黄河中游城市群水源涵养时空演变特征及影响机制分析

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关键词：水源涵养；InVEST 模型；地理探测器；分段线性回归；时空地理加权回归；城市群；黄河中游中图分类号：X7．； TV88． 文献标志码：A doi：0．3969 ／ j．issn．000－379．05．06．07引用格式：，等．黄河中游城市群水源涵养时空演变特征及影响机制分析［J］．人民黄河，05，47（6）：0－6．

Analysis of the Spatiotemporal Evolution Characteristics and Impact Mechanism of Water Conservation in the Urban Agglomeration of the Middle Reaches of the Yellow River

WANG Shiyuan1， XIANG Yang1， WEI Weiyi2， ZHAO Longfei1， GAO Fanfan1（1．College of Geomatics， Xian University of Science and Technology， Xian 710054， China；2．College of History and Culture， Xianyang Normal University， Xianyang ， China）

Abstract： The InVEST model was used to quantify the spatiotemporal distribution characteristics of water conservation in the urban agglomer⁃ ation of the middle reaches of the Yellow River from 2000 to 2020． Geographic Detectors and Segmented Linear Regression were used to ana⁃ lyze the influencing factors of water conservation． Geographically and Temporally Weighted Regression （ GTWR） model was used to explore the impact mechanism of natural environment and human activities on water conservation． The results show that： from 2000 to 2015， the spa⁃ tial distribution of water retention capacity in the Middle Yellow River urban agglomeration exhibits a decreasing pattern from south to north， which shifts to a decline from both northern and southern ends toward the central region by 2020； Precipitation demonstrates the strongest ex⁃ planatory power for water retention， and the explanatory power of dual⁃factor interactions is significantly higher than that of single factors； The mean threshold values for precipitation， temperature， and relative humidity are 628.26mm ， 14∘C ， and 59.82% ， respectively； Areas domi⁃ nated by precipitation account for the largest proportion of regions influencing water retention changes， and dominant factors in other regions are gradually replaced by precipitation； The influence of natural environment on water retention decreases from south to north， and before 2015， regions dominated by human activities show a contraction in the east and expansion in the south， while after 2015， nearly all areas are predominantly dominated by natural environmental factors．

Key words： water conservation； InVEST model； geodetector； piecewise linear regression； Geographically and Temporally Weighted Regres⁃sion； urban agglomeration； middle reaches of the Yellow River

水源涵养是生态系统水量调节的核心，在水循环、净化水质、调节径流和维持生物多样性等方面发挥着重要作用［1］，直接关系着人类生活、生态系统和社会经济的协同发展。（剩余11910字）