LI Hualin,GAO Huaduan,HU Qin,et al.Influence of Runoff on Sediment Yield on Slope in Karst Area[J].Research of Soil and Water Conservation,2017,24(02):26-30.
喀斯特地区坡面径流对产沙的影响
- Title:
- Influence of Runoff on Sediment Yield on Slope in Karst Area
- Keywords:
- karst area; vegetation types; slope runoff; sediment yield
- 分类号:
- S157.1
- 摘要:
- 贵州省关岭县蚂蝗田小流域属典型喀斯特流域，根据小流域2009—2012年6个坡面径流小区的定位观测资料，研究了乔木林（黄花梨）、灌木林（女贞）、撂荒草地三种不同植被类型下坡面径流对产沙的影响。结果表明：三种植被类型的产流次数相同，但产沙次数存在较大差异，表现为荒草地 > 乔木林 > 灌木林；灌木林与乔木林的年均径流量相差不大，荒草地的年均径流量是它们总和的2倍；荒草地的年均产沙量最大，为55.17 t/km2，是灌木林的11倍，乔木林的6倍；乔木林的产流量与产沙量无明显相关关系；灌木林表现出线性关系，拟合方程为y=0.1707x+0.2526，R2值为0.48；荒草地表现为幂函数关系，拟合方程为y=0.3246x1.2965，R2值为0.64。
- Abstract:
- Mahuangtian watershed is a typical karst basin in Guanling County of Guizhou Province. According to the observation data of six slope runoff plots from 2009 to 2012 in the small watershed, we’ve studied the effect of runoff on sediment in three different vegetation types, which are arbor forest, shrub forest and abandoned grassland. The main results are as followings. Three vegetation types had the same effect in times of runoff, but sediment yield events were different, the yield of sediment decreased in the order:grassland > arbor land > shrub forest; annual runoff in shrub land and arbor forest land was similar but the annual runoff of grassland was double as the total of former two types. Annual sediment yield of grassland was 55.17 t/km2 which is 11 times of sediment yield in the shrub forest, and 6 times of sediment yield in arbor; the runoff and sediment yield showed no significant connection in arbor forest but the linear relationship between runoff and sediment yield was found in shrub forest, the fitting equation is y=0.1707x+0.2526, R2 values is 0.48, and power function relationship was found in grassland, the fitting equation is y=0.3246x1.2965, R2 values is 0.64.
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备注/Memo
收稿日期:2016-06-15;改回日期:2016-07-19。
基金项目:贵州省专业学位研究生工作站项目”贵州省喀斯特生态与环境研究”（黔教研合JYSZ字[2014]003）；贵州省水利厅水利科技专项经费项目”草海流域坡耕地综合治理技术与示范”（KT201311）
作者简介:李华林(1992-),男,贵州铜仁印江县人,在读硕士,从事区域水土保持研究。E-mail:664380773@qq.com
通讯作者:高华端(1965-),男,贵州贵阳人,教授,博士,硕士生导师、主要研究方向:区域水土保持与环境。E-mail:gdghd110@163.com