Study on Spatio-Temporal Evolution Characteristics of Vegetation Carbon Sink in the Hexi Corridor, China

Qiang Yang (), Shaokun Jia, Chang Li, Wenkai Chen, Yutong Liang and Yuanyuan Chen
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Qiang Yang: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Shaokun Jia: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Chang Li: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Wenkai Chen: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Yutong Liang: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Yuanyuan Chen: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

Land, 2025, vol. 14, issue 11, 1-21

Abstract: As a critical ecological barrier in the arid and semi-arid regions of northwestern China, the spatio-temporal evolution of vegetation carbon sequestration in the Hexi Corridor is of great significance to the ecological security of this region. Based on multi-source remote sensing and meteorological data, this study integrated second-order partial correlation analysis, ridge regression, and other methods to reveal the spatio-temporal evolution patterns of Gross Primary Productivity (GPP) in the Hexi Corridor from 2003 to 2022, as well as the response characteristics of GPP to air temperature, precipitation, and Vapor Pressure Deficit (VPD). From 2003 to 2022, GPP in the Hexi Corridor showed an overall increasing trend, the spatial distribution of GPP showed a pattern of being higher in the east and lower in the west. In the central oasis region, intensive irrigation agriculture supported consistently high GPP values with sustained growth. Elevated air temperatures extended the growing season, further promoting GPP growth. Due to irrigation and sufficient soil moisture, the contributions of precipitation and VPD were relatively low. In contrast, desert and high-altitude permafrost areas, constrained by water and heat limitations, exhibited consistently low GPP values, which further declined due to climate fluctuations. In desert regions, high air temperatures intensified evaporation, suppressing GPP, while precipitation and VPD played more significant roles. This study provides a detailed analysis of the spatio-temporal change patterns of GPP in the Hexi Corridor and its response to climatic factors. In the future, the Hexi Corridor needs to adopt dual approaches of natural restoration and precise regulation, coordinate ecological security, food security, and economic development, and provide a scientific paradigm for carbon neutrality and ecological barrier construction in arid areas of Northwest China.

Keywords: climate change; partial correlation; ridge regression; gross primary production; hexi corridor; China (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2025
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