| Technology Application |
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Land cover change and its impact on net primary productivity in China's typical temperate grassland system in the past 25 years: A study of the Huangfuchuan Watershed |
| XU Jiren1,2, DONG Jihong1,2, YANG Hongbing1,2 |
1. College of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China;
2. Jiangsu Key Laboratory of Resources and Environmental Information Engineering, Xuzhou 221116, China |
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Abstract In this paper, the Huangfuchuan Watershed was chosen as the study area, and RS and GIS techniques were used to explore the land use change and NPP. With the combination of CASA model, the dynamic characteristics of NPP in 1987—2011 were studied. Land use structure changed obviously in the Huangfuchuan Watershed. The main trend of land use change was the gradual increase of construction land and woodland as well as the gradual decrease of water. The areas of arable land, grass, shrub, bare rock and sand were fluctuant, as shown by land use dynamic degree. The calculation of NPP model shows that the total value of NPP in 1987, 1995, 2000, 2007 and 2011 was 28.12 GgC, 53.47 GgC, 73.23 GgC, 157.92 GgC and 78.52 GgC. The analysis of land use change effects on NPP indicates that the main factor responsible for the increase of NPP was the transformation of the grassland to the shrub between 1987 and 1995, whereas the bare rock was the main factor responsible for the increase of NPP in 1995—2000. The change of shrub into grassland contributed mainly to the increase of NPP in 2000—2007, whereas the change of grassland into shrub contributed mainly to the reduction of NPP in 2007—2011. The results of the study is of great significance for rational utilization of temperate grassland resources and improvement of the fragile ecological environment.
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| Keywords
aerosol type
aerosol optical thickness(AOT)
water vapor content(WV)
hyperspectra
atmospheric correction
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Issue Date: 02 March 2015
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2015,
Vol. 27
