Table of Content

10 October 1989, Volume 8 Issue 05

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Study on the Nitrogen and Energy Flows in the Straw-mushroom-earthworm-broiler Food Chain

Sun Yufang

1989, (5):  1-3. 

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A charaeteristic food chain in an agro-ecosystem was constituted by three production processes: cultivating mushroom with rice straw, feeding earthworm with mushroom residues and raising broiler with earthworm. In this paper, the input of auxiiary energy and the conversion efficiency of nitrogen and energy in each joint of food chain were calculated from the data of experiment and investigation. The situation of nitrogen and energy flows in the food chain was described and evaluated and was compared with other utilization ways of rice straw.

Numerical Classification of Forest Site on Southern Slope of the Purple Mountain

Ye Jingzhong, Wang Gaofeng, Zhao Renshou, Zhu Naiweng, Ren Baoshan

1989, (5):  4-9. 

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In this paper, multivariate statistics analysis is used to create a numerical approach for the classification of forest site. This approach makes the well-known Bogelebnek’s site Grid Maps become quantitative. Forest sites on the southern slope of the Purple Mountain are classified into 8 major types, each corresponds a definite range of nutrient and water scores. The probability of errorous differentiation is only 9.7%, representing the high accuracy of the 8 site types classified with numerical classification method.

Ordination of Evergreen Broad-leaved Forests in Jinyun Mountain

Liu Yucheng

1989, (5):  10-12,15. 

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In this paper, the stand types of evergreen bread-leaved forests in Jinyun Mountain were subjected to ordination by Polar Ordination (PO) and Principal Component Analysis (PCA) ordination methods. The result shows that ordinations of stands can indicate the change of plant popultion with the change of water and thermal regimes, and reflect the distribution of plant communities. Similar results are obtained by these two methods.

Interrelation Study on SOD and the Distribution of Willow

Jin Yuehua, Du Yingjun

1989, (5):  13-15. 

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The leaves of 6 Salix species collected from different altitudes show two common SOD bands with Rf 0,39 and 0.45. They are characteristic for the genus. Salix rotundifolia and S. metaformosa have new bands, which are indicative for the high elevation environment. SOD activities are much higher for willows distributed at higher elevation. It is indicative for the strength of environmental stress and the adaptation of species to the environment.

Dynamics of Korean Pine Population in Birch Forests of the Changbai Mountain

Wu Hongqi

1989, (5):  16-18,42. 

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After the disturbance of Korean pine spruce-fir forests, Asian white birch (Betula platyphylla) occured first and Korean pine (Pinus koraiensis) population began to regenerate about 40 yrs later. They grew slowly under 10-yrs old and much rapidly from 10 to 30 yrs of age. The growth of Korean pine was different in birch forests with different species composition and stand density. It was mainly affected by various layers of the overstory in birch forests. Individuals over 30-yrs old grew very slowly, the overstory of birch forests bocame the limiting factor for the growth and regeneration of Korean pine population.

Effects of Several Ecological Factors on Pseudopleuronect yokohamae

Bi Shuwan, Zheng Zhenhu, Liu Jinhua, Song Lihui

1989, (5):  19-21. 

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The experiments proved that the lethal content of dissolved oxygen for Pseudopleuronect yokohamae is 1.5ml·L^-1 for larvae fish and 1ml·L^-1 for adult fish.The minimum limit of salinity is 2.6%,and the appropriate temperature is from 3℃ to 26℃. The fish will be died within three to five days at water temperature of 28℃ or 0.5—2℃. In the case of less than fourty fishes per litre, there is no obvious difference between the early larvae fishes growing in static water, but in metamorphosis period, the density of fish has to be reduced to twenty per litre; otherwise, they will be died in great numbers.

Effect of Water Temperature on the Growth Features of Young Crab

Wang Liuquan, Zhou Wanhua

1989, (5):  22-25. 

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An experimental study of cultivating young crab(Eriocheir sinensis) in artificial ponds revealed a linear relationship between shell length and age of young crab and an exponential relationship between its body-weight and age. The growth rate of young crab was slightly different under various ecological conditions. A positive correlation was found between the growth rate of young crab end water temperature in the suitable range of 16.5—32℃ under similar nutrient and dissolved oxygen conditions. Based on the measurement of 185 individuals, the relationship between body-weight and shell length of young crab was expressed as: W=0.4209L^3.1156.

Further Study on Life Table and its Application

Yang Fengxiang

1989, (5):  26-32. 

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Survival analysis was founded by D. R. Cox. It has been widely used in clinical medicine and achieved great advancement in the last two decades, Muenchow and Pyke introduced its application to ccology. This paper further studied the application of this theory to some problems of life table in ecology.The square error estimation of four functions S(t), F(t),f(t) and λ(t) was introduced to clearly reflect the properties of different survival periods. The results were agreed with the experimental data of Li Zhuyin, which was employed as an example of survival analysis.

Regeneration, Symbiosis and Autotrophy-the Three Principles of Eco-cybernetics and Sustainable Development

Wang Rusong, Zhao Jingzhu, Zhao Qintao

1989, (5):  33-36. 

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This paper interprets the three principles of eco-cybernetics, i.e.,regeneration, symbiosis and autotrophy,analyzes the ecological essence of problems caused by the conflicts between development and environment, and seeks the ecological means for the sustainable development of urban and rural economy.

Faunal Analysis of Agricultural Insects and Their Ecological Distribution in Hexi Corridor of Gansu Province

Chen Ming

1989, (5):  37-42. 

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Faunal analysis was made for 491 species of agricultural insects, including pests and their natural enemies, which were collected in Hexi Corridor of Gansu province. The fauna of insects appeared to be intermixture between those of Northeast subregion and Mid-Asia subregion. The author suggested that Hexi Corridor could be divided into two divisions: the east and the west Hexi Corridor divisions. Dominant groups of agricultural insects and their ecological distribution in each division were discussed in the paper.

Fundamental Characters and Ecological Significance Of Vegetation in Forest Natural Reserves in Jiangsu Province

Hong Bigong, Zhao Rulin, Gao Zhaoshan, Jin Jimin

1989, (5):  43-46,63. 

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There are six forest natural reserves in Jiangsu province which belong to three bieclimatic zones: temperate broad-leaved deciduous forest, north-subtropical broad-leaved evergreendeciduous mixed forest and subtropical broad-leaved evergreen forest, In this paper, the fundamental characters and ecological significances of the vegetation were discussed.

Grassland Degradation in the Yellow River Delta

Li Xingdong

1989, (5):  47-49. 

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Grasalands under various exploitation stages in the Yellow River Delta were examined quantitatively, and three equations were established between the variations of height, coverage and biomass of plant community and the accumulative development years. It was concluded that the height, coverage and biomass of plant community were reduced with time under the influences of over-grazing and excessive cutting. Corresponding measures should be adopted for protecting the grassland resources, e.g., separating grazing-and cutting areas, controlling the time and intensity of grazing and cutting, and reducing the amount of livestocks in the grassland.

Determination of Calorific Values of Rice, Brown Planthopper and Spider Theridion cctomaculatum

Ge Feng, Chen Changming

1989, (5):  50-51. 

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The calorific values of rice, brown planthopper and spider Theridion octomaculatum were systematically determined and analyzed in this paper.