The Effects of Urbanization on Net Primary Productivity in Southeastern China |
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Authors: | Dengsheng Lu Xiaofeng Xu Hanqin Tian Emilio Moran Maosheng Zhao Steven Running |
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Institution: | (1) Anthropological Center for Training and Research on Global Environmental Change (ACT), Indiana University, Bloomington, IN 47405, USA;(2) Ecosystem Dynamic and Global Ecology Laboratory, School of Forestry and Wildlife Sciences, Auburn University, 602 Duncan Drive, Auburn, AL 36849, USA;(3) International Center for Climate and Global Change Research, Auburn University, 602 Duncan Drive, Auburn, AL 36849, USA;(4) Numerical Terradynamic Simulation Group, University of Montana, Missoula, MT 59812, USA |
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Abstract: | Net primary productivity (NPP) is one of the major ecosystem products on which human societies rely heavily. However, rapid
urban sprawl and its associated dense population and economic conditions have generated great pressure on natural resources,
food security, and environments. It is valuable to understand how urban expansion and associated demographic and economic
conditions affect ecosystem functions. This research conducted a case study in Southeastern China to examine the impacts of
urban expansion and demographic and economic conditions on NPP. The data sources used in research include human settlement
developed through a combination of MODIS, DMSP-OLS and Landsat ETM+ images, the annual NPP from MODIS, and the population
and gross domestic product (GDP) from the 2000 census data. Multiple regression analysis and nonlinear regression analysis
were used to examine the relationships of NPP with settlement, population and GDP. This research indicates that settlement,
population and GDP have strongly negative correlation with NPP in Southeastern China, but the outcomes were nonlinear when
population or GDP reached certain thresholds. |
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