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《Acta Geographica Sinica》 2016-01
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Spatial and temporal variability of the net primary production(NPP) and its relationship with climate factors in subtropical mountainous and hilly regions of China:A case study in Hunan province

CHEN Xiaoling;ZENG Yongnian;School of Geosciences and Info-physics, Central South University;Center for Geomatics and Regional Sustainable Development Research, Central South University;  
In this study, we selected Hunan province as the study area. The vegetation NPP and its changes from 2000 to 2013 were calculated using improved Carnegie- Ames- Stanford Approach(CASA) model with MODIS- NDVI data at a 250 m × 250 m spatial resolution and meteorological data. Furthermore, we quantitatively analyzed the correlation between NPP and climate for various land-cover types so as to provide reliable information for local environment and sustainable development. The results indicate that:(1) The annual amount of NPP decreased from 41.62 Tg C/yr in 2000 to 125.40 Tg/yr in 2013, with an average being about86.34 Tg C/yr. In general, the total amount of NPP has decreased obviously since 2000, with an annual rate of about 2.70 Tg C/yr.(2) The annual NPP from 2000 to 2013 had significant spatial differences throughout the study area, decreasing from the southwest to the northeast.There were obvious differences over various vegetation divisions.(3) According to the changes rate of NPP from 2000 to 2013, the study area could be divided into five regions, namely,extremely remarkable increase rate(slope 0, p 0.01), remarkable increase rate(slope 0,0.01 ≤ p 0.05), unnoticeable rate(p ≥ 0.05), extremely remarkable decrease rate(slope 0,p 0.01) and remarkable decrease rate(slope 0, 0.01 ≤ p 0.05), which accounted for5.40%, 2.02%, 61.64%, 16.79% and 14.15%, respectively. In general, NPP decreased from2000 to 2013 over different land- cover types, among which, the most significant change took place in grassland and forestland, followed by other types of land, construction land and farmland.(4) The spatial distribution of NPP had higher correlation with precipitation than with temperature.
【Fund】: 国家自然科学基金项目(41171326 41201386);; 中南大学中央高校基本科研业务费专项资金(2015zzts254)~~
【CateGory Index】: Q948
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