Comparison of net primary productivity in karst and non-karst areas: a case study in Guizhou Province,China |
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| Authors: | Bing Wang Shengtian Yang Changwei Lü Jing Zhang Yujuan Wang |
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| Institution: | (1) Forestry College, Inner Mongolia Agricultural University, Hohhot, 010019, China;(2) School of Geography, Beijing Normal University, Beijing, 100875, China;(3) Department of Ecology and Environmental Science, Inner Mongolia University, Hohhot, 010021, China |
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| Abstract: | Green plants play an important role in energy flows and material cycles. The net primary productivity (NPP) reflects the capability
of vegetation to convert solar energy into photosynthate (fixed carbon). Understanding the factors that contribute to variations
in NPP is of key importance for improving the rock-desertification environment in karst areas. In this paper, the NPP model
(Light Use Efficiency model) is modified on the basis of remote sensing data moderate resolution imaging spectroradiometer
(MODIS)], climate data and observed information. Then the model is employed to estimate the spatial–temporal variations of
NPP in the Guizhou Province, China. Finally, the NPP differences between karst area and non-karst area, and the relationships
between NPP and climate factors are analyzed. The results show that the NPP estimated using MODIS data are reasonable. The
mean NPP of territorial vegetation is 421.46 gC m−2 year−1; the NPP in the non-karst area is 13.3% higher than that in the karst area; the correlation degree between NPP and precipitation
is better in southeastern and western districts. |
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