Spatiotemporal Change and Associated Driving Forces of Vegetation Net Primary Productivity in the Loess Plateau during 2001-2013
Based on the Carnegie-Ames-Stanford-Approach (CASA), the Net Primary Productivity (NPP) of vegetation in the Loess Plateau during 2001-2013 was measured and calculated with the related remote sensing data, meteorological data and basic geographic data.The temporal and spatial variation characteristics of NPP in the Loess Plateau during 2001-2013, the future trend and its driving factors were analyzed.The results showed that:The average annual NPP of vegetation in the Loess Plateau increased significantly during 2001-2013, with an annual growth rate of 4.9 g/(m2·a).The spatial distribution of vegetation NPP in the Loess Plateau showed a significant trend, with a decreasing tendency from southeast to northwest.The area of improved and degraded NPP accounts for 78.0% and 22.0% of the total study area, respectively.The NPP of the vegetation in the study area was supposed to have a significant positive trend, the area of positive and reverse characteristic accounts for 72.1% and 28.9% of the total study area, respectively.There was no significant correlation between the NPP change and the precipitation as well as the air temperature in the Loess Plateau.The human activities were the core elements affecting the change of the vegetation NPP, leading to both negative effect and positive effect.
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