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| Spatial-temporal Characteristics of the Vegetation Net Primary Production in the Qinghai Lake Basin from 2000 to 2012 |
| Zhang Tao1,2, Cao Guangchao1,2, Cao Shengkui1,2, Chen Kelong1,2, Shan Zhongxue1, Zhang Jing1 |
1. College of Life and Geographical Science, Qinghai Normal University, Xining 810008, China;
2. Qinghai Province Key Laboratory of Physical Geography And Environmental Process, Qinghai Normal University, Xining 810008, China |
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Abstract Using the meteorological data and MODIS data, the CASA model and Geographic Information System were applied to analyze the NPP change in the Qinghai Lake Basin during 2000-2012. The results showed that the annual NPP was 4.77×1012 gC·a-1, and spatially, NPP distribution from low to high in a ring-shaped around the Qinghai lake, and showed a decrease trend from southeast to northwest, the highest NPP was 374.19 gC·m-2·a-1 in the middle region of the Qinghai Lake north river. The inner-annual variation of NPP was obvious and an periodicity increasing tendency with a mean change rate of 4.81×1010gC·a-1 could be seen from 2000 to 2012; The NPP changed significantly in a year, July had the highest NPP account 28.77%. Most parts of Qinghai Lake Basin had an increase in total NPP , the significant increase area mainly distributed around the Gong He county in Jiang Xi-gou town, Shi Nai-hai town and Tian Jun county, expect the upstream of the Ha Er-gai river and the midstream of the Sha Liu river were the mainly decrease region. Multiple regression analysis showed that NDVI and precipitation were the main factors influenced the NPP in the Qinghai Lake Basin.
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Received: 17 April 2014
Published: 20 July 2015
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2015, Vol. 35 
