【作者】 王燕；

【导师】 蒙仲举；

【作者基本信息】 内蒙古农业大学 ， 水土保持与荒漠化防治， 2019， 硕士

【摘要】 为了探明干旱半干旱地区典型土地类型土壤颗粒风蚀特征,定量确定其年内风蚀损失量,以武川县旱作农区常见土地类型草地、林地、农田、裸地为研究对象,运用多重分形方法定量分析土壤颗粒风蚀后在空间分布上的差异,并分析其产生的原因;采用修正后的大田推广模型进行风蚀量估算,并与粒度对比法估算的土壤风蚀量进行对比,确定模型的精度,推导出适用于当地的土壤风蚀预测模型,试验结论如下:(1)研究区内各土地类型中土壤粒度组成以粉粒和砂粒为主,平均粒径值在0.16～0.59mm之间;易蚀颗粒的粒径范围为110～270μm;土壤颗粒在粒径500～600μm围内发生累积。(2)4种土地类型的土壤分形维数从大到小为:草地>农田>林地>裸地;土壤粒径广义维数谱为“S”型且具有一定宽度;多重分形谱函数为单峰凸曲线,左右不对称,土壤粒径非均匀现象明显。(3)该区域不可蚀颗粒粒径大于0.8mm,通过修正建立的土壤风蚀模型可较好的估算研究区年内土壤风蚀量,模型精度达86.37%。研究区土壤风蚀量表现为农田>裸地>林地>草地。更多还原

【Abstract】 In order to find out the characteristics of soil particle wind erosion in typical land types in arid and semi-arid areas,quantitatively determine the amount of wind erosion loss during the year.The grassland,woodland,farmland and bare land of common land types in dry farming areas of Wuchuan County were used as research objects,and multi-fractal method was used to quantify.The differences in spatial distribution of soil particle wind erosion were analyzed,and the causes were analyzed.The modified field promotion model was used to estimate the wind erosion amount,and the soil wind erosion amount estimated by the particle size comparison method was compared to determine the accuracy of the model.The local wind erosion prediction model is applied to the local area.The test results are as follows::(1)The soil particle size composition of each land type in the study area is mainly composed of silt and sand,the average particle size is between 0.16～0.59mm;the particle size range of erodible particles is 110～270μm;the particle size of soil particles is Accumulation occurred within the range of 500～600μm.(2)The soil fractal dimension of the four land types is from large to small:grassland>farmland>woodland>bare land;the general dimension spectrum of soil particle size is "S" type and has a certain width;the multifractal spectrum function is single The peak-convex curve is asymmetrical,and the soil particle size is not uniform.(3)The particle size of the non-corrodible particles in this area is larger than 0.8mm.The soil wind erosion model established by the correction can better estimate the soil wind erosion in the study area,and the model accuracy is 86.37%.The amount of soil wind erosion in the study area is farmland>bare land>forest land>grassland.更多还原