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Effect of acidic deposition on productivity of forest ecosystem and estimation of its economic losses in southern suburbs of Chongqing,{2.

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Journal of environmental sciences 1998年第2期10卷 83-88页

作者： Wu Gang department of systems {2., research center for eco environmental sciences, chinese academy of sciences, Beijing 100085, china department of systems {2. Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

In accordance with principles and methods of ecology, the effects of acidic deposition on productivity and volume increment of masson pine and Cinnamomum campora forest which are widely distributed in southern suburbs of Chongqing, china were studied. Based on the field data and measurements, a multivariable stepwise regression model was established to analyze the effects of multiple {2. factors on the productivity of the forest ecosystems. This model was used to assess the volume and economic losses of these two forest ecosystems caused by acidic deposition. The result showed that, among the {2. factors, pH value of precipitation, soil depth, soil organic contents and slope are the dominant ones influencing the growth of masson pine forest. It was also shown that the acidic deposition has no clear relation to the growth of *** forest, so development of such broad leaved forest is suitable in the area.

关键词： acidic deposition productivity volume increment economic loss.

Effects of elevated CO_2.on growth and carbon partitioning in rice

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chinese science Bulletin 1998年第23期43卷 1982-1986页

作者： LIN Weihong\+1 and WANG Dali\+2.1. department of Plant Nutrition, china Agricultural University, Beijing 100094, china 2. department of systems ecology, research center for eco_environmental science, chinese academy of sciences, Beijing 100085, china department of Plant Nutrition China Agricultural University Beijing China department of systems {2. Research Center for Eco-Environmental Science Chinese Academy of Sciences Beijing China

Rice (\%Oryza sativa\% cv. Jindao 1187) was grown in open_top chambers which contained ambient and enriched CO\-2. CO\-2.elevation stimulated rice tillering during early vegetative stage. However, panicle dry weight per plant did not change at maturity stage. Root biomass was enhanced by high CO\-2. Root / shoot ratio was increased under high CO\-2.at maturity, indicating more carbon allocation to the below_bround part in rice under high CO\-2.

关键词： CO 2 elevation growth carbon partitioning rice (\%Oryza sativa cv\%. Jindao 1187).

Exploiting pattern and sustainable development of marginal lands in the Three Gorge Reservoir Areas

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Journal of environmental sciences 2001年第2期13卷 173-179页

作者： WU Gang, LI Jing, KONG Hong mei, ZHAO Jing zhu, GAO Lin (department of ecology System, {2. center for eco environmental sciences, chinese academy of sciences, Beijing 100085, china) department of ecology System Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China.

This paper studied the distribution and utilization status, reasonable exploitation patterns and potential productivity, and sustainable development of marginal lands in the Three Gorge Reservoir Areas. It has been pointed that problems of the soil fertility degradation, poor productivity in crop lands, natural disasters and environmental deterioration existed in all the exploited marginal lands. In order to maintain the sustainability of the marginal lands, following measure have been proposed: prohibiting cultivation in the crop lands with a slope more than 2.°, restoring vegetation in the slope more than 2.°, strengthening the basic agricultural construction, establishing the production base of woody feeds and oils, establishing a multi dimensional management model with reasonable structure and optimum function for forestry, agriculture and fishing.

关键词： marginal lands utilization pattern sustainable development Three Gorge Reservoir Are4

Nitrogen, phosphorus and potassium recycling in an agroforestry ecosystem of Huanghuaihai Plain: with Paulownia elongata intercropped wheat and maize as an example

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Journal of environmental sciences 1998年第2期10卷 62-69页

作者： Wu Gang department of systems {2.,research center for eco environmental sciences, chinese academy of sciences,Beijing 100085,china

The studies show that in the whole community, P is deficient, and N and K are basically balanced. N, P and K are accumulated in plant tissues and litters, but depleted in soil. N and P contents in surface soil(0—2. cm) are the main factors affecting crop growth, and P contents in 2. 80 cm soil layer is the major affecting Paulownia elongata growth. The absorption coefficients of N, P and K in the communities are 0 078, 0 014 and 0 052.respectively, their utilization coefficients are 0 95, 0 90 and 0 94, and the recycling coefficients are 0 042. 0 05 and 0 063 respectively.

关键词： nitrogen phosphorus, potassium recycling agroforestry ecosystem.

ecological rebuilding and land reclamation in surface mines in Shanxi Province, china

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Journal of environmental sciences 2000年第4期12卷 486-497页

作者： MIAO Ze wei 1, BAI Zhong ke 2. GAO Lin 1 (1. research center for {2. environmental sciences, chinese academy of sciences, Beijing 100085, china E\|mail: miaozewei@*** 2. department of Soil science, Shanxi Agricultural University Taigu, 03 中科院生态环境研究中心北京 1 0 0 0 85 山西师范大学山西临汾 0 3 0 80 1

It is well known that the mining industry produces a large amount of derelict land, and causes pollution of water loss and soil erosion as well as other environmental damage in china. As land is under pressure in china, it is now policy to restore or reclaim land despoiled by mining, the aim being to develop sustainable and healthy arable land ecosystems. This paper outlines the principles and approaches of ecological restoration, which have been adopted in Shanxi Province with reference to three typical surface mines. In the research, the principles of ecological engineering and ecological succession are considered as the critical theories of ecological restoration in mine degraded land. Meanwhile, the paper made a comparative research on main links of ecological rebuilding in three surface mines in Shanxi Province, which include new land construction, treatment of toxic substances, control of soil erosion, fertility management, irrigation, ecological planning and the establishment of legislation systems. As the research demonstrated, for successful restoration, new land construction is the fundamental framework, but it must be integrated with ecological engineering including ecological planning, the control of soil erosion and vegetation establishment and ecosystem creation in order to optimise land productivity and soil fertility. In addition, the establishment of the legislation systems and organization of administration are also indispensable aspects of ecological rebuilding in mined land.

关键词： ecological restoration land reclamation open-pit mine

Modeling diameter distribution of the broadleaved-Korean pine mixed forest on Changbai Mountains of china

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science china(Technological {2.) 2006年第z1期49卷 177-188页

作者： WANG Shunzhong, DAI Limin, LIU Guohua, YUAN Jianqiong, ZHANG Hengmin & WANG Qingli Institute of Applied ecology, chinese academy of sciences, Shenyang 110016,{2. Graduate University of chinese academy of sciences, Beijing 100039,{2. State Key Lab of systems ecology, research center for eco-environmental sciences, chinese academy of sciences, Beijing 100085,{2. Institute of Applied ecology Chinese Academy of Sciences Shenyang 110016 China Graduate University of chinese academy of sciences Beijing 100039 China State Key Lab of systems ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

The broadleaved-Korean pine mixed forest is a native vegetation in the Changbai Mountains, northeast china. The probability density functions including the normal, negative exponential, Weibull and finite mixture distribution, were used to describe the diameter distributions of the species groups and entire forest stand. There is a strong correlation between parameters and mean DBH except the shape parameters in the mixture distribution. The diameter classes of species and entire forest stand showed not negative exponential but normal and "S" distribution. The mixture function was better than normal and Weibull to describe the model distribution. The location parameter had an effect on the estimated frequency in the first diameter class, when the estimated location parameter was bigger than the lower limit of the first diameter class.

关键词： broadleaved-Korean pine mixed forest, diameter distribution, finite mixture distribution.

The roles of a decision support system in applying forest ecosystem management in Northeast china

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science china(Technological {2.) 2006年第z1期49卷 9-18页

作者： DAI Limin, ZHENG Bofu, Guofan Shao & ZHOU Li State Key Lab of systems ecology, {2. center for eco-environmental sciences, chinese academy of sciences, Beijing 100085, china Institute of Applied ecology, chinese academy of sciences, Shenyang 110016, china department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907, USA Graduate University of chinese academy of sciences, Beijing 100101, china 1. State Key Lab of systems ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China2. Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China3. Department of Forestry and Natural Resources Purdue University West Lafayette IN 47907 USA4. Graduate University of Chinese Academy of Sciences Beijing 100101 China

Forest ecosystems provide a variety of services and forest ecosystem management (FEM) is an effective approach to maximize the services. Because of the complexity of forest ecosystems, the applications of FEM can be facilitated with decision support systems (DSS) that recognize and incorporate ecological and socio-economic variables. With the rapid development of computation and information technologies, DSS have been advanced in many ways. Traditional forest management within a forestry unit in china is planned on a yearly basis. The planning itself remains primarily a verbal concept as there are no quantitative decision-support tools available to translate the concept into forest management actions. For the purposes of FEM at the management level, a forest management DFF, FORESTAR, has been developed under a framework of geographic information system (GIS) and forest models. The paper explained the intelligent modeling mechanisms and demonstrated how the applications of FEM can be strengthened with the applications of FORESTAR.

关键词： forest functions, forested landscapes, forest services, forest models, geographic information systems.

Towards Sustainable Urban environmental Management in Jiangyin city, East china

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chinese Journal of Population,Resources and Environment 2004年第3期2卷 50-56页

作者： Hu Dan, Wang Rusong & Yuan Shaojun department of the Key Lab of systems {2., research center for eco-environmental sciences, chinese academy of sciences, Beijing 100085, china department of the Key Lab of systems {2. Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Dramatic economic and social changes have taken place in Jiangyin city due to rapid and uneven urbanization and industrialization. The environmental degradation has followed driven by these changes since the 1980's. With the pressures and effects of environmental deterioration, the city has implemented environmental management to hold back the trends of negative environmental changes. From the viewpoint of systems, DPSER is a good model for urban environmental changes to understand the causes, pressure, state, effect, existing responses and future action strategies. We took Jiangyin city, a developed city in South Jiangsu province, East china, as an example, and analyzed the characteristics of environmental changes and urban responses using DPSER model. Some operational strategies have been put forward to direct the city environmental management towards a sustainable road step by step.

关键词： DPSER analysis model Jiangyin city in East china Sustainable environmental management Urbanization

Designing regional pattern for ecosystem restoration:A case study

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science china(Technological {2.) 2006年第z1期49卷 86-97页

作者： LI Guoqiang , MA Keming, FU Bojie & LIU Shiling State Key Lab of systems ecology, {2. center for eco-environmental sciences, chinese academy of sciences, Beijing 100085, china department of Water Environment, china Institute of Water Resources and Hydropower {2., Beijing 100038, china School of environmental sciences, Beijing Normal University, Beijing 100875, china 1. State Key Lab of systems ecology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China 2. department of Water Environment China Institute of Water Resources and Hydropower Research Beijing 100038 China 3. School of environmental sciences Beijing Normal University Beijing 100875 China

Designing regional pattern is challenging for ecosystem restoration both in theory and in practice. The present study proposed a new approach to design regional pattern for ecosystem restoration with a case in the arid valley of Upper Minjiang River, SW{2.. The procedures are: (1) Determine the regional pattern of main environmental factors based on the relationships between the important environmental factors and the main geographical factors generated from DEM data. (2. Overlay the maps of the main environmental factors. (3) Generate a lookup table according to the species selection rule we proposed to link the candidate restoration species to the main environmental factors.(4) Determine the regional pattern of ecosystem restoration by positioning the restoration species in the map of environmental factors according to the lookup table. The regional restoration pattern designed in this way would be applicable not only to restoring a region, but also to predicting the future landscape change.

关键词： environmental factors, GIS, restoration species, Upper Minjiang River Valley.