YUAN Jie,CAO Guangchao,YU Min,et al.Difference of Soil Particle Size Between Unchanged Perennial Farmland and Permanent Grassland and Its Implications During Nearly 30 Years on the North of Qinghai Lake[J].Research of Soil and Water Conservation,2016,23(05):199-204.
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
- Title:
- Difference of Soil Particle Size Between Unchanged Perennial Farmland and Permanent Grassland and Its Implications During Nearly 30 Years on the North of Qinghai Lake
- Keywords:
- north of Qinghai Lake; human activities; soil particle size
- 分类号:
- S152.3
- 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—35 cm为界存在异同，其中不变草地和不变耕地在30 cm以上地层范围内土壤粒度差异非常显著，30 cm以下范围内土壤粒度差异很小。
- Abstract:
- Based on the interpretation of the remote sensing images of 1987, 1995, 2000, 2005 and 2010 years in Qinghai Lake basin, we investigated the difference of soil particle size between unchanged perennial farmland and permanent grassland during nearly 30 years on the north of Qinghai Lake, which has been severely affected by human activities and the desertification has been intensified. The results showed that composition of soil particle size in the unchanged grassland and farmland belonged was dominated by sand clay, but the compositions of soil sand, silt and clay sizes were significantly different, the contents of soil silt and clay on the grassland were greater than those in the farmland; the content of soil sand on the grassland was less than that in the farmland, indicating that the soil average particle size on the grassland was smaller; degree of sorting was better; soil particle size followed the normal distribution as well as peak value was moderate. For the farmland, soil average particle size and degree of sorting were converse, soil particle size more deviated positive values. In the soil profile, the difference of soil particle size between the unchanged grassland and farmland existed in the 30—35 cm depth, the difference was significant above 30 cm depth, but it was weak below 30 cm depth.
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备注/Memo
收稿日期:2015-10-22;改回日期:2015-11-19。
基金项目: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）
作者简介:袁杰(1989-),男,青海西宁人,博士研究生,研究方向为地表环境过程。E-mail:yuanjie8903@126.com
通讯作者:曹广超(1971-),男,山东苍山人,教授,博士生导师,主要从事GIS应用、地表环境过程研究。E-mail:caoguangchao@qhnu.edu.cn