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[1]CHEN Jie,XIAN Wei,CHEN Chunrong.Temporal and Spatial Dynamics and Driving Factors of Vegetation NPP in Western Sichuan from 2000 to 2015[J].Research of Soil and Water Conservation,2019,26(05):137-143.

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Temporal and Spatial Dynamics and Driving Factors of Vegetation NPP in Western Sichuan from 2000 to 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 137-143 Column: Public date: 2019-09-06

Title:: Temporal and Spatial Dynamics and Driving Factors of Vegetation NPP in Western Sichuan from 2000 to 2015

Author(s):: CHEN Jie, XIAN Wei, CHEN Chunrong; Chengdu University of Information Technology, Chengdu 610041, China

Keywords:: net primary productivity; CASA model; western Sichuan; time and space change; driving factor

CLC:: TP79

DOI:: -

Abstract:: This study is aimed to estimate the net primary productivity of vegetation in western Sichuan and analyze its spatial-temporal pattern and the relationship between net primary productivity (NPP) of vegetation and its driving factors, which provided a theoretic basis for understanding the status of vegetation productivity in this area. Specifically, the followings were investigated. (1) based on the Original CASA model, the influence coefficient of water stress on regional actual evapotranspiration and potential evapotranspiration was improved, and the NPP of vegetation in western Sichuan from 2000 to 2015 was estimated. (2) A pixel-by-pixel trend method was used to analyze the spatial variation of net primary productivity of vegetation in western Sichuan during the study period. (3) The correlation analysis was conducted between meteorological factors, land use change, vegetation type, topographic factors and human activities and net primary productivity of vegetation. The results showed that the spatial variation of vegetation in western Sichuan was obvious with the average annual NPP of 199 gC/(m²·a); during the period 2000-2015, the NPP of vegetation in large areas increased significantly, while in some areas like Wenchuan, Luding, Jinchuan and Kangding, the values declined due to natural disasters and human activities; the meteorological parameters such as precipitation, temperature and solar radiation hadcertain influence on the spatial pattern of vegetation, causing the difference of NPP in area with different land uses and vegetation types; the correlation between altitude and NPP in the study area was highly significant (R²=0.896,p<0.001) and human activities had a significant negative influence on NPP in the areas such as Wenchuan and Luding.

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