AI Article Synopsis
- The study analyzed the vegetation net primary production (NPP) in Yellow River watersheds using MODIS-NDVI imagery from 2001 to 2010, employing the CASA model for calculations.
- The research showed that vegetation NPP decreased from northwest to southeast across the region and had an average annual NPP of 108.53 Tg C, correlating significantly with land cover types.
- While NPP generally increased over the decade, its relationship with climate factors was complex, indicating varied monthly correlations, with temperature and precipitation impacting different ecosystems differently over time.
Article Abstract
Based on the MODIS-NDVI remotely sensed imagery, this paper analyzed the spatial distribution of vegetation net primary production (NPP) calculated by CASA model in Yellow River watersheds from 2001 to 2010. Associated with the temperature and precipitation data in the same period, this article respectively analyzed the change trends of vegetation NPP in six ecosystems with different spatial and temporal scales, and the relationship between NPP and climate factors. The results indicated that in terms of spatial scale, the vegetation NPP gradually reduced from northwest to southeast, the average of annual NPP was 108.53 Tg C, and the spatial distribution of vegetation NPP was highly related with the land cover types. In terms of temporal scale, the vegetation NPP gradually increased from 2001 to 2010, but this change trend had large differences in these regions. On annual level, the vegetation NPP had no significant correlation with climate factors, but precipitation and temperature had considerable impacts on the vegetation NPP on monthly level. The correlations between NPP and climate factors were different in different ecosystems, so did the time lag effect of the climate factors. The air temperature response of the NPP variation was relatively sensitive in forest ecosystem and the precipitation response was significant in grassland and wetland ecosystems. Additionally, the precipitation response of the NPP variation in grassland ecosystem had time lag effect and so did the air temperature response in desert ecosystem.
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