Table of Content

10 December 1996, Volume 15 Issue 06

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Estimate of the Net Primary Productivity for Subtropical Evergreen Broadleaved Forest in China

Ni Jian

1996, (6):  1-8. 

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he net primary productivity (NPP) of subtropical evergreen broadleaved forest(SEBF) in China was calculated by means of Holdridge's life zone classification system and Chikugo model. The change of NPP of SEBF was also estimated under the global warming caused by doubled CO₂ content in the atmosphere. The results showed that the NPP value of SEBF is meanly 12.81t·hm^-2·a^-1 under present climatic condition. When the annual mean temperature increases 2℃ and the annual precipitation increases 20%, NPP may increase 2.14t·hm^-2·a^-1 ,up to 14.95t·hm^-2·a^-1 . When the annual mean temperature increases 4℃ and the annual precipitation increases 20%, NPP may increase 2.60t·hm^-2·a^-1 , up to 15.41t·hm^-2·a^-1 .

Studies of Ecological Characteristics of Twelve Tree and Grass Species

Xia Hexin, Yang Hong, Zhou Gang

1996, (6):  9-12. 

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cological characteristics of 12 tree and grass species were studied in the red soil hill areas in order to resolve the forming technology of protection of the forest stand instruction in the upper and middle reaches of Yangtzi River. The resistance to shade, drought endurance and water endurance of 12 tree and grass species were examined. The results indicated that Gordnia jasminoldes Ellis , Zingiber officinale Rosc , Glycine max (L.) Merr and Vitex negundo L. were plants resistant to water; Zinziphus jujuba Mill, Gardenia jiasminoides Ellis, Pinus ellliottii Engelm, Robinia pseudoacacia L. and Vitex negundo L. were drought enduring plants; Gardenia jasminoides Ellis, Zingiber officinale Rosc and Cmellia oleifea Abel were plants resistant to shade.

Study on Population Stability of Picea mongolica on Sandy Land

Zheng Yuanrun, Xu Wenduo

1996, (6):  13-16. 

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ased on the field survey data, fecundity schedules of Picea mongolica population on sandy land were established and a series of parameters of population increment was calculated. Stability of the spruce population was analysed according to R.May's stability theory and the parameters of population increments in this paper. The results are as follows: Intrinsic increment rates of the spruce populations in mixed spruce forest, spruce forest with grasses, spruce forest with grasses and mosses are higher, but generation length of above spruce population is shorter. Owing to environmental conditions on sandy land,the spruce population must increase its reproductive rate to gainitself stable existence by large consumption of sapling pool. When it is disturbed, so long as disturbed intensity is not too strong and with suitable protective measures, spruce population will sustainedly exist on sandy land in the Inner Mongolia.

Influence of Humidity on the Survival of Citrus Leaf Miner

Wang Liande, You Minsheng

1996, (6):  17-21. 

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The present paper deals with the influence of humidity on the citrus leaf miner, Phyllocoistis citrella Stn. The results of investigation showed that: 1)Under the condition of 7 relative humidities(35%,45%,55%,65%,75%,85%,95%),the effect of humidity on the leaf miner survival (S(RH)) can be described with the model proposed by Wang Rusong et al.(1980); 2)the most sui￣table humidity of the citrus leaf miner is 80%, the minimum critical humidity is 35%, the maximum critical humidity is 95%-96%; 3)as to the resistance to drought, eggs are the strongest, larvae the second, pupae the third, the old larvae have a stronger resistance to drought than the young; 4) between the minimum critical humidity and the suitable humidity, the survival curve can be fitted with the type of Devey Ⅲ.

Studies on VA Mycorrhizal State of Pteridophytes and Their Coevolution

Zhao Zhiwei, Zhang Tao, He Zhaorong

1996, (6):  22-25. 

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Survey was made on 44 species of pteridophytes in Yunnan provance in terms of VA mycorrhizae. The coevolution of pteridophytes and VA mycorrhizal fungi was discussed. The results shown that 18 species of pteridophytes were typically mycorrhized, the fungi which infected pteridophytes to form VA mycorrhiza belong to the genus of Glomus. VA mycorrhiza was a primitive biological character, it has a positive evolutionary indication in the origin and evolution of land plants.

Studies of Phenology of Calytratae Flies in Western Sichuan,China

Feng Yan

1996, (6):  26-35. 

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henology of calytratae flies in western Sichuan Province was studied during 1982-1994. The results showed that the adult flies present in all seventy two periods of phenology in a year, There are two types of flies, the cold taxis type and the thermotaxis type. The phenological phenomena of the cold taxis type of the most flies could be observed in a year round; some phenological phenomena begin from the year and lasted until next year. A few species have two times cycling in a year . The phenological phenomena of the flies species of the thermotaxis type showed in a year round and few species lasted to the next year. According to 265 phenological phenomena observed, Elaeagnus pungens is belonged to cold taxis type species while Pyracantha fortuneana is belonged to thermotaris type species of flies phenological phenomena. It was found that flowers Pimpinella diversifolia was the most attractive to the flies.

Soil Seed Bank

Zhang Zhiquan

1996, (6):  36-42. 

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Soil seed bank has generally been defined as the amount of viable seeds present in the soil of defined area. Soil seed banks have been studied in various ways in various habitats, including arable soil, pastures, natural forests, forest plantations, lake shores, freshwater tidal marshes, salt marshes, prairie glacial marshes, deserts. On the basis of studies on relationships between latitude and the number of buried seeds in the soil, is does not appear to be a latitudinal trend in density of the buried seeds. It is concluded that there are four types of seed banks (TypesⅠ-Ⅳ) and three kinds of seed banks(Types A,B,C) Which are similar basically according to some research data. In frequently disturbed habitats the species composition of the seed banks and vegetation was usually similar. As the vegetation matures, the disparity between these two increased. Aknowledge of the seed bank is of great value in the agriculture, forestry, conservation management and revegetation of mining wastelands.

A Preliminary Study on the Relationship Between the Environmental Evolution and the Human Activity in the Aibi Lake Area

Yang Yunliang, Yan Shun, Jia Baoquan, Chen Lijun

1996, (6):  43-49. 

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he Aibi Lake is an endorheic lake formed in the Himalayan Orogeny. According to the characteristics of evolution, its formation history can be classified into three periods: (a)Formation period; (b)Fresh water lake period;and (c)Salt water lake period. Based on the correlation analysis between the curve of area of Aibi Lake and the curve of water consumption by human activity during 1950-1995, the conclusion could be drawn that the water consumption of human activity was the direct cause of the decay of the Aibi Lake. And many of environmental problems as a chain reaction of the decay of the Aibi Lake were caused by the improper utilizing methods and greatly damaged the natural resources in the Aibi Lake Area.

Theoretical Analysis of Disturbance in Ecology and its Application

Wei Bin, Zhang Xia, Wu Refeng

1996, (6):  50-54. 

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he paper make a systematic exposition of concept, classification and characters of disturbance in ecology, and emphatically discussed about general theory and laws about disturbance in landscape ecolo-gy, including theory of Disturbance Hierarchies, principle of Disturbance Scale and law of spread of disturbance. Meantime, application of the theory of disturbance of vegetation systematic, ecological vulnerability and restoration ecology was dealt with.

Population Performances of the Sap Feeders under Low Nitrogen Stress of the Hosts and their Adaptation

Ma Jufa, Hu Guowen, Cheng Jiaan

1996, (6):  55-59. 

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he paper summarised the effects of low nitrogen stress of the hosts on population performances and adaptative strategies of sap feeders such as planthoppers and aphids (Homopter). The performances such as few colonised numbers, more of ten styles probing to plant surface, fast feeding rate, longer development duration and higher mortality at immature stages, increased macropters, shorter longevity and undeveloped gonad of sap feeders under nitrogen deficient of the host plants were observed. A variety of ecological and physiological adaptations were adopted by insects for buffering these worse habits, including increasing feed rate, dispersing to more nutritious host plant ,locating on nitrogen rich sites of the plant and modifying plant nutritional physiology.

Study of Morpho Physiological Strain of Rice Seedling Under Low Temperature

Li Taigui, Wang Lei

1996, (6):  60-62,49. 

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urvival rate, chlorophyll, dissoluble sugar and bound of rice seedling of different resistant variety were studied in terms of their strain value, velocity and acceleration.The results indicated that only downward constant strain acceleration existed in the survival rate and chlorophyll change,while both downward and upward varying strain acceleration were found in dissolvable sugar and bound water. It could be concluded that the strain pattern under low temperature was different for morphology (survival rate and chlorophyll)and physiology (sugar and water).

Introduction to a New Approach of Estimating the National Wealth

Cao Zhiping

1996, (6):  63-67. 

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new approach of estimating the national wealth proposed by the World Bank staff was introduced in the paper. According to the new approach, national wealth comprises produced assets, natural capital and human resources and each of these three categories is measured with monetary valuation. The percentage of three categories in total wealth was shown globally, and the difference of national wealth between developed countries and developing countries was also listed.

Ecology Towards 21st Century in China

Chen Tao

1996, (6):  68-70. 

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ustainable development is the mainstream in contemporary paradigm of development. Ecological Science, as one of the theoretical basis of sustainable development, is becoming one of the hot topic in the scientific community. However,what is the appropriate niche that this old and new branch should be put in a developing country like China? what challenges and tasks it will face in the next century? The theoretical points for further discussion are presented on the paper,1.To aim at the international fronties of ecology and to take parst in the globae plan of ecological environment researches. 2.To make contributions to our country's sustainable development of economy and society.

Ecological Civilization——the Human Future Civilization——Consideration about Humanbeing and Sustainable Development of Nature

Li Jianguo

1996, (6):  71-74. 

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The sustainable development is an important topic faced by humanbeing.Based on relationship between humanbeing and nature, the concept and meaning of ecological civilization was put forward in the paper.It is considered that the construction of ecological civilization is the main way to solve the problems of sustainable development. The methods to build ecological civilization were dealt with.

Explore the Way of Ecological Construction, Promote Social and Economic Development

Lu Qi, Huang Yuanchang

1996, (6):  75-78,74. 

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In recent years, Dafeng, as one of the earliest ECNC, paid much attention to the use of ecological research and coincided rural ecosystem with economic and social development. As the result,a new way for promoting coastal economic and social development has been formed .This article includes three parts: great achievements, features in ecological economy and enlightenment.