Study On Degradation Characteristics And Restoration Measures Of Meadow Soil In Horqin Sandy Land

The degradation of meadow soil in Horqin Sandy Land is becoming more and more serious.The main types of soil degradation are soil desertification and salinization.In this paper,the meadow soil of Horqin Sandy Land was used as the research object,and the buried ancient soil residue with original physicochemical properties was selected as the original control(CK),and the enclosed plot(N)and alfalfa planting plots were set up without forage planting.M),oat planting plot(Y),mild salinization plot(LG),moderate salinization plot(MG),severe salinization plot(HG).Through field investigation sampling and laboratory analysis,the soil particle size,soil nutrient and soil salinity were studied.The relationship between soil degradation and soil organic carbon,salt and soil particlesize in Horqin Sandy Land was explored.The main findings of this paper are as follows:(1)The meadow soil of Horqin Sandy Land belongs to sandy soil texture,and the grain size composition is mainly composed of sand grains and powder particles.The sand content is high,and the overall variation is between 49.84%and 88.72%.The content of the granules is relatively low,ranging from 11.28%to 62.07%.The cosmids generally fluctuate between 0 and 2.15%.The overall soil sorting of the study area is poor.The fine sand components in the soil are mostly,the coarse sand components are less,and the whole tends to be negatively skewed.(2)Changes in the natural environment have led to a decrease in the nutrient content of the meadow soil in Horqin Sandy Land.The contents of soil organic matter,total nitrogen,total phosphorus,alkali nitrogen,available phosphorus and available potassium showed a decreasing trend,and the surface layer decreased significantly(P<0.05).Soil nutrient traits were effectively improved by enclosure measures and rational planting of pasture.(3)Under the joint influence of human factors and natural factors,the soil value of the meadow soil in Horqin sandy land showed an increase in pH value,total salt content,and eight major ion contents,and the surface soil increased significantly(P<0.05).Soil salinization in the study area is increasing.Reasonable enclosure and forage planting have played a role in preventing sand and sand fixation and improving soil salinity characteristics in desertification and salinization environments.(4)The soil organic carbon in the meadows of Horqin sandy land was significantly correlated with the particle size of all levels.The soil organic carbon content was significantly positively correlated with the clay(P<0.01),and the organic carbon content increased by 1%.The content increased by 9.214 g/kg;the soil organic carbon content showed a very significant linear positive correlation with the powder(P<0.01),the organic content increased by 0.39%,the organic carbon content increased by 0.379 g/kg,and the soil organic carbon content and sand There was a significant linear negative correlation(P<0.05),and the organic carbon content decreased by 0.370 g/kg for every 1%increase in sand content.(5)LG,MG,HG are mainly sulfate and soda salt,while M and Y are mainly sulfate.By planting vegetation,the total soil salt content is reduced,which changes the soil salinity composition and the original soil environment,which is beneficial to the accumulation of soil nutrients.There is a close correlation between soil salinity and mechanical composition.In the same way,the total salt content showed a significant negative correlation with the sand(P<0.01),and it was significantly positively correlated with the powder(P<0.01).