伊犁地区气候、物候、地形及组合与草地净初级生产力间关系

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中图分类号：S812 文献标识码：A 文章编号：1007-0435（2025）08-2585-1

Abstract：This study investigated the regulatory mechanisms of carbon sequestration in Yili grassland ecosystems （2001-2O2O）by integrating vegetation Net Primary Productivity （NPP），phenological parameters， remote sensing，and meteorologicaldata through the Geodetector model. The results indicated that a non-significant declining trend in annual mean value of grassland NPP. Topography and phenology jointly dominated NPP spatial heterogeneity，with elevation，Length of Season （LOS），Start of Season （SOS）and End of Season （EOS） consistently identified as the strongest drivers （ .P<0.01 ）.Notably，the interaction explanatory power between elevation and phenological parameters exceeded O.6OO in allperiods，underscoring topography' s critical role in mediating phenological processes to regulate ecosystem productivity. The study quantitatively deciphered carbon cycle responses in arid mountain ecosystems under climate warming，demonstrated the decisive control of phenology-topography coupling effects on NPP spatial patterns.These findings provide theoretical foundations for precise carbon sink assessment in Northwest China's ecological barrier regions and ofer scientific insights for achieving carbon neutrality goals.

Key words：Net primary productivity;Phenology; The interaction effect;Geographic detector;Remote sensing

净初级生产力（Netprimaryproductivity，NPP）代表植物通过光合作用转化为有机物的总量[1-2]。（剩余17983字）