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Huazhong Agricultural University (2021)

Effects of Groundwater Depth on Physiological Indexes of Populus Euphratica and Its Response of Spectral Characteristic

王家强

Titre : Effects of Groundwater Depth on Physiological Indexes of Populus Euphratica and Its Response of Spectral Characteristic

Auteur : 王家强

Grade : Doctoral Dissertation 2021

Université : Huazhong Agricultural University

Résumé partiel
Populus euphratica forms a natural green corridor along the rivers of the Tarim Basin in Xinjiang,maintaining the stability of the desert riparian ecosystem in the desert-oasis transition zone.In this study,a monitoring research plot was set up in the National Public Welfare Forest Reserve in the lower reaches of the Yarkand River.The spectral reflectance and physiological index density of Populus euphratica leaves under different groundwater depths were obtained,and the spectral characteristics and physiological index density of Populus euphratica leaves under different groundwater depths were analyzed.At the same time,used the PROSPECT-SAIL model to simulate the Populus euphratica canopy spectrum and screen the sensitive spectral indices.Three machine learning algorithms were used to establish the Populus euphratica canopy physiological index estimation model,and completed the mapping of Populus euphratica physiological index density based on hyperspectral remote sensing.The spatial change characteristics of physiological indicators of the Populus euphratica were clarified in the Tarim River,and carried out the health evaluation analysis of the Populus euphratica to provide scientific basis for the precise management of the natural Populus euphratica forest and the conservation of the desert riparian ecosystem.The setting of groundwater depth range in this study corresponds to drought stress.The deeper the groundwater level,the more severe the drought stress

Mots clés : Populus euphratica ;Physiological indicators ;hyperspectral data ;Inversion of plant physiological and biochemical indexes ;Forest health evaluation ;Groundwater depth ;

Présentation (CNKI)

Page publiée le 18 février 2022