Table of Content

10 April 1996, Volume 15 Issue 02

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Analysis of the Time-specific Mortality of Cotton Aphid( Aphis gossyp ) Population

Ge Feng, Ding Yanqin

1996, (2):  1-3. 

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Based on the biology of cotton a phid and demogr aphic theory, a model for estimating the time -specific mortality to overlap generation insects was established, the population dynamics of cotton aphids were appr aised in this paper .

Biomass and Productivity of Beef wood Shelter Belt in Pingtan Island, Fujian

Huang Yixiong, Sha Jiqin, Xie Jiaoru, Fang Zuguang, Zheng Daxian

1996, (2):  4-7,14. 

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The paper determined the biomass and the productivity of Beefwood ( Casuarina equisetifolia) shelter belt in Pingtan island, Fujian, by investigating the tree layer and the litter layer using the method of stadard tree within stem step.According to the materials,we established the regression model for single tree's various organ's dry weight from Beef wood shelter belt.The relationship appeared very significant.The paper also studied the biomass distribution, struture, and increasing trends and judged the ecosystem quality and productivity of the shelter belt . The result showed that the average biomass in Beefwood shelter belt was 141.17t·ha^-1, and the annual net primary productivity was 24～396t·ha^-1, in which the stem's biomass accounted for 61～8percent of the total output mass of the tree,the root biomass was 19.02pecent,and the leaf was 7.74percent.

Economical Loss Resulted from Pollution in Xiaoqing River, Shandong

Tian Jiayi, Dou Hongyun, Zhuang Huiping, Zhang Xianngdong, Gu Fengtian

1996, (2):  8-14. 

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Based on three years of scientific observation, qualitative and quantitative investigation and monitoration of the destruction by pollution in the Xiaoqing river, using the principle of ecological economics, aseries of constructure systems of ecological destruction levels, index systems and mathematical models was constructed, ecological loss was thus converted to economic loss, and strategic measures in ecological construction were produced.

A Comparative Study of the Colony Structures in High-Yield Wheat Field

Zhang Qinghui, Xu Budong

1996, (2):  15-20. 

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This experimental study dealing with the colony structure in high-yield wheat field is especially focused on two aspects. One is the relation among the colony development, number of stool shoots and number of spikes. The other is regulation and development trend of the use of solar energy and component part of the yield.

The Influences of paulownia-wheat Intercropping on Physiological Reaction and Growth Wheat

Jing Yuanshu, Wu Yunying

1996, (2):  21-24. 

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Data collected were analysed to evaluate effects of paulownia-wheat inter cropping on physio-logical reaction. It was found that the resistance of wheat in the noon in the intercropped fields was less than that in the control plots. Average photo synthetic rate of wheat both at the edge of tree and the middle of tree rows was increased by 8% or so compared to the control plots at middle filling stage of wheat. Increasement of photosynthetic rate and lengthenment of photo synthetic time were important reasons resulting in the ries of wheat biomass and average product. Wheat transpiration rate was decreased and water use efficiency ( WUE)was higher in the intercropped fields so that the harm of dryhot wind was lightened.

Minimum Viable Population ——A Basic Theory of Conservation Biology

Xu Hongfa, Lu Houji

1996, (2):  25-30. 

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Conservationists maintaining the health and diversity of natural systems by protecting habitats is becoming increasingly difficult and sophisticated because of the grow ing of human population. To solve this problem, minimum viable population( MVP), a new theory, has been established. This theory focuses on the minimum conditions of the viability of species. The concept of MVP, determining method of MVP, and application in wildlife conservato in were discussed in this paper .

The Ecological Connotation of Sustainability Concept and its Implication for Human Development

Hu Dan

1996, (2):  31-36. 

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This paper examined the historical development of the“sustainability”concept and compared difference of“sustainability”concepts in the different contexts of disciplines, scales, and human develo pmental values, which presents some diversified no thional partialities. In contrast with such ex isting partialities. the auther expressed an ecological definition of“sustainalibity”concept from aholistic human ecological point of view . Based on such an integrative connotation, an alternative holistic model of sustainability——ecological development, was putforward, which strongly under lined human sustainable survival and development .

Tourist Ecology and Sustainable Development of Tourist Destinations

Wu Bihu

1996, (2):  37-43,54. 

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"As a kind of tourist product, ecotourisnl is supplied and preserved by destination area at where there is less disturbance to environment by humans, and is purchased and experienced by tourists who live in a different ecosystem. Tourist ecology is a subject to study how a destinntion area can suypply ecotourism products to the mnrket in a sustninable wny. It includes three main fields as the following: (1) Impncts on ecosystems by activities of tourists nnd destination developers and managers; (2) 1)estination environment's influence on tourist activities; and (3) Applied tourist ecology, consists of ecological development and management of tourist region, ecological management and education to toursts in destination area, and the way of sustainable development of area."

The Change of Salinized Soil and Some Counter measures by Ecology Control in the Western Plain area of the Northeastern China

Wang Chunyu, Wang Ruyong

1996, (2):  44-48. 

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For nearly 40 years, soilsa linization, situated in a ridland of natural grass and farming-pas to ralzigzag in the western pla in area of the Northeast China, has been becoming worse and worse. Its area has gone up from 496 million hectare in 1950s to 601 million hectare in 1980s, increased by 21 percent. Soil productivity has been generaly dropped. Correspondly, eco tope of saline land has worsened. Main ways of ecology control and reconstruction are follow : (1)making a thorough investigation of resources and a good job of lands use plan; (2) planting grass and deciding the amount of husband ary by grass; (3) building water conservancy project and planting rice for combating alkalinity; (4)planting forests and puting up green shield; (5) carrying out dynamic watch and forecasting evolution trend of soil salinization.

Application of Stable Carbon Isotope Technique in Plant Physiological Ecology Research

Jiang Gaomin

1996, (2):  49-54. 

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Stable carbon isotope technique has been playing many roles in the research of plant physio-logical ecology and global change ecology . For example, δ13C in leaves of some species is characterized with a certain photosynthesis pathway, or has some close relation with water use efficiency (WUE) . The δ13C recorded in tree righs can also be used to indicate the past climate changes. The fractio nation of δ13C from atmosphere to plants and the method for determining this value as well as some applications of such technique were briefly introduced in this paper .

Amelioration of Soil media During Vegetative Rehabitation in the Mining Wasteland

Lan Chongyu, Shu Wensheng

1996, (2):  55-59. 

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The key problem from revegetation in mining wasteland is the amelio ration of soil media.Many materials, such as FeSO 4, ED TA, Ca^{+ +}, chemical fertilizers, sewage sludge, refuse compost, animal manure, peat, grenn fertilizers, and nitrogen fixing plants etc. have been widely applied for the purpose. this paper gave a review of the properties of variou sameliorative materials, their effects and related application measures.

Comparisons of Leymus Chinensis'Characters in Differents Habitats in the Inner Mongulian Plateau

Ren Wenwei, Zheng Shizhang

1996, (2):  60-63,67. 

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Leymus chinensis can grows in different typical steppe in the Inner Mongolian Plateau. In the same season, we invested and contrasted different typical Leymus chinensis which grows in different regions, such as desert grassland, typical grassland and meadow grassland etc. The number of leaves was basically stable, whereas heigh of plant, length of leaf, width of leaf,leng th/ width of leaf, dry weight per m2 and their energy value etc. Were all increased with the increase of precipitation from west to east . In order to protect the resource of grassland,we must attach importance to the practical productivity of the grassland, as well as area of grassland, when we estimate the maximum capacity of carring livestock on grassland.

Analysis of Adaptation of Eucommia ulmoides Introduced Into Shangdong

Wang Huatian, Xu Jianguo, Han Jun, Ni Xuewen

1996, (2):  64-67. 

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Shandong province is located at 34°25′～38°23′N and 114°36′～122°43′E . It is typical continental monsoon climate, with absolute minimum temperature of -11～-25℃ and maximum of 39～43℃, annual precipitation of 550～950 mm and frostless days of 180～220day. The main soil kinds are braw nealth, cinnamon and saline alkli. Annual growth of breast-height diameter and length for younger trees of introduced Eucommia ulmoides are ≥1.00cm and ≥0.80m; for the mature trees are≥0.56cm and≥0.35m, respectively . The seed yield is 41g for 13 years old tree and 2500g for 23 years old tree. Seed quality is good with thousand-seeds weight of 97.0g and germination rate of 60%～80% .The growth charact eristics and barkg rowth of introduced trees are similiar to ones of the originated trees, while seed yield and quality are better than ones of originated trees.

A Grey Evaluation Model of lake Eutrophication and its Application

Feng Yuguo

1996, (2):  68-71. 

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According to the principle of the grey correlation analysis, a grey evaluation model of lake eutrophication was established by constructing objective function with extension principle of minimum square. Eighteen lakes of china were evaluated by this model.

Investigation and Some Considerations on the Development of Ecological Agriculture in Songzi County

Xiong Bangwei

1996, (2):  72-76. 

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In this paper the starting, operating and developing of ecological agriculture in Songzi, Hubei province, were analyzed and summaized theoretically from the point of strategy, and three conclusions were derived. In decision making, ageneral development strategy, i. e, individually planning for mountain areas, hilly lands, and flatlands: exploiting hilly lands, courtyards,and farmland; combining economic, ecological, and social benefits, was setup. In operating,three ecological economic zones, i. e, hilly lands, courtyards, and farmlands, were generated under the general strategy. In development, the purpose was to establish an ecological economic system with complex components, and the purpose was ensured by a group of engineering programs.