| Land use/land cover change(LUCC)is regarded as the most typical process that can directly represent human activities on the landscape scale.The soil ecological environment in arid areas is relatively fragile,and human activities interfere with the ecological environment problems such as soil desertification,soil salinization,desertification,grassland degradation,and reduction of biodiversity in the study area,resulting in the development of local resources and land use.With severe constraints,even the economic development pattern in western China has been affected to some extent.The Study area of this paper is the delta oasis of the Weigan and Kuqa Rivers has been accompanied by rapid urbanization,rapid population growth,and large-scale human activities such as reclaiming farmland,leading to the study area's regional land.The way of utilization has undergone a certain degree of change,and the resulting changes in the physical and chemical properties of the soil have also undergone corresponding changes,which have had a serious impact on the evolution of the soil ecological environment and the sustainable development of the local and all-existing soil.Therefore,to explore the effects of soil physical and chemical properties under different land use patterns in arid regions,can provide reasonable suggestions for the soil quality and sustainable development of land resources in the area.This study used the decision tree classification method in ENVI to classify the remote sensing images of the study area in 2017 for land use classification(agricultural-Land,forest-Land,grass-Land,salty-Land,water,and others),and selected four typical land use types of Oasis(agricultural-Land,forest-Land,grass-Land,salty-Land)as the research object,based on the existing land use data,the method of combining field survey river laboratory indoor analysis was used to explore the soil physical and chemical properties and soil physical and chemical properties under different land use patterns.The correlation between.Research indicates:(1)Through the study of soil physical properties of different land use patterns,each kinds of land use,the soil moisture content was increased with the increase ofdepth,and the trend is opposite with soil bulk density and gross capillary changing trend.In the forest-Land,the soil was relatively loose,and the bulk density was small,and the water content was large,which were due to its rich floor litter and bio-degradation,while the agricultural-Land was opposite.(2)In different kinds of land use soil chemical properties,in terms of vertical distribution,the pH value does not have obvious rules with the increase of soil depth.The average order of different pH value is: salty-Land>agricultural-Land>forest Land>grass-Land.At the same time,the soil salinity affects this local vegetation to this area salt the distribution to have certain influence.According to the distribution of halophytes in the study area is studied through field observations,show Tamarixram osissina,Halostachys caspica with phragm ites australis are distributed in most of the salt in the study area.These vegetation have wide and high ability fitting to salty soil.Soil organic matter content tends to decrease as soil depth increases.The average soil organic matter content of different land use patterns is ranked as: forest land>grass land>agricultural land>salty land.(3)In each of the indicators,there is a negative correlation relationship between moisture content and bulk density,porosity,pH and SOM.There is a negative correlation between soil pH and soil organic matter.The reason may be that with the increase of the soil pH value,the surface vegetation cannot grow properly due to pH in adaptability,resulting in a large number of surface vegetation death,thus destroying the ecological environment of soil animals,plant and microorganisms,so the decomposition rate of organic matter is reduced.Soil bulk density is basically positively correlated with other soil physical and chemical properties. |
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