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Su X.-M.,Beijing Forestry University | Wang W.-K.,Beijing Forestry University | Li Y.-W.,Beijing Forestry University | Sun W.-X.,Beijing Forestry University | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2010

Biomass resources have the characteristics of widespread and dispersed distribution, which have close relations to the environment, climate, soil, and land use, etc. Geographic information system (GIS) has the functions of spatial analysis and the flexibility of integrating with other application models and algorithms, being of predominance to the biomass energy source research. This paper summarized the researches on the GIS applications in biomass energy source research, with the focus in the feasibility study of bioenergy development, assessment of biomass resources amount and distribution, layout of biomass exploitation and utilization, evaluation of gaseous emission from biomass burning, and biomass energy information system. Three perspectives of GIS applications in biomass energy source research were proposed, i. e., to enrich the data source, to improve the capacity on data processing and decision-support, and to generate the online proposal.

Zhang X.,Beijing Forestry University | Zhang H.-L.,Beijing Forestry University | Wang Y.-J.,Beijing Forestry University | Wang Y.-Q.,Beijing Forestry University | And 3 more authors.
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2016

Using Granier-type thermal dissipation probes, we monitored sap flux density (Fd) of three species (Cunninghamia lanceolata, Pinus massoniana, and Symplocas setchuensis) in August and September during 2012-2015 in Jinyun Mountain of Chongqing, southwestern China. Solar radiation (ES), atmospheric temperature (T), atmospheric relative humidity (RH), wind speed (W), vapour pressure deficiency (VPD) and soil water content (SWC) synchronously with Fd were monitored by mini weather station. Sunny day, cloudy day and rainy day were chosen as three typical weather conditions. We aimed to analyze the differences and characteristics of sap flow among three species and among the three typical weather conditions, and to clarify the relationship between Fd and meteorological factors. The results showed that water transpiration ability of xylem for the three species was ranked as S. setchuensis > P. massoniana > C. lanceolata. Transpiration velocity of broadleaf species was higher than that of coniferous species. The variations of Fd for the three species all displayed single-peaked curves. S. setchuensis was the first one to start transpiration and reach the peak value of Fd, while C. lanceolata was the last. Sap flow for the three species under different weather conditions followed the order of sunny day >cloudy day > rainy day. Compared with sunny day sap flow, the extent of sap flow decreased on cloudy and rainy days ranged from 41% to 86%. The order of contribution rate of diurnal sap flow to whole day transpiration was sunny day (94.74%-98.04%) > cloudy day (93.63%-96.71%) > rainy day (81.43%-85.43%), and that of nighttime sap flow contribution was rainy day (14.57%-18.27%) > sunny day (3.29%-6.37%) > cloudy day (1.96%-5.26%). SWC was the major factor affecting the nighttime sap flow contribution on rainy days. ES and VPD were major meteorological factors affecting Fd. W, T and RH had little effect on Fd, and there were some differences among these three species. The regression models to relate Fd with meteorological parameters can well explain the changes of sap flow, in which coefficients of determination were 0.873, 0.873 and 0.903. © 2016, Beijing Forestry University. All right reserved.

Ma Q.,Chinese Academy of Forestry | Cui L.,Chinese Academy of Forestry | Song H.,Chinese Academy of Forestry | Zhang M.,Chinese Academy of Forestry | And 2 more authors.
Wetlands Ecology and Management | Year: 2015

Unsustainable use and inappropriate management of wetlands has a wide range of consequences for humans and the environment. These include the loss and degradation of wetland ecosystems with detrimental effects on species survival, water-storage capacity, and enhance the risk of decreased ecological functions. As the human population continues to grow, these problems are likely to increase in severity. To date, there are no law specifically designed to protect Beijing wetlands; existing regulations only relate to one or a few of the elements of wetlands. However, there has been great effort toward the establishment of legislation and a legal document is expected to be released in the near future. In this paper, we focus on the main obstacles in Beijing wetland protection and management. Defects and deficiencies of existing regulations as well as methods for the protection and management of specific wetland elements are discussed. Some suggestions about the Beijing wetland protection legislation are provided. Each component of relevant wetland research is reviewed and related to wetland management and policy. © 2013, Springer Science+Business Media Dordrecht.

Zhu J.-G.,Beijing Forestry University | Yu X.-X.,Beijing Forestry University | Gan J.,Beijing Municipal Bureau of Landscape and Forestry | Zhang Z.-M.,Beijing Forestry University
Chinese Journal of Ecology | Year: 2010

Ecologists have not reached a consensus on the major issues in ecosystem health. In this, paper three concepts relating to ecosystem health, i. e. health, system and ecosys-tem, were analyzed, and the concepts and connotations of ecosystem health, its research signifi-cances, content framework, and feasible scales » as well as the diagnosis and grade-assessment of ecosystem quality were discussed. It is suggested that ecosystem is one of the special systems in the context of systems science » with the characteristics of integrity, stability » and sustainability. Good integrity, stability, and sustainability are the necessary and sufficient conditions of ecosystem health. The criteria of ecosystem quality include qualitative diagnostic and grade-as-sessment ones. The qualitative diagnosis is a fact judgment (yes or not), while the grade-assess-ment is a value judgment. The indices for grade-assessment of ecosystem quality could also be di-vided into two kinds, the restrictively comparable and the non-restrictively comparable. The com-plexity of ecosystem determines that the studies on ecosystem health should be made with the help of the theories and methods in systems science and nonlinear science, the time lag in ecosystem disease determines that the forecast and early warning of ecosystem health should be strength-ened » and the transdisciplinarity of ecosystem health research determines that the reseds needs a broad cooperation among ecological, environmental, medical, social, and economic scientists.

Wu S.,Chinese Academy of Forestry | Hou Y.,Chinese Academy of Forestry | Yuan G.,Beijing Municipal Bureau of Landscape and Forestry
Unasylva | Year: 2010

A study was conducted to evaluate forest ecosystem goods and services and forest natural capital of the Beijing municipality, China. Forest land, one of the most important economic assets, is generally valued on the basis of market transactions, either directly or as property. A simple stumpage value method was used for the valuation of standing timber. Stumpage prices by species and diameter were taken area and in southern China. Estimates of forest carbon stock and stock changes were calculated based on growing stock and net increment using the biomass expansion factors (BEF) of the Intergovernmental Panel on Climate change. The value of forest carbon stock assets was calculated by multiplying forest carbon stock by the carbon price derived from the Badaling forest farm carbon project in Beijing, China. Estimation of the full range of values from forests is helpful in designing forest management strategies.

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