Aridity thresholds Reveal transitions in dominant drivers of partitioned Water–Carbon coupling across Central Asian drylands
Shiran SongZhejiang-Kazakhstan Joint Laboratory on Spatio-Temporal Intelligence and Sustainable Development, Hangzhou 310014, ChinaXi Xi ChenZhejiang-Kazakhstan Joint Laboratory on Spatio-Temporal Intelligence and Sustainable Development, Hangzhou 310014, ChinaAkylbek KurishbayevKazakh National Agrarian Research University, Abay Avenue 8, Almaty 050010, KazakhstanPhilippe De MaeyerChuan WangXinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, ChinaChanjuan ZanSchool of Geographical Sciences, China West Normal University, Nanchong, Sichuan 637009, ChinaShukhrat ShokirovDepartment of Geodesy and Geoinformatics, Tashkent Institute of Irrigation and Agricultural Mechanization Engineers - National Research University, Tashkent, UzbekistanTie LiuZhejiang-Kazakhstan Joint Laboratory on Spatio-Temporal Intelligence and Sustainable Development, Hangzhou 310014, China
ABI
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• Aridity thresholds mark nonlinear shifts in dryland carbon–water coupling. • WUE and WUEc rebound under high aridity, indicating stress-tightened coupling. • Dominant controls shift from vegetation traits to hydroclimatic stressors. • Post-threshold, temperature is positive but VPD negative for WUE and WUEc.
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