青海湖北部近30年不变草地与不变耕地土壤粒度差异及其指示意义

发布时间：2018-06-01 16:01

本文选题：青海湖北部 + 人为活动　；参考：《水土保持研究》2016年05期

【摘要】：在前期对青海湖流域1987年、1995年、2000年、2005年、2010年5期遥感图像解译基础上,对受人类活动影响严重和沙漠化趋势加剧的环青海湖北部区域近30年不变草地和不变耕地土壤粒度进行了分析。结果表明:研究区不变草地和不变耕地粒度组成上都属于砂黏壤级,但各组分之间存在明显差异,其中不变草地粉砂和黏粒大于不变耕地,而砂含量小于不变耕地;不变草地和不变耕地粒度参数特征表明不变草地平均粒径较小,分选更好,粒度曲线更为近对称分布,峰度中等,而不变耕地则平均粒径偏大,分选较差,粒度曲线偏正偏;不变草地和不变耕地剖面上表现为土壤粒度以地层深度30—35cm为界存在异同,其中不变草地和不变耕地在30cm以上地层范围内土壤粒度差异非常显著,30cm以下范围内土壤粒度差异很小。
[Abstract]:Based on the interpretation of five remote sensing images of Qinghai Lake Basin in 1987, 1995, 2000, 2005 and 2010, The granularity of grassland and cultivated land in the northern region of Qinghai Lake was analyzed in recent 30 years, which was influenced by human activities and intensified by desertification. The results showed that the granularity composition of the invariant grassland and the invariant cultivated land belonged to the grade of sandy clay soil, but there were obvious differences among the components, among which the silt and clay of the invariant grassland were larger than that of the invariant cultivated land, and the sand content was smaller than that of the invariant cultivated land. The grain size parameters of the invariant grassland and the invariant cultivated land showed that the average particle size of the invariant grassland was smaller, the sorting was better, the granularity curve was closer to symmetrical distribution, the kurtosis was medium, while the average particle size of the invariant cultivated land was larger, the sorting was poor, and the granularity curve was biased. In the profile of invariant grassland and invariant cultivated land, there are similarities and differences between soil granularity and stratigraphic depth (30-35cm). Among them, the difference of soil granularity between invariant grassland and invariant cultivated land is very significant in the range above 30cm, and the difference is very small in the range below 30cm.
【作者单位】：青海师范大学青海省自然地理与环境过程重点实验室;青海师范大学生命与地理科学学院;青海省环境地质勘查局;
【基金】：青海省重点实验室发展专项资金(2014-Z-Y24) 青海省自然科学基金资助项目(2013-Z-913)
【分类号】：S152.3

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