Table of Content

10 October 1988, Volume 7 Issue 05

Previous Issue    Next Issue

System Analysis and Dynamic Simulation of Nitrogen Cycling in Three Different Stages of Agricultural Development in Chagan Village

Chen Shiping, W.M. Blacklow

1988, (5):  1-8. 

Asbtract ( 1261 )   PDF (731KB) ( 157 )  

Persisting in an organic way, starting with afforestation and growing legume green manure crops, along with reforming cropping system and agricultural structure, Chagan village transformed from a typical backward, povertystricken village into one of advanced villages in northwest Liaoning province in the last two decades. Soil degradation has been controlled, vicious circle of agroecosystetn has changed into a virtuous one, and the trend of soil-Ndepletion has been reversed. In this paper, the main experiences were analysed from an ecological point of view and dynamic models for simulating N-cycling of three different stages were presented and discussed.

Ecological Simulation Test of Paddy Soil: Effects of Soil Water Regime on Crop Growth and Nutrient Transfer

Wang Dejian, Xu Qi

1988, (5):  9-15. 

Asbtract ( 1214 )   PDF (606KB) ( 150 )  

Asimulating test was made for examining the effect of soil water regime on the growth of rice and wheat. Apermeable soil colume with water percolation of 15mm diurnally in the growing season of rice and groundwater level being controlled at 70—80cm in the growing season of wheat was favourable for the growth of rice and wheat. Thus, the function of paddy soil ecosystem can be improved by regulating soil water regimes. Abudget calculation of nutrients showed that N, Pand Ca were surplus and K, Si, Mg, Fe and Mn were deficit in the soil colume. After 3 years of submerging, the differentiation of Fe and Mn in the soil profile had been observed, which was coincided with that under natural conditions.

Influence of Microwave Radiation on Embryonic Development of Rana limnocharis

Du Maoqin, Dong Hai, Wu Shuhu, Wang Shan

1988, (5):  16-20,34. 

Asbtract ( 1453 )   PDF (505KB) ( 206 )  

Aspecific experimental device of microwave radiation was used for accurate count of "SAR" dose. Among 1650 eggs of Rana limnocharis, 650 eggs were control and 1000 eggs subjected to the radiation by LW-1 microwave machine which was made in Nanjing with a frequency of 2450 MHz at 8—28℃. The experimental eggs were divided into 4 groups (A, B, C and D) and radiated by microwave at 50 (mW/g), 100, 150 and 200 SAR respectively. Each group was subdivided into 3 small groups (100 eggs for one) and radiated for 4,8,32 min. respectively. Increase in mortality and embryonic malformation and development of Rana limnocharis after microwave radiation was observed and non-thermal effect of microwave was found.

Investigation and Analysis on Ecological Factors Suitable for Sweet Osmanthus

Yang Kangmin, Zhu Wenjiang

1988, (5):  21-25. 

Asbtract ( 1600 )   PDF (725KB) ( 408 )  

The growth and development of Osmanthus are related to the latitude and altitude of its distribution areas and also affected by the air pollution, light intensity, soil condition etc. in planted sites. According to the investigation and analysis, seven selections for more suitable planting plots are suggested:(1)north and mid sub-tropics;(2)mountainous uplands or well-drained plain soils; (3)city suburbs; (4) air and light sufficient areas;(5)deep and humus-rich soils; (6)no surface paving areas and (7) enclosely managed gardens.

Calorific Study on Chinese Fir and Homana Trees and their Stands

Zhang Jiawu, Zhao Jilu, Chen Chuying, Wang Kaiping, Zeng Shiyu, Deng Shijian

1988, (5):  26-29. 

Asbtract ( 1326 )   PDF (366KB) ( 196 )  

Data were given for the calorific values and energy distributions in trees and stands of Cunninghamia lanceolaat and Michelia macclurei. As regards to the utilization of solar energy, the rationally mixed forest of Cunninghamia lanceolaat-Michelia macclurei was better than their pure forests. Such mixed forest should be highly advocated in south areas of China.

Eco-environment of Lake and Bog Wetlands in Hannan Flooding Region of Hubei Province

Zhang Yanyi, Guo Dehui

1988, (5):  30-34. 

Asbtract ( 1171 )   PDF (493KB) ( 240 )  

This paper discussed the present situation and development trend of the wetland ecological environments in Hannan flooding region, analysed the artificial and natural factors causing the change of eco-environments and suggested ways and measures for the rational utilization and preservation of natural resources (esp. bio-resources) in this region.

City Ecology and Landscape Gardening

Xue Derong

1988, (5):  35-40. 

Asbtract ( 1170 )   PDF (616KB) ( 225 )  

In this paper, the author briefly summarizes the main characteristics of city ecosystem, points out several principles of its reasonably building and emphasizes the important role of landscape gardening in improving the quality of city ecological environment, and finally,introduces some developing trends of landscape gardening in several citiesa broad.

Breed Formation and It's Ecological Variation Patterns of Ass in Shanxi Province

Duan Yahbin, Zhang Ruixue

1988, (5):  41-45,49. 

Asbtract ( 1171 )   PDF (543KB) ( 211 )  

Through comparing the quantitative distribution, formation history, body size, weight and blood physiological indexes among three ass breeds in Shanxi province, the variation patterns of ass breeds in different eco-environments were discussed, which provided scientific basis for the future preservation of fine ass breeds and the designing of breeding zones.

Structure and Behavioral Characteristics of Human Ecosystem

Nan Zhongren

1988, (5):  46-49. 

Asbtract ( 1075 )   PDF (404KB) ( 204 )  

Based on the thermodynamic analysis, this paper Contributes to the understanding of the structure and behavioral characteristics of human ecosystem. The technical behavior was stressed on showing the social properties of humanity and the fundamental characteristic of human ecosystem process.

Acid Rain and the Occurence of Diseases in Pinus massoniana

Yuan Zhiwen

1988, (5):  50-52. 

Asbtract ( 1210 )   PDF (306KB) ( 197 )  

The effects of acid rain on the susceptibility of Pinus massoniana to Lophodermium pinastri and Meloderma desmazierii were studied in several regions of Chongqing. The incidence of diseases was severer on trees in heavy acid rain areas. But, under conditions with pH<4.0, L.pinastri is inhibited. The percentage of needles covered with saprophytic fungi is much higher in heavy acid rain areas. Acid rain may be considered as one of the most important factors for the death of pinus massoniana in Manan of Chongqing.