Exploring the spatiotemporal heterogeneity of vegetation changes in subtropical humid karst region under CO_(2)fertilization  

作　　者：CHEN Meng ZHOU Qiuwen PENG Dawei YAN Weihong 

机构地区：[1]School of Geography and Environmental Science,Guizhou Normal University,Guiyang,550001,China [2]Huanjiang Observation and Research Station for Karst Ecosystem,Guangxi Key Laboratory of Karst Ecological Processes and Services,Institute of Subtropical Agriculture,CAS,Changsha,410125,China [3]University of Chinese Academy of Sciences,Beijing,100049,China [4]Faculty of Geographical Science,Beijing Normal University,Beijing,100875,China [5]Forestry Bureau of Shibing County,556000,Guizhou,Qiandongnan Prefecture,China

出　　处：《Journal of Geographical Sciences》2025年第1期65-87,共23页地理学报(英文版)

基　　金：National Natural Science Foundation of China,No.41761003;The Karst Science Research Center of Guizhou Province,No.U1812401。

摘　　要：Terrestrial ecosystems heavily depend on vegetation,which responds to carbon dioxide(CO_(2))fertilization in hot and humid regions.The subtropical humid karst region is a hot and humid region;whether and to what extent CO_(2)fertilization affects vegetation changes in such regions remains unclear.In this study,we investigated the degree to which CO_(2)fertilization influences vegetation changes,along with their spatial and temporal differences,in the subtropical humid karst region using time-lag effect analysis,a random forest model,and multiple regression analysis.Results showed that CO_(2)fertilization plays an important role in vegetation changes,exhibiting clear spatial variations across different geomorphological zones,with its degree of influence ranging mainly between 11%and 25%.The highest contribution of CO_(2)fertilization was observed in the karst basin and non-karstic region,whereas the lowest contribution was found in the karst plateau region.Previous studies have primarily attributed vegetation changes in subtropical humid karst region to ecological engineering,leading to an overestimation of its contribution to these changes.The findings of this study enhance the understanding of the mechanism of vegetation changes in humid karst region and provide theoretical and practical insights for ecological and environmental protection in these regions.

关 键 词：KARST vegetation changes NDVI driving factors carbon dioxide FERTILIZATION 

分 类 号：X171.1[环境科学与工程—环境科学] Q948[生物学—植物学]