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Northwest A&F University (2022)

Soil Water Deficit and Replenishment Potential of Different Land Use Types on the Loess Plateau

黄泽

Titre : Soil Water Deficit and Replenishment Potential of Different Land Use Types on the Loess Plateau

Auteur : 黄泽

Grade : Doctoral Dissertation 2022

Université : Northwest A&F University

Résumé partiel
As a key variable in the soil-plant-atmosphere continuum,soil moisture plays a decisive role in the ecological effects of vegetation construction.At present,water shortage has become serious with climate warming and the increasing of vegetation cover.Water stress is one of the most important factors causing vegetation degradation and even death.The degradation of vegetation will inevitably lead to soil degradation.How to maintain the sustainability of soil water is the key of ecological environment sustainable development.Therefore,to clarify the interaction between land use types and soil,explore the consumption and replenishment process of soil water,which is of great significance in rational utilizing limited water resources and improving soil water environment.In this study,a large-scale land use survey,soil sample collection and soil moisture measurement were carried out on 180 sample sites in the Loess Plateau,with forestland,shrub and grassland as the research objects and cultivated land as the control.According to the zonal distribution of precipitation and soil types in the study area,it can be divided into three precipitation zones : 300-400 mm,400-550 mm and 550-700 mm,and three soil types : aeolian soil,loess soil and dark loessial soil.This study based on different precipitation zones and soil types,quantitatively analyzed the effects of land use types on soil structure and soil organic matters.Exploring the changing and relative deficit of soil water under different land use types.Revealing the potential of soil water compensation by quantifying the water recharge during infiltration process.Moreover,combined with the soil properties,to explore the main factors affecting soil water and infiltration process.

Mots clés : Soil structure ;Soil infiltrability ;Soil moisture content ;Soil water replenishment ;Vegetation density ;

Présentation (CNKI)

Page publiée le 18 octobre 2022