var. sublanea is a good spceies for afforestation in Southern Guangxi, which has a great productive potentiality.

Community Productivity of Corn (Zea mays L.) in Relation to Sowing Time

Wang Tianlun, Su Shanmin

1985, (2):  20-23. 

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The changes of leaf area and dry-matter production of three corn communities with different sowing time are determined. Its considered that the variance of productivity in this experiment must be mainly induced by radiation. Therefore, the latter should be chiefly considered when sowing time of corn community is selected.

The Control of Cadmium Pollution in Agriculture

Chen Tao, Wu Yanyu, Kong Qingxin, Tan Fang

1985, (2):  24-30. 

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The methods of controling cadmium pollution in agriculture arc discussed in this paper, which include controling cadmium discharge of industrial wastewater, preventing cadmium pollution from mineral residues and sludges, working out indexes of environmental capacity of cadmium in soils, and strengthening management and monitoring of water quality in waste water irrigated area.In the Zhangzhi Irrigated Area of Shengyang, the main methods adoped are: adding amendments to soils, controling cadmium pollution sources, stripping of surface soils, taking submerge irrigation technique to avoid the surface soil be dried, and appling some biological techniques. By means of these methods, good results for the local economy society and environment are oblained.

A Preliminary Analysis to the Ecological Characteristics of Vegetable Fields in Guiyang

Luo Qinghuai, Chen Guishu, yang yanfeng

1985, (2):  31-33,37. 

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Based on the interactions of landform, geology, climate and biological population in one hand and vegetable cultivation in another hand, this paper analyses the ecological characteristies of vegetable fields in Guiyang. It's proposed that in order to obtain a stable development of vegetable production in Guiyang and maintain the fine ecological characteristics and favourable yearly circulation, fundamental research work about breeding, soil and fertilizer, cultivation and plant protection must be done.

Ecology of Cotton Field and Pests

Tang Jianguo

1985, (2):  34-37. 

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This paper briefly discusses the fundamental concepts of cotton field ecosystem and illustrates the formation and succession of this ecosystem and the growth and decline patterns of pests. Based on the natural environmental characteristics of cotton planting area in Pengze County, three ecotypes are classified: 1. That of cotton field in plain area along rivers, 2. That of cotton field in hilly area of south-central part, and 3. That of cotton field in hilly and mountainous area of south-eastern part. The physiographic faunae of pests in various ecotypes and the influence of ecological factors on the genesis of pests are also discussed.

Edge Efect and Its Application in Economic Eology

Wang Rusong, Ma Shijun

1985, (2):  38-42. 

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Edge effect is an important phenomenon commonly present in ecosystems and other systems This paper deals with the mechanism of its formation, such as the utilization of niche, the synergism in heterogeneous environment and the “surface-towards effect" in ecosystem succession etc.. various examples of edge effect are presented to show its potential use in economic ecology and some recommendations are put forward.

A preliminary study on the influence of soil physico-chemical properties on the residues of 666 in soil

Ji Yuling

1985, (2):  43-44,55. 

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This paper reports that in paddy soils the correlation between BHC residues and physicochemical properties such as organic matter content, pH value, CEC and bulk density is significant. It is also reported that β-BHC is the most cumulative isomer of BHC in soils.