黄土丘陵沟壑区不同植被坡面产流产沙效应研究

Runoff and Sediment Yields of Different Vegetation Slopes in the Gullied Rolling Loess Area

为了分析新栽种植被坡面的产流产沙特性,基于罗玉沟流域试验站的自然降雨数据及3种植被(新栽植杏树、小冠花、冬小麦)覆盖小区的产流产沙数据,分析了不同坡度(10°、15°、20°)和不同雨型条件下各小区的产流产沙规律。结果表明:①不同坡度下各小区的产流量、产沙量均为林地最小,牧草地次之,农地最大。②雨型Ⅰ、Ⅱ条件下,各小区平均产流量均为林地小区<牧草地小区<农地小区。雨型Ⅰ条件下各小区平均产沙量牧草地小区<林地小区<农地小区,雨型Ⅱ条件下平均产沙量林地小区<牧草地小区<农地小区。③牧草地产流量与降雨量之间呈极显著正相关关系,农地产流产沙量与降雨量之间,产流量与平均雨强之间存在显著正相关关系。

In order to analyze the characteristics of runoff and sediment yields of newly planted vegetation slopes and based on the natural rainfall data and the data of runoff and sediment yields of plots covered by three vegetations(newly planted apricot tree,Coronilla Linn.and fall wheat)of Luoyugou Watershed Test Station,the paper analyzed the laws of runoff and sediment yields of different pots under different slopes(10°,15°and 20°)and different rainfall patterns.The outcomes show that a)the runoff and sediment yields of different plots under different slopes of woodland is the smallest,grassland is the second and farmland is the largest;b)Under the conditions of two rainfall patterns,the average runoff of woodland is the smallest,grassland is the second and farmland is the largest.Under the conditions of rainfall patternⅠ,the average sediment yields of grassland is the smallest,woodland is the second and farmland is the largest.Under the conditions of rainfall patternⅡ,the average sediment yields of woodland is the smallest,grassland is the second and farmland is the largest and;c)There is a significant positive correlation between runoff and rainfall in grassland and there is a positive correlation between runoff and sediment yields and rainfall and between runoff and average rainfall intensity in farmland.