论文部分内容阅读
通过野外人工模拟降雨试验,得出湖北省象鼻嘴小流域内2个板栗林梯地、2个花生农地(梯地、坡地各1个)径流小区在同等雨强条件下的产流产沙过程变化特征。结果显示:在水热状况、土壤、小地形等条件较一致的前提下,4个径流小区的初损雨量、历时表现为板栗梯地1>板栗梯地2>花生梯地>花生坡地;结合各径流小区产流产沙强度及累计过程线分析得出,梯地的水土保持效果明显优于坡地,坡地的产流产沙过程更为复杂;林地在拦蓄径流、增加入渗方面要明显优于农地;板栗梯地1,2的水沙流失特征差异显示出植被盖度、物种多样性等对地表产流产沙过程也有较大影响;各场雨的累计产流、产沙量与降雨历时之间符合Y=ax2+bx+c的多项式相关方程。
Through simulated artificial rainfall experiment in the field, two runoff plots of chestnut forest and two peanut runoff plots in Xiangzui mouth watershed of Hubei Province were obtained. Process change characteristics. The results showed that the initial rainfall loss of four runoff plots was consistent with that of chestnut terraces 1> chestnut terraces 2> peanut terraces> peanut slopes under the same water and heat conditions, soil and small topography; Runoff yield and sediment yield intensity of all runoff plots and cumulative process line analysis showed that soil and water conservation effects of slope land were significantly better than that of slope land. The process of runoff and sediment production on slope land was more complicated. The runoff and infiltration of forest land was significantly better than that of runoff The differences of water and sediment loss in the chestnut terraces 1 and 2 showed that vegetation cover and species diversity had a significant impact on surface runoff and sediment yield. The accumulated runoff, sediment yield and rainfall duration A polynomial correlation equation that conforms to Y = ax2 + bx + c.