摘要
在黄土高原 60m长 (6°)的黄土裸露直线坡面上每隔 1 0m分别横向布设混有稀土La、Se、Nd、Sm、Eu、Dy氧化物的土壤条带 ,在模拟典型侵蚀性降雨情况下 (雨强 1 0mm·min- 1 ,历时 4 0min) ,通过量测出口径流泥沙过程对各时段输出泥沙及坡面沿程不同位置 6处沉积物中 6种稀土元素进行测定分析 ,结果表明 ,该坡面主要产沙部位在距分水岭 3 0～ 5 0m之间 ;
Soil belts of the oxide with REE such as La、Se、Nd、Sm、Eu and Dy were disposed every other 10?m on the bare straightly sloping surface along sloping length (60?m) and sloping degree (6°) in loess plateau. Under the condition of simulating typically erosive rainfall with fainfall intensity (1.0?mm·min -1) and rainfall duration (40?min), the process of runoff-sediment, sediment discharge of different periods and six kinds of rare earth elements in different positions along the sloping surface were measured and analyzed in the outlet. The results showed that the main place of sediment was 30～50?m from dividing ridge, and the difference of source and distribution about sediment was not obvious along the sloping surface.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2003年第2期98-101,共4页
Scientia Silvae Sinicae
基金
国家重点基础研究规划项目资助 ( 2 0 0 2CB1115 0 2 )
