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

Titre : Spatial Distribution Characteristics and Influencing Factors of Soil Physical and Chemical Properties in Temperate Desert of Xinjiang

Auteur : 杨亚澜

Grade : Master 2022

Université : Xinjiang Agricultural University

Résumé partiel
Soil physical and chemical properties are one of the main factors affecting vegetation growth and soil nutrient content.Desert is the most important ecosystem in arid areas,accounting for 1/4 of the global land area and 27.9% of China’s land area.Among them,the temperate desert is the most typical ecosystem in Xinjiang.The study on the spatial distribution characteristics and influencing factors of soil physical and chemical properties in the temperate desert of Xinjiang is of great significance to the development of animal husbandry and soil and water conservation.Based on the measured soil profile data from 121 temperate desert soils in Xinjiang,the spatial distribution characteristics of soil physical and chemical properties（organic carbon content,inorganic carbon content,p H,bulk density and soil-rock ratio）and their responses to climate,elevation,aboveground net primary productivity,root biomass and other soil physical and chemical properties were analyzed.The main results are as follows :（1）The change of bulk density with soil depth is not obvious.In 0-20 cm soil layer,bulk density was negatively correlated with mean annual temperature and elevation.Soil organic carbon was negatively correlated with soil organic carbon at 0-5 cm and 10-20 cm.There was a negative correlation with inorganic carbon content in 0-30 cm soil layer.At 20-30 cm,it is positively correlated with the ratio of soil to rock.However,the mean annual temperature and p H had no effect on bulk density in the seven soil layers.（2）In 0-30 cm soil layer,the ratio of soil to rock increases with the increase of soil depth,but in30-100 cm soil layer,the ratio of soil to rock decreases with the increase of soil depth.The mean annual precipitation has no effect on the soil-rock ratio.At 0-5 cm,5-10 cm and 70-100 cm,there was a positive correlation with the mean annual temperature.In seven soil layers,it is positively correlated with elevation.Soil organic carbon content,p H and bulk density had no effect on the soil-rock ratio,but the soil-rock ratio increased with the increase of soil inorganic carbon content in 0-50 cm soil layer.

Mots clés : Temperate desert ;soil physical and chemical properties ;climate;elevation ;aboveground net primary productivity ;root biomass ;

Présentation (CNKI)