| 苔藓覆盖对喀斯特林地碳酸盐岩红土剥蚀过程的影响 |
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| 引用本文： | 蒋娟,曾昊,刘冬冬,车陆禄,张广映.苔藓覆盖对喀斯特林地碳酸盐岩红土剥蚀过程的影响[J].水土保持学报,2022,36(2):92-98,105. |
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| 作者姓名： | 蒋娟 曾昊 刘冬冬 车陆禄 张广映 |
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| 作者单位： | 1. 贵州大学资源与环境工程学院, 贵阳 550025;2. 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025;3. 湖州南太湖水利水电勘测设计院有限公司宁波分公司, 浙江 宁波 315300 |
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| 基金项目： | 国家自然科学基金项目（41807016）；黔科合支撑项目（[2020]4Y010）；贵州省水利科技经费项目（KT201803）；贵州省研究生基金立项课题项目（黔教合YJSCXJH[2020]094） |
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| 摘 要： | 为探究苔藓覆盖对喀斯特山地土壤剥蚀过程影响的机理,通过野外采集原状土样,结合上方来水冲刷剥蚀试验,分析了不同坡度(5°,20°)与不同土壤含水率(饱和含水率、田间含水率)条件下苔藓盖度与土壤分离能力间的定量关系,解析了坡面流水力特征参数对苔藓覆盖的响应规律.结果表明:在5°和20°坡度下,苔藓覆盖下饱和土壤的土壤剥蚀率...
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| 关 键 词： | 苔藓覆盖 喀斯特林地 碳酸盐岩红土 剥蚀过程 |
| 收稿时间： | 2021/9/11 0:00:00 |
Effects of Moss Cover on Detachment Process of Carbonate Derived Laterite from Karst Forest Land |
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| JIANG Juan,ZENG Hao,LIU Dongdong,CHE Lulu,ZHANG Guangying.Effects of Moss Cover on Detachment Process of Carbonate Derived Laterite from Karst Forest Land[J].Journal of Soil and Water Conservation,2022,36(2):92-98,105. |
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| Authors: | JIANG Juan ZENG Hao LIU Dongdong CHE Lulu ZHANG Guangying |
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| Institution: | 1. College of Resource and Environment Engineering, Guizhou University, Guiyang 550025;2. Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guiyang 550025;3. Huzhou Nantai Lake Water Conservancy and Hydropower Survey and Design Institute Co. Ltd., Ningbo Branch, Ningbo, Zhejiang 315300 |
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| Abstract: | The influences of moss cover on detachment process of carbonate derived laterite in karst mountainous lands were explored and analysed. Undisturbed soil samples were collected and subjected to flow scouring in a 3.5 m long hydraulic flume. Two degrees of slope (5°, 20°) and two soil water contents (saturated soil water content, field capacity) were selected to quantify the relationship between moss coverage and soil detachment rate. The responses of hydraulic characteristics of slope runoff to moss cover were also analyzed. Compared to the field capacity, the results indicated that the detachment rate of saturated soil under moss cover increased by 33.9% and 10.8% at slopes of 5 and 20 degrees, respectively. The effects of moss cover on reducing soil detachment rate were more effective than that of bare soil without moss cover, and its effects were more obvious at lower slopes. The detachment rate under field capacity soil condition decreased in a linear trend with increasing moss coverage (R2>0.995). The moss cover had significant effects on the hydraulic characteristics of runoff flow at the slope of 5 degrees. The moss cover under saturated soil condition significantly changed the flow regime of surface runoff (P<0.05). Compared to bare soil without moss cover, the moss cover significantly reduced the runoff velocity (-20.6%), Reynolds number (-0.6%), Froude number (-28.6%) and runoff power (-0.8%), increased the runoff depth (+27.8%), flow shear stress (+26.9%) and Darcy-Weisbach resistance coefficient (+117.0%). Besides, the moss cover had no significant effects on the hydraulic characteristics of slope runoff at the slope of 20 degrees. Overall, no significant correlation exhibited between the hydraulic characteristics of runoff flow and the soil detachment rate of carbonate derived laterite covered with moss. These results can provide the experimental data for the study of applying moss cover to soil and water conservation in karst mountainous lands. |
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| Keywords: | moss cover karst forest land carbonate derived laterite detachment process |
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