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Université du Xinjiang (2019)

Analysis of Soil Salinity in Arid Area Plain under Human Activity Stress

王宁;

Titre : Analysis of Soil Salinity in Arid Area Plain under Human Activity Stress

Auteur : 王宁;

Grade : Master’s Theses 2019

Université : Université du Xinjiang

Résumé partiel
Soil salinity and its ion and water content are important indicators to measure the degree of soil salinization.However,the degree of soil salinization in arid areas is increasing with the increase of human stress.In this paper,the soils under different stress levels of human activities in a region of Xinjiang Fukang were studied.The differences in salt content and ion content,spatial distribution differences,salt and water spatial and temporal distribution changes,and CR and FDCR.The soil salinity under different human stress was predicted by the depth,width and area characteristics of the soil,and the soil in the arid area was provided by the knowledge of salinization under different human stress and the improvement of salinized soil.The main conclusions are as follows :(1)The average pH value of the soil is 7.86,which belongs to alkaline soil ;and the soil salt is 17.7(g/kg),which is generally strong salinized soil.With the increase of human activity stress,the degree of soil salinization increased,and the salinization degree was the highest in severe stress areas.Salinization and saline soil accounted for73.3%of all soil samples.The content of CO32-in the eight major ions of human soil was lower,and the contents of Cl-,SO42-and Na+were higher.The Cl-content of soil in the A,B and C areas were 1.99,3.34 and 6.65(g/kg),respectively.There was a significant positive correlation between soil salinity and Na+and Cl-content,and the correlation coefficient increased with the increase of human stress.The correlation between salt and Cl-correlation coefficient was the most obvious,and the B and C areas increased by 51%and 77%,respectively,compared with the A area.The correlation coefficient between Na+and Cl-is larger between ions,and increases with the increase of human stress.The clustering results showed that the three main ions of the soil salinity were Cl-,Na+and SO42-under three stress levels,so these three ions were used as the main salt segregants in the study area.(2)The spatial autocorrelation of soil Cl-under three human activity stresses was higher than that of Na+,and SO42-did not have spatial autocorrelation.The comprehensive Moran’s I coefficient,Z value and p value out of the stress-free zone Cl-is the highest spatial autocorrelation factor.The Moran’s I,Z and p value are 0.27,2.63and 0.002,respectively,and the confidence can pass 99%significance test.The corresponding degree of soil salinity and ion content distribution under different human stress increased with the increase of stress degree.The correspondence between salt and Cl-,Na+and SO42-in severe interference zone was 89%,82%and 75%,respectively..

Mots clés : human activities; soil salinity; spatial autocorrelation; soil spectrum; salt inversion;

Présentation (CNKI)

Page publiée le 13 novembre 2019