Table of Content

10 August 1994, Volume 13 Issue 04

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Study on Agroforestry System in Hilly Regions of Central Hubei Province

Wan Yong, Chen Yuhua, Cao Cougui

1994, (4):  1-6,12. 

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This paper introduces three types of better benefical agroforestry systems,crop-paulowina, fruit tree-crop and household-gardening in the hilly regions of Anlu city of Central Hubei.The structural and functional characteristics of t hese three systems are revealed,which shows that agro-forestry system is a land-utilization system with more species,more space-ternporal changing,less input, more output and better benefit.

Cluster and Association Analyses on Distrihution of Rodents in Fujian Province

Wang Shoukun

1994, (4):  7-12. 

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The distribution and interspecific assoclation of rodents in Fujian were studied vvith statistic ecology methods. Among different natural landscapes,the subregions of distribution of rodents in Fujian differ from each other,and are clustered into south and north faunal regions by using cluster analysis. There is a closest relationship between Wuyi and Jiufeng Mountains(northwestern and eastern Fujian province),indicated by 6 indices among10 distance indices. It is revealed that 38 species pairs among 406 species pairs consisting of 29 rodent species in Fujian are significantly associated, in which, 33 pairs are positive and 5 pairs are negative.

Prevention of Saline Water IutrusiOn into the Coastal Zone of Shandong Province

Yang Minghua, Wen Li

1994, (4):  13-18. 

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This paper presents the current status of saline water intrusion into the coastal zone of Laizhuo Gulf, Shandong province.The mechanism of saline water intrusion,its effects on terrestrial ecosystem,and its control strategy are diseussed.The results indicate that anthropogenic disturbance is the major factor causing the problem,and therefore,the first approach to control water intrusion is to focus on adjusting human activities,including management of regional water resources, rational control of industrial,agricultural and municipal water uses.The most efficient way is to practise water-efficient agriculture and eco-agriculture.

Dynamic Research on Rodent Populations in Leizhou Peninsula

Xiao Wenzhong, Mo Guanying

1994, (4):  19-22. 

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The population dynamics of redents in Leizhou peninsula were st ud ied for forty years. During this period,the number of domestic rat Rattus flavipectus decreases and that of Rattus norvegicus and Mus musculus increases,which is connected with rodenticide and ecological environment deratization,and antirat measures in buildings should be strengthened. The number of wild rat Rattus rattoides decreases and that of Bandicata neumorivaga and Rattus rattus hainanicus increases,which may be related to the large scale planting of sugarcane. Rat-surveillance should be strengthened to take effective and practical measures for rat controlling.

Accumnulation aud Migration of Phenol in Sericultural Ecosystem

Pan Rugui, Wu Changnian, Chen Weimin, Guan Jingfang, Wang Jingiiang, Chen Demei

1994, (4):  23-26. 

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Su No. 5 and Su No. 6, two parent silkworms for hybridization,were reared with Husang No.32 mulberry tree leaves polluted by phenol gas or exposed in phenol containing air.It's found that phenol can accumulate in mulberry leaves and transfer to silkworm's body, or directly comes into it,and finally comes to the environment through the excrement of silkworm larva, which constitutes a circulation of accumulation and migration of phenol in sericultural ecosystem.

Simulation Model of Tillering Dynamics of Rice Community

Huang Yao, Gao Liangzhi, Jin Zhiqing, Chen Hua, Ge Daokuo

1994, (4):  27-32,26. 

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Based on the field experiments from 1985 to 1986 in the Yangtze River Valley, and from 1988 to 1989 in Jiangsu province,and using the characteristics of rice varieties,cultivation techniques,weather and nitrogen conditions as basic driven variables,a dynamic model is established to simulate the dynamic process of rice tillering. The results are summarized and shown a close relationship between simulatedand observed values, the correlation coefficient r being 0.956.

Ecological Study on Hexamermis sp

Li Fuchun, Xu Yantian, Nie Guiyun, Fang Qiling

1994, (4):  33-36. 

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April to Aay of each year is the active season of parasitizing of Hexamermis sp.on black cutworm(Agrotis ypsilon rottemberg)and yellow cutworm(Agrotis segetum Schiffermuller). The growth and development of Hexamermis sp.are significantly affected by various environmental factors such as temperature, humidity,solar radition, soil, fertilizer,pH,host,pesticide,etc. ,among which, soil humidity is the major one. The parasitizing rate of Hexamermis sp.varies with soil humidity. Rational application of pesticides,and chemical fertilizers is recommended to protect the Hexamermis sp.and to reduce pollution of the environment.

Biological Research on Lepista sordida Cultivation

Lu chengying, Li Huming, Zhong Yij?

1994, (4):  37-41. 

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epista sordida is a favourite wild edible mushroom with strong aroma. The studies revealed that(1)The optimum pHfor its growth is 6.5,and the suitable range of pHis 67.(2)The optimum temperature for the growth of its mycelia is 26.8℃, and the higher and lower threshold temperatures are 40.67℃ and 0.213 ℃, respectively.(3)Under natural conditions with mean daily temperature 21.627℃ and pH 5.0-5.5, the mycelium can generate fruiting body.(4)This species can exist in extensive media with a biological efficiency of 2734%.

Source, Pool and Flux of Nutrient Cycling in a Combined Agro-Animal Husbandry Ecosystem

Zeng Jianghai, Zhang Yuming

1994, (4):  42-46,22. 

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Based on 20 parameters obtained from field experiment,animal feeding experimerit and 4 years operation of eco-agricultural business,this paper discusses the source, pool and flux of nitrogen and phosphorus cycling in a combined agroanimal husbandry ecosystem. In order to fit the needs of animal husbandry development in the front Taihang Mountain Plain of North China,introducing legume into high-yielding area to build the entity of eco-agriculture business,is a sound strategy for nutrient cycling. It makes the utilization efficiency of mineral Nto be 66.6% and P 63.3% in the farmland ecosystem, and the recovery of Nis 86.6% and P 45.3% in the combined agroanimal husbandry ecosystem.

Role of Microorganisms in Biogeochemical Cycling of Carbon in Oceans

Zheng Tianling, Wang Haili, Hong Huasheng

1994, (4):  47-50. 

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This paper summarizes the role of microorganisms in biogeochemical cycling of carbon in oceans and consists of the following three parts:microorganisms as an important storage of POC,contribution of microorganisms to POC flux and role of microorganisms in POC-DOCtransformation.The authers suggest that the action of bacteria should be the focus of future research to better understand the role of micrcorganisms in maririe ecosystem.

Soil and Water Conservation Efficiencies of several Rotation Patterns on the Loess Plateau of Eastern Gansu

Li Fengrui, Gao Chongyue

1994, (4):  51-54,60. 

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Based on the field trial results carried out on the Loess Plateau of eastern Gansu,this paper evaluates the soil and water conservation efficiencies of several crop rotation patterns with the methods of analytic hierachy process(AHP)and quantitative classification.The results shOw that crop rotation patterns with the best soil and water conservation efficiencies are corn-wheat+bean+corn,corn-millet-corn,corn-wheat+bean-millet,corn-corn-millet,corn-wheat+bean-potato and mil-let-corn-corn

Preliminary Study on Hydrological Effect of Major Forests in Helan Mountain Area

Xu Wanren, Zhang Yongqing, Du Heping, Li Liying

1994, (4):  55-60. 

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Investigation shows that in major forests the percentage of canopy interception is 23.3-29.6%,dry weight of litterfalls is l2.6-39.5t. ha^-1, and water absorption capacity of litter is 230.3-612.7%,The surface soil(0-20cm)planted with major forests can conserve water about 154.60-275.61t. ha^-1(15.5-27.6mm). The water abrorption capacity of forest litter is 2.3-6.2 times larger than its weight.

Date-Base Management System in Changbaishan Forest Ecosystem Research Station

ZhaiYonghua, Zhao Shidong

1994, (4):  61-65. 

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In response to the researches' increasing needs for data management,Data-Base ManagementSystem in Changbaishan Forest Eccoystem Research Station has been developed.Methods adopted in this system are expounded dealing with layout of file directory.documentation development,data entry,data quality control and data formats exchange.

Analysis of Organic Pollutants in Irrigated sewage In Western Shenyang

Liu Hailing, Zhang Lishan, Yao Jiabiao, Yu Dianchen, Zhu Yan, Ke Fu, Jiang Ping

1994, (4):  66-70. 

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In this paper,resin adsorption methed is adopted to analyse the organic pollutants in sewage. About 100 kinds of organic pollutants are effectively separated in water by a capillary column,and 79 kinds of them are identified by GC/MS, among which, 24 kinds of organic pollutants listed in U. S. EPApriority pollutants are quantified by adding severy internal standards proposed inthe analysis. Anumber of pollutants can be simply and quickly quantified by this method.

Urban Ecological gardening and Biodiversity Conservation

Yuan Xingzhong, Liu Hong

1994, (4):  71-74. 

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The relationship between urban ecological gardening and biodiversity conservation is discussed,taking into account of the importance of biological diversity in urban landscape planning. some aspects to conserve biological diversity in urban ecological gardening are approached in this paper.