Rock outcrops redistribute water to nearby soil patches in karst landscapes
Rock outcrops redistribute water to nearby soil patches in karst landscapes
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DOI：
10.1007/s11356-016-6091-9
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发表时间：
2016-05-01
影响因子：
5.8
通讯作者：
Li, Yu-hui
中科院分区：
文献类型：
--
作者：
Wang, Dian-jie;Shen, You-xin;Li, Yu-hui
岩石露头的出现在陆地生态系统中非常常见。然而，很少有人关注它们在降水再分配中的水文作用，特别是在地表很大一部分被碳酸盐露头占据的岩溶生态系统中。在中国石林的石漠化生态系统、人工林生态系统和次生林生态系统中，采集和测量了露头吸收的水分及其向土壤的输出。结果表明，露头获得了大量的水分，并通过径流将近一半的水分输送到附近的土壤斑块。3个生态系统间露头年吸水量与输水量的比值无显著差异。当露出地面的面积达到地面的70%时，土块从岩石径流中获得的水量将与降雨的水量相等，这意味着土壤面临的降雨量是地面的两倍。这种水量可以增加对附近土块的水分输入，并在不同岩石出露的地区之间造成水分不均匀。
The emergence of rock outcrops is very common in terrestrial ecosystems. However, few studies have paid attention to their hydrological role in the redistribution of precipitation, especially in karst ecosystems, in which a large proportion of the surface is occupied by carbonate outcrops. We collected and measured water received by outcrops and its subsequent export to the soil in a rock desertification ecosystem, an anthropogenic forest ecosystem, and a secondary forest ecosystem in Shilin, China. The results indicated that outcrops received a large amount of water and delivered nearly half of it to nearby soil patches by means of runoff. No significant difference was found in the ratio of water received to that exported to the soil by outcrops among the three ecosystems annually. When the outcrop area reaches 70 % of the ground surface, the amount of water received by soil patches from rock runoff will equal that received by precipitation, which means that the soil is exposed to twice as much precipitation. This quantity of water can increase water input to nearby soil patches and create water content heterogeneity among areas with differing rock emergence.