水土保持学报2025，Vol.39Issue(2)：144-154,11.DOI:10.13870/j.cnki.stbcxb.2025.02.011
喀斯特区出露基岩对土壤水分入渗过程的影响
Effect of Exposed Bedrock on Soil Water Infiltration in Karst Region
摘要
Abstract
[Objective]The strong dissolvability of carbonate rock leads to the spatial distribution of karst soil and bedrock,and the outcroppings of bedrock are common,but the mechanism of their influence on hydrological processes is still unclear.In order to investigate the influence of outcropped bedrock on soil water infiltration,the soil infiltration rate at different distances of outcropped bedrock was measured by single-loop infiltration method.[Methods]Taking the soil 20 and 100 cm away from the bedrock as the research objects,the characteristics of preferential flow were studied by the bright blue staining and tracing method.[Results]The capillary porosity and organic matter content of non-bedrock soil were significantly higher than those of bedrock soil(p<0.05),but the soil bulk density was significantly lower(p<0.05).The infiltration parameters(initial,stable and average infiltration rate)of non-bedrock soil were higher than that of bedrock soil.The area of staining area and preferential flow path increased with the distance from the exposed bedrock.These results indicate that the infiltration capacity and preferential flow frequency of non-bedrock soils are stronger than those of bedrock soils.Rock surface roughness was an important factor affecting soil water infiltration process,and soil infiltration rate increased with the increase of rock surface roughness,and there was a very significant positive correlation between soil roughness and soil infiltration characteristics(p<0.01).Kostiakov Model(R2=0.89),Horton Model(R2=0.80)and Philip Model(R2=0.72)are the best fitting models for soil water infiltration process considering the influence of bedrock outcrop.[Conclusion]This study identifies the influence of exposed bedrock on soil infiltration characteristics and emphasizes the controlling role of rock surface roughness.关键词
喀斯特/出露基岩/入渗特征/入渗模型Key words
karst/exposed bedrock/infiltration characteristics/infiltration model分类
农业科学引用本文复制引用
曾红,董天富,杨静,张君,聂云鹏,陈洪松..喀斯特区出露基岩对土壤水分入渗过程的影响[J].水土保持学报,2025,39(2):144-154,11.基金项目
国家自然科学基金项目(42161009,31971438,42407485) （42161009,31971438,42407485）
