文献类型：期刊文献

英文题名：Rainwater transformation to runoff and soil loss at the surface and belowground on soil-mantled karst slopes under rainfall simulation experiments

作者：Fang, Qian[1] Zhao, Longshan[1,2,3,4] Hou, Rui[1,3] Fan, Chunhua[1] Zhang, Jinxin[2]

第一作者：Fang, Qian

通信作者：Zhao, LS[1]

机构：[1]Guizhou Univ, Coll Forestry, Guiyang 550025, Guizhou, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[3]Guizhou Univ, Res Ctr Soil Eros & Ecorestorat Sci, Guiyang 550025, Peoples R China;[4]Minist Educ, Guizhou Karst Environm Ecosyst Observat & Res Stn, Guiyang 550025, Peoples R China

年份：2022

卷号：215

外文期刊名：CATENA

收录：;Scopus(收录号：2-s2.0-85128467424);WOS:【SCI-EXPANDED(收录号:WOS:000798079700002)】；

基金：This work was supported by the National Natural Science Foundation of China (41867014) , the Science and Technology Project of Guizhou Province of China (QKHZC [2022] YB202) , the Excellent Young Science and Technology Talents Program of Guizhou Province of China (QJHKYZ [2021] 025) , the China Postdoctoral Science Foundation (2020 M670527) .

语种：英文

外文关键词：Rocky land desertification; Soil erosion; Subsurface flow; Surface runoff; Underground fissure flow

摘要：Karst slopes have thin soil layers covering bedrock and feature multiple near-surface soil-rock interfaces (SRIs), which can produce hydrological processes that differ from those of nonkarst slopes. This study investigated the differences in the proportions of rainwater transformed into surface and belowground runoff and measured soil loss on soil-mantled karst slopes with different hydrological situations: bedrock with fissures (HS-1) and without fissures (HS-2). The rainfall intensity was 50 mm/h. Three slope gradients (5 degrees, 15 degrees and 25 degrees) were applied, and surface runoff (SR), subsurface flow (SF), underground fissure flow (UFF) and soil-rock interface flow (SRIF) were collected during rainfall. No SR was produced on 5 degrees slopes in either treatment. The proportion of rainwater absorbed by soil (RH) was approximately 34%-46% of the rainwater, with no significant differences (p > 0.05) between HS-1 and HS-2. On the 5 degrees and 15 degrees slopes, 28%-61% of the rainwater was transformed into UFF under HS-1, and 29%-50% of the rainwater was transformed into SRIF under HS-2. On the 25 degrees slope, the SRIF and UFF proportions were<18%. Bedrock fissures greatly affected the type of runoff but had little effect on the nearsurface soil water. The SR and SF amounts were 29%-67% and 3%-38% higher in HS-2 than in HS-1, respectively. Due to bedrock fissures, on average, 6% of rainwater was lost as underground flow during rainfall, and the extra rainwater, 30% on average, flowed along the SRI underground, potentially forming UFF. This difference occurs because the infiltrating rainwater that reaches the SRI can freely drain through bedrock fissures in HS-1 but not in HS-2. The soil loss via SF, SRIF and UFF was very low (<0.05 g/L). Therefore, slope gradients and bedrock fissures both have major effects on rainwater transformation, and soil loss via rainfall impact is very slow on soil-mantled karst slopes.