弥河下游地区植被变化特征及对地下水埋深的响应

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中图分类号：TV211.1+2 文献标志码：A

Characteristics of Vegetation Changes and Response to Groundwater Depth in the Lower Reach Region of Mihe River

LIU Jie 1，2 ， LI Qingguo 1 ， YANG Wentai 1 ， LIU Fengming 1 ， CHEN Yang 1 ， LIU Yuyu 1 （1.School of Water Conservancy and Environment，University of Jinan，Jinan 25o022，Shandong，China; 2.Key Laboratoryof Coastal Zone Geological Environment Protection，Shandong Geology and Mining Bureau， Weifang ，Shandong，China）

Abstract：To explore the response of surface ecology to changes of groundwater level，the normalized diffrence vegetation index （NDVI）of thelowerreachof MeheRiverfrom 2O08to 2022 was used，andthe spatialand temporal characteristics of vegetation in the studyarea were analyzed bythetrend calculations，Mann-Kendallsignificance test，and Hurst index.Theclimaticand groundwaterbathymetrydatasets were combined，and theresponserelationship between vegetationand groundwater burial depth changes inthe lower reach of MiheRiver was studiedthrough thecorrelation and relative contribution data.Theresultsshowthat the NDVIof vegetation inthe lower reach of MiheRiver generally shows a fluctuating growth trend from 2008 to 2022，with a growth rate of 0.82% ，and the proportion of improved area reaches （2 86.35% .The burial depth of groundwater significantly affects the growth of 9O%of the regional vegetation in the study area.Inthecentralandsouthernregions，theabilityof groundwater burial depthrestoration todrivevegetation improvement isrelatively weak，butinthenorthernregion，thisabilityisstronger，andtherelativecontributionrateis slightlyhigherthanthatofclimate.Groundwaterburial depth declinehasastrongerabilitytodrive vegetation degradation in thecentraland southernregions，resulting ina more fragileecosysteminthese areasandariskof vegetation degradation，which is the main cause of vegetation degradation.

Keywords：vegetation；normalized diference vegetation index；climate；groundwater burialdepth；correlationanalysis; relative contribution

植被作为地表生态系统最重要的组成部分之一，在维持生态系统碳平衡、调节气候和保护生物多样性等方面发挥着重要作用[1]。（剩余8616字）