Effects Of Adding Corn Straw To Soil Physical Properties And Soil Wind Erosion In Sand Area

Corn stalks are the main resource for returning straw to the field,which can improve the fertility of cultivated land and improve soil structure.After returning to the field,crushed corn stalks are easier to decompose and transform.However,the impact of crushed corn stalks on wind erosion and soil physical properties of windy sandy cultivated land The effect is not yet clear.Aiming at the serious practical problem of wind erosion of wind-sandy farmland,we make full use of the large amount of redundant corn stalk resources in sandy areas,and it is urgent to tap the potential of crushed corn stalks to inhibit wind erosion of arable land.This thesis takes the aeolian sandy cultivated land where potatoes are grown on the northern edge of the Kubuqi Desert as the research object,applies crushed corn stalks to its surface soil,and explores the impact of crushing corn stalks into the field on soil physical properties and soil wind erosion.Through a combination of indoor and field tests,4 particle sizes(0.5cm,2cm,4 cm,7cm)and 10dosages(10%,20%,30%,40%,50%,60%,70%,80%,90%,100%)of corn stalks on farmland soil wind erosion and changes in soil physical properties provide a scientific basis for the technology of returning straw to the field and corn stalks to prevent wind erosion of farmland.The main research conclusions are as follows:(1)The addition of crushed corn straw can improve the water holding capacity of soil.Tongduo compared the soil water absorption,evaporation,water content and other indicators under different amounts of crushed corn straw and different particle size types.The results showed that the amount of straw was the main factor affecting the soil water retention effect,and the type of straw particle size was not the main factor affecting the soil water content.The effect of reducing soil water absorption appeared when the straw particle size was 7 cm.After 30 days of evaporation,the water content of CK was 7.65%,and the water content of each treatment was 1.33-9.29 times of that of CK.(2)The addition of crushed corn straw can improve the wind erosion resistance of soil.The larger the grain size of straw and the more the amount of straw,the smaller the soil wind erosion rate and the weaker the sediment transport.The wind erosion depth can be reduced by 4.27%-130.49%.In short-term monitoring,the phenomenon of over accelerated wind erosion occurred in the process of 0.5cm,2cm,4cm particle size and 10%or 30% dosage treatment.The most serious problem was the proportion of 0.5cm straw particle size with 10% dosage,while the accumulation phenomenon would appear in the treatment of 50% dosage of 4cm,7cm particle size.However,in the long-term monitoring of wind erosion,adding crushed corn straw can inhibit soil wind erosion.The addition of crushed corn straw can reduce soil bulk density,increase soil porosity and maintain soil water content.(3)Under different laying methods,crushed corn straw has different inhibition effects on soil wind erosion.The order of wind erosion resistance was straw mulching >straw soil mixture > furrow Application > CK.Compared with CK,the surface sediment transport of cultivated land under the three settings decreased by 64.66%,37.23% and 20.32%,respectively.