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通过对研究区域11个受不同侵蚀程度的采样点进行剖面采样,采样的深度根据土壤侵蚀程度而定,对土壤样本进行土壤基本理化性质与磁化率测量分析。结果表明:坡顶和坡中土壤基本理化性质随侵蚀强度演变特征存在一定差异,坡中土壤理化性质的变化要较坡顶更为复杂,相比坡顶,坡中受侵蚀程度较严重。不同侵蚀强度土壤与未侵蚀土壤相比较,随着土壤侵蚀强度的增加,只有坡顶土壤中SOM的含量和坡中土壤中TK的含量达到了统计意义上的显著性差异;而土壤中其他的养分含量均未达到显著性差异。另外,只有坡顶草丛植被土壤磁化率含量较高,侵蚀程度较小;坡中,不同植被土壤磁化率含量变化较复杂,因此本研究区不能借助MS来反演紫色土的植被分布与侵蚀强度关系。
By sampling 11 samples with different erosion levels in the study area, the depth of sampling is determined according to the degree of soil erosion. Soil physical and chemical properties and magnetic susceptibility are measured and analyzed. The results show that there are some differences in the basic physical and chemical properties between the top and the slope with the evolution of the erosion intensity. The changes of the soil physical and chemical properties in the slope are more complicated than the top. Compared with the top, the erosion is more serious in the slope. Compared with the non-erosive soils, soil erosion intensities increased with the increase of soil erosion, and only SOM contents in the top soil and TK content in the slope soil reached a statistically significant difference; while in the soil Nutrient content did not reach significant differences. In addition, the content of soil magnetic susceptibility was higher in the vegetation on the top of the slope, and the degree of erosion was smaller. In the slope, the changes of soil magnetic susceptibility in the different vegetation were more complicated. Therefore, the vegetation distribution and erosion intensity of the purple soil could not be retrieved by MS in the study area relationship.