CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, 666301, Yunnan, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2019 Aug;26(24):24840-24849. doi: 10.1007/s11356-019-05658-1. Epub 2019 Jun 25.
In mountainous areas, rock fragments (RFs) are a common feature on the soil surface and in topsoil. Few studies, however, have investigated the spatial distribution of RFs and the relevant mechanisms underpinning their distribution on steep hillslopes, especially in karst regions. We have collected and measured the RF cover, size, and content at the soil surface and within the topsoil of secondary forest, man-made forest, and non-forest land hillslopes in a karst region in Yunnan Province, southwest China. The results revealed no significant relationships between slope position and mean total RF coverage, median diameter (D), and mean total volumetric RF in topsoil within the three karst hillslopes covered by different types of vegetation. A limited effect of vegetation on the spatial distribution of RFs on the hillslopes was identified. However, the variation in RFs in the topsoil between the top and bottom slopes was greater than that at the surface between the top and bottom slopes, implying that underground leakage was greater than surface runoff.
在山区，土壤表面和表土中常见的特征是岩屑（RFs）。然而，很少有研究调查 RFs 的空间分布及其在陡峭山坡上分布的相关机制，特别是在岩溶地区。我们收集并测量了云南省岩溶地区次生林、人工林和非林地山坡上土壤表面和表土中 RF 的覆盖、大小和含量。结果表明，在三种不同植被覆盖的岩溶山坡上，坡位与表土中平均总 RF 覆盖率、中值直径（D）和平均总 RF 体积之间没有显著关系。植被对 RFs 空间分布的影响有限。然而，在山顶和山脚之间的表土中 RFs 的变化大于山顶和山脚之间的表面，这意味着地下渗漏大于地表径流。
