title: Rock outcrops redistribute water to nearby soil patches in karst landscapes.
abstract: 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.
authors.affiliation: Key Laboratory of Tropical Forest Ecology; Restoration Ecology Research Group, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, 650223, People's Republic of China.
authors.forename: Dian-Jie
authors.initials: DJ
authors.lastname: Wang
authors.affiliation: Key Laboratory of Tropical Forest Ecology; Restoration Ecology Research Group, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, 650223, People's Republic of China. yxshen@xtbg.ac.cn.
authors.forename: You-Xin
authors.initials: YX
authors.lastname: Shen
authors.affiliation: Stone Forest Scenic Area Administration, Shilin, 652211, People's Republic of China.
authors.forename: Jin
authors.initials: J
authors.lastname: Huang
authors.affiliation: Yunnan Normal University, Kunming, 650092, People's Republic of China.
authors.forename: Yu-Hui
authors.initials: YH
authors.lastname: Li
mesh_terms: D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D065928:Forests; D062070:Hydrology; D012987:Soil / Q000737:chemistry*; D014197:Trees; D014867:Water / Q000032:analysis; D014872:Water Movements
chemical_list: D012987:Soil; D014867:Water
keywords: Biodiversity nutrients; Karst; Outcrops; Precipitation; Runoff soil water