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| Spatial and Temporal Pattern of NPP and Its Relationship with Climate Factors in Tibet, China |
| Bianduo1, Yang Xiuhai1, Pubuciren1, Luobu1, Jilv2, Liu Kuijun2 |
1. Tibet Institute of Plateau Atmospheric and Environmental Science, Lhasa 850001;
2. Ali Meteorological Bureau, Ali 850006 |
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Abstract Based on MOD17A3 NPP remote sensing data and meteorological data such as temperature, precipitation, the spatiotemporal distribution and variation characteristics of vegetation net primary productivity (NPP) and their relationships with climate factor was studied in Tibet from 2000-2012 by using of GIS and statistical methods. The results show that the NPP of vegetation in Tibet varies from 119.3 to 148.4 gC·m-2·a-1, with an average of 135.2 gC·m-2·a-1; anomaly analysis shows that the NPP was not significant upward trend in recent years, and its value is gradually decreasing from the southeast to the northwest on the whole based on the Tibet. The NPP slightly increases for almost 10.70% and remain unchanged which occupied 61.11% of total region during the past 13 years. Considering the NPP of different vegetation types, broadleaved forest has the largest value ranging from 1 185.2 gC·m-2·a-1 to 1 430.2 gC·m-2·a-1, then mixed forest with varies from 535.1 gC·m-2·a-1 to 741.2 gC·m-2·a-1, followed by savannas, coniferous forest, farmland, grassland and shrub. The NPP over Tibet has a better positive and negative relation with the annual mean temperature and the annual precipitation respectively. All vegetation types were positively correlated with mean annual temperature, which grassland NPP and the average annual temperature correlation coefficient of 0.88, followed by coniferous forest was 0.76, the worst correlation is savanna(r=0.13). The correlation analysis indicates that the NPP of different vegetation types are negatively related to the annual precipitation except the NPP of savanna (r=0.26), where the grass maximum correlation coefficient (r=-0.79), followed by coniferous forest (r=-0.73).
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Received: 18 February 2014
Published: 20 May 2015
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2015, Vol. 35 
