三江源植被碳利用率动态变化及其对气候响应

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Abstract

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.

Key words： MODIS carbon use efficiency climate response Three-River Headwaters region

Received: 30 May 2019

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X171

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	ZHENG Fei-ge
	YI Gui-hua
	ZHANG Ting-bin
	LI Jing-ji
	BIE Xiao-juan
	LIU Dong
	QIN Yi
	ZHANG Tian-tian

Cite this article:

ZHENG Fei-ge,YI Gui-hua,ZHANG Ting-bin等. Study on spatio-temporal dynamics of vegetation carbon use efficiency and its response to climate factors in Three-River Headwaters Region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 401-413.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I1/401

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