生态学报2017，Vol.37Issue(6)：2067-2079,13.DOI:10.5846/stxb201510282178
喀斯特裸坡产流产沙过程试验研究
Runoff and sediment production processes on a Karst bare slope
摘要
Abstract
Artificial rainfall experiments were carried out on a simulated Karst bare slope in a steel tank,where the slope and degree of underground holes (cracks) could be adjusted,to study the production processes of runoff and sediment in these environments.During experiments,the tank was filled with soils and rocks.Results indicated that rainfall intensity,slope and degree of underground holes (cracks) had obvious influences on runoff and sediment production processes.(1) Sediment was produced from the soil surface when the actual rainfall intensity was greater than the critical rainfall intensity of 50-80 mm/h.Runoff and sediment yield changed with varied rainfall intensities,and the order of the runoff yield for three rainfall intensities was 50＞30＞80 mrn/h,and the order of the sediment yield for three rainfall intensities was 50＞30＞ 80 mm/h,respectively.(2) The underground sediment transport modulus decreased with increased slope,and the order of the sediment transport modulus for four slopes was 10°＜ 15° ＜20°＜25°.In the same rainfall event,we noted that the smaller the slope,the greater the sediment transport modulus reduction per unit time,and the order of the sediment transport modulus for the four slopes was 10°＞ 15° ＞20° ＞25°.(3) The degree of underground holes (cracks) had a significant effect on underground runoff and sediment yields.An increase in the degree of underground holes (cracks) led to increased underground soil erosion.Underground runoff and sediment yields increased with an increase in the degree of underground holes (cracks),and the order of underground runoff and sediment yields for three underground hole degrees was 1％ ＜3％ ＜ 5％.This study provides a deeper understanding of the mechanisms of soil erosion in Karst slope habitats and provides a theoretical basis for the management of rocky desertification control and ecological restoration.关键词
喀斯特土壤侵蚀/二元结构/人工降雨/地下孔(裂)隙/产流产沙Key words
Karst soil erosion/dual structure/artificial rainfall/underground holes (cracks)/runoff and sediment yields引用本文复制引用
严友进,戴全厚,伏文兵,彭旭东,靳丽..喀斯特裸坡产流产沙过程试验研究[J].生态学报,2017,37(6):2067-2079,13.基金项目
国家自然科学基金项目(41461057,41061029) （41461057,41061029）
贵州省应用基础重大专项课题(黔科合JZ字[2014]200207) （黔科合JZ字[2014]200207）
贵州大学引进人才科研项目(贵大人基合字[2015]63号) （贵大人基合字[2015]63号）
