坡面水分和养分渗透模拟研究

Simulating research on water and nutrient percolation and runoff down sloping land

利用室内人工降雨模拟装置,通过坡面小区试验,初步分析了黄绵土坡面上水分和养分的渗透规律。结果表明:由坡顶到坡脚,水分入渗深度和入渗量均增加,即坡脚水分含量高于坡顶;不同的养分其渗透能力有所差别,很容易在某一层富集,硝态氮入渗快、数量多,速效钾入渗慢、数量少;硝态氮迁移受水分运动影响明显,而速效钾受水分运动影响较小。

With the equipment for indoor artificial precipitation and the simulating experiments on sloping plots,the moisture and nutrients permeation laws of loessal sloping land are analyzed primarily.The results showed that the depth and the amount of moisture permeation are on the gradual increase from top to foot down the slop,i.e.,the moisture content at the foot of the sloping land is higher than that of the slop top,that individual nutrients showed different permeation performances and each accumulate in specific layer easily,that nitrate nitrogen permeated rapidly and in greater amount in comparison to quick-acting potassium and that the transfer of nitrate nitrogen is evidently affected by transportation of moisture,while the transfer of the rapid available potassium is less affected by that transportation.