砒砂岩区植物拦沙作用导致泥沙筛分效应研究  

Sieving Effect of Plants on Sediment-fixation in Soft Rock Areas

作　　者：谢毅文[1] 李怀恩[2] 李越 张强 高卫平 陈焕节[1] 

机构地区：[1]东莞理工学院化学与环境工程学院,广东东莞523808 [2]西安理工大学西北水资源与环境生态教育部重点实验室,陕西西安710048 [3]珠江水利委员会珠江水利科学研究院,广东广州510611 [4]珠江水利委员会,广东广州510611 [5]珠江流域水资源保护局,广东广州510611

出　　处：《水土保持通报》2012年第6期22-25,共4页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"植被过滤带对非点源污染物净化效果的试验研究与模拟"(50979090);广东高校优秀青年创新人才培养项目(LYM10123);东莞市科技计划项目(2012108102047)

摘　　要：对黄河中上游砒砂岩区两个典型流域(东一支沟和对比沟)进行了实地调查,并对其监测资料进行了对比分析。结果发现,种植沙棘的东一支沟沟床表层泥沙颗粒级配累积曲线及整体粒径呈由上游至下游逐渐变细的分布特征,而没有种植水保植物的对比沟则呈不规则分布;同时发现,东一支沟沟床表层土中粒径大于1mm的粗沙含量比例平均仅为2.0%,而对比沟则达9.93%。研究表明沙棘植被的拦沙固沙作用导致沟床产生了泥沙筛分效应。Combined with field survey,comparative analysis was conducted on long-term monitoring data collected in the Dongyizhigou gully and the adjacent contrast gully,which is located in the soft rock area in the upper and middle Yellow River basin.A clear trend of sediment grain-size distribution that sediment grain-size cumulative curve and total grain diameter became finer from the upper to lower stream was found in the Dongyizhigou gully,where seabuckthorn vegetation was planted and almost covered the whole gully.In contrast,the sediment grain size distribution showed no regularity at all in the control gully where no vegetation was planted.Specifically,the content of sediment with diameter larger than 1 mm was 2.0% on the gully bed of the Dongyizhigou gully,whereas it was 9.93% on that of the control gully.The analysis results showed that sand-fixing capability of seabuckthorn vegetation imposed a sediment sieve effect on the sediment transportation in the gully bed.

关 键 词：植物拦沙 筛分效应 泥沙级配 

分 类 号：TV21[水利工程—水文学及水资源] S157.1[农业科学—土壤学]