Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Chine → 2021 → Dynamics of NDVI and Soil Moisture Distribution Pattern over Qinghai-Tibet Plateau in Recent 20 Years

Gansu Agricultural University (2021)

Dynamics of NDVI and Soil Moisture Distribution Pattern over Qinghai-Tibet Plateau in Recent 20 Years

陈宝林

Titre : Dynamics of NDVI and Soil Moisture Distribution Pattern over Qinghai-Tibet Plateau in Recent 20 Years

Auteur : 陈宝林

Grade : Master These 2021

Université : Gansu Agricultural University

Résumé partiel
Soil moisture is an important factor of material and energy flow and interconnection in a certain range formed by soil,vegetation and atmosphere.It has a strong influence on the evapotranspiration and transport of surface soil water and the cycling of carbon and nitrogen elements.Soil moisture can determine the growth state and distribution pattern of vegetation in an ecosystem in a region.Soil moisture is one of the indispensable indexes and parameters in many fields such as hydrology,ecology and agriculture.The distribution of soil moisture in the topsoil is affected by many factors such as precipitation and topography,so it shows the characteristics of uneven spatial distribution.With the help of remote sensing,it becomes a new breakthrough point to acquire regional soil moisture distribution characteristics in a large range and rapidly.This paper takes the Qinghai-Tibet Plateau as the study area and uses the arid vegetation index method to retrieve soil moisture.Firstly,the MOD11A1 data from March 2000 to February 2020 were compensated by the historical mean method and the spatial distribution pattern of LST over the Qinghai-Tibet Plateau was analyzed.After that,Normalized Difference Vegetation Index(NDVI)of the Qinghai-Tibet Plateau from 2000 to 2019 was analyzed by means of spatial trend analysis based on MOD09 GA data of the same period.Spatial distribution of normalized vegetation index(NDVI).Then,NDVI and LST were combined to obtain the monthly dry and wet edge fitting equations and fitting coefficients of the Qinghai-Tibet Plateau from March 2000 to February 2020.Then,spatial trend analysis and future trend analysis were used to analyze the TVDI(Temperature Vegetation)of the whole Qinghai-Tibet Plateau from 2000 to 2019 Spatial distribution characteristics of temperature and vegetation Dryness Index.Finally,soil moisture of the Qinghai-Tibet Plateau was retrieved based on the measured soil moisture data and TVDI distribution results,and the inversion results were verified by combining the mean relative error and root mean square error of evaluation parameters

Mots clés : Remote sensing ;Qinghai-Tibet Plateau vegetation ;NDVI;TVDI ;soil moisture ;

Présentation (CNKI)

Page publiée le 31 octobre 2021