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Inner Mongolia Agricultural University (内蒙古农业大学 2021

Study on Wind Erosion Characteristics of Cultivated Land in Potato Sprinkler Irrigation Circle in Sandy Land

陈家欢

Titre : Study on Wind Erosion Characteristics of Cultivated Land in Potato Sprinkler Irrigation Circle in Sandy Land

Auteur : 陈家欢

Grade : Master 2021

Université : Inner Mongolia Agricultural University (内蒙古农业大学)

Résumé partiel
Potato sprinkler irrigation circle farmland lacks protective farming measures such as stubble and no-tillage,and becomes a source of wind and sand during the wind season.Wind erosion not only causes soil desertification and nutrient loss of farmland,but also wind-eroded sand substances will have a serious impact on the surrounding environment.Round-faced arable land and deep plowing harvesting are the basic characteristics of potato sprinkler irrigation circle arable land,which also causes the existence of certain peculiarities in the law of soil wind erosion.This thesis selects the potato sprinkler irrigation circle farmland in the sandy land of the northeastern edge of the Kubuqi Desert as the research object,and compares it with the uncultivated fixed sandy land around it.Observation of indicators such as diameter and other indicators in the field can reveal the characteristics of soil wind erosion in the potato sprinkler irrigation circle farmland in sandy areas,and provide a theoretical basis for the prevention and control of soil wind erosion in sandy areas.The main research conclusions are as follows :(1)There is serious wind erosion in the potato sprinkler irrigation circle,and the wind erosion amount is 504t·hm-2 in the wind season.Compared with the control,the amount of sediment transport increased by 103.35 times,and the content of clay and silt particles in the sand material output to the cultivated land increased by 3.52 and 4.97times,respectively.(2)Different lengths of aeolian sand transport paths have a significant effect on sand material transport.When the surface creep and saltation sediment material moves along the path,its content shows a trend of first increasing,then decreasing and then increasing.Overall,the activity is stable in the upwind and downwind parts of the circular surface cultivated land,while the activity is intense in the middle-wind parts.When the aeolian sand flow moved from upwind to downwind along the path,the aeolian sand flow unde r each path was enhanced,and the sediment transport increased by 51.97 times compared with the upwind,and the content of clay particles and silts in the 100-200cm height increased by 81.73%on average.

Mots clés : Soil wind erosion ;Sand flow ;Cultivated field ;Kubuqi Desert ;

Présentation (CNKI)

Page publiée le 5 mars 2022