【摘 要】
：
指出了横坡垄作具有涵养水源 ,减少地表径流与土壤肥力流失的优点 ,已被广泛应用于坡耕地.由于具体实施中难以精确等高控制 ,导致垄向坡度的存在 ,在垄沟内聚集大量雨水引起
【机 构】
：
College of Population,Linyi University/Shandong Provincial Key laboratory of Water and Soil Conserv
论文部分内容阅读
指出了横坡垄作具有涵养水源 ,减少地表径流与土壤肥力流失的优点 ,已被广泛应用于坡耕地.由于具体实施中难以精确等高控制 ,导致垄向坡度的存在 ,在垄沟内聚集大量雨水引起横垄垮塌 ,造成细沟侵蚀.利用人工模拟降雨实验及三维立体扫描技术对细沟形态的影响因素及其形态特征进行了分析 ,结果发现 :增加垄高能够明显增加细沟最大沟宽与最大沟深 ;渗流对最大细沟宽度的影响呈二次函数 ,当细沟最大宽度大于14 .3cm时 ,渗流与细沟最大宽度有正影响 ,当细沟最大宽度低于此值时 ,为负影响 ;渗流对细沟最大深度为正影响 ;总产沙量与渗流的关系也呈二次函数 ;细沟最大宽度的增加速率是细沟最大深度的1 .7倍 ;在已有的细沟体积预测模型L-V模型(V= aLb )的基础上 ,纳入细沟最大深度提出了横坡垄作条件下的简便细沟体积预测模型(V= a*(D*L)b) ,R2 从0.61提高到0.92 ,模型预测精度显著提高.
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