中國北方草地植被生產(chǎn)力空間分異特征及驅(qū)動機制

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中圖分類號：S812 文獻(xiàn)標(biāo)識碼：A 文章編號：1007-0435（2025）08-2677-08

doi：10.11733/j.issn.1007-0435.2025.08.027

Abstract：Based on multi-source remote sensing data，through the calculation of various parameters during the rapid growth period，combined with methods such as analysis of variance，corelation analysis and structural equation model，in this studywe analyzed the distributioncharacteristics and driving mechanisms of the total primary productivity of vegetation in meadow steppe，typical steppe and desert steppe in Inner Mongolia region of northern China from 2OOO to 2O18.The results showed that the total primary productivity of meadow steppe is the highest （767.5g?m-2） ，significantly higher than that of typical steppe （429.1g?m-2） ） and desert steppe （112.7g?m-2） . Crucially， productivity regulation was principally mediated through growth rate modulation during the rapid growth phase （ R2=0.90 ，rather than the length of the rapid growth period. Soil moisture emerged as the paramount environmental controlerofrapid growth phase dynamics，exhibiting differential influence along the aridity gradient-strongest in moisture-abundant meadow steppe （path coefficient =0.81 ）and pro gressively attenuated in typical steppe（O.73）and desert steppe（O.64）．These findings establish a hierarchical environmental control pathway：soil moisture $$ rapid growth rate $$ productivity，while demonstrating an inverse relationship between regulatory intensity of growth rate on productivityand ecosystem aridity（desert> typical>meadow）.The study further identifies diminishing moisture limitation on growth rates with increasing environmental aridity，providing critical insights for developing spatially diffrentiated grassand management strategies in water-limited ecosystems.

Key words：Steppe types;Fast growth phase;Growth rate;Spatial variability

草地作為重要的陸地生態(tài)系統(tǒng)類型之一[1]，其植被生產(chǎn)力動態(tài)不僅是衡量生態(tài)系統(tǒng)服務(wù)功能的核心指標(biāo)，更是調(diào)控全球碳循環(huán)過程的關(guān)鍵環(huán)節(jié)。（剩余12958字）