干旱区研究2024，Vol.41Issue(6)：964-973,10.DOI:10.13866/j.azr.2024.06.06
中国旱区GPP时空演变特征及影响因素研究
Characteristics of the spatial and temporal evolution of Gross Primary Productivity and its influencing factors in China's drylands
摘要
Abstract
This study aimed to clarify the carbon sequestration capacity and its change mechanisms in the dry-lands of China.The study used the AI index to delineate the extent of drylands.Based on the MODIS Vegetation Gross Primary Productivity(GPP)dataset,the temporal and spatial characteristics of vegetation carbon sequestra-tion capacity in China's drylands from 2001 to 2020 were investigated.This investigation considered meteorolog-ical data,including temperature,precipitation,Vapor Pressure Deficit(VPD),soil water content,and human activ-ities such as land use.The results reveal the following:(1)Over the 20 year period,GPP in China's drylands ele-vated significantly in 64.72%of the regions.(2)Temperature had the lowest impact on GPP,with a relative contri-bution rate of 21.70%.Precipitation and soil water content emerged as the dominant factors driving GPP growth,with their combined contribution rate exceeding 55%.As drought intensified,the effect of water stress gradually strengthened.In different vegetation types,except for mixed forests and alpine vegetation,precipitation was the most critical climate factor influencing GPP changes.(3)Differences in soil and landform types were the domi-nant factors influencing the spatial variation of GPP.Moisture and land use type factors also played important roles,with the explanatory power of the interaction between any two factors exceeding that of a single factor.The interaction between soil type and the other factors was particularly remarkable.The study's findings hold essen-tial theoretical implications for a deeper understanding of the evolution characteristics of carbon sinks in arid eco-systems in China and their response mechanisms to external environmental factors.关键词
植被总初级生产力/气候变化/响应机制/地理探测器/中国旱区Key words
gross primary productivity/climate change/response mechanism/geographic detector/China's drylands引用本文复制引用
唐可欣,郭建斌,何亮,陈林,万龙..中国旱区GPP时空演变特征及影响因素研究[J].干旱区研究,2024,41(6):964-973,10.基金项目
国家自然科学基金项目(32271959) （32271959）
交通运输部公路科学研究所"公路交通环境保护技术交通运输行业重点实验室开放课题"(2020HXFWSBXY027) （2020HXFWSBXY027）
宁夏回族自治区重点研发计划(2023BEG02049) （2023BEG02049）
国家重点研发课题(2022YFF1300404) （2022YFF1300404）
