Study on spatio-temporal dynamics of vegetation carbon use efficiency and its response to climate factors in Three-River Headwaters Region
ZHENG Fei-ge1, YI Gui-hua2, ZHANG Ting-bin1,3, LI Jing-ji4,5, BIE Xiao-juan1, LIU Dong1, QIN Yi1, ZHANG Tian-tian1
1. College of Earth Science, Chengdu University of Technology, Chengdu 610059, China;
2. College of Management Science, Chengdu University of Technology, Chengdu 610059, China;
3. The Engineering & Technical College of Chengdu University of Technology, Leshan 614000, China;
4. College of Environmental and Civil Engineering Institute, Chengdu University of Technology, Chengdu 610059, China;
5. Institute of Ecological Resource and Landscape, Chengdu University of Technology, Chengdu 610059, China
Based on MODIS Gross Primary Production (GPP)/Net Primary Production (NPP) data, the carbon utilization efficiency (CUE) of vegetation in Three-River Headwaters region was calculated. Combined with the meteorological data and elevation data, the spatiotemporal distribution characteristics of vegetation CUE were investigated from 2001 to 2017 with the linear regression method. The response of vegetation CUE to air temperature, precipitation and evapotranspiration in the study area were further analyzed by using the methods of correlation analysis. The results showed that:(1) the vegetation CUE in the Three-River Headwaters region was first increasing and then decreasing with the peak in June during the active period between March and October each year from 2001 to 2017. (2) The annual vegetation CUE in the Three-River Headwaters region was ranging between 0.73 and 1.00, with an average of 0.85. Spatially, the vegetation CUE was higher in the north and west, but lower in the south and east in the study area. (3) The vegetation CUE was found to be positively correlated with air temperature, but negatively correlated with precipitation and evapotranspiration between April and October. On an annual basis, the CUE was more sensitive to precipitation than air temperature, but least sensitive to evapotranspiration.
郑飞鸽, 易桂花, 张廷斌, 李景吉, 别小娟, 刘栋, 覃艺, 张甜甜. 三江源植被碳利用率动态变化及其对气候响应[J]. 中国环境科学, 2020, 40(1): 401-413.
ZHENG Fei-ge, YI Gui-hua, ZHANG Ting-bin, LI Jing-ji, BIE Xiao-juan, LIU Dong, QIN Yi, ZHANG Tian-tian. Study on spatio-temporal dynamics of vegetation carbon use efficiency and its response to climate factors in Three-River Headwaters Region. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 401-413.
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