经济林地坡长对侵蚀产沙动态过程影响的模拟  

Simulation on Influence of Slope Length on Erosion Sediment Yield Process in Economic Forest

作　　者：付兴涛[1,2,3] 张丽萍[1,2,3] 叶碎高[4] 

机构地区：[1]浙江省亚热带土壤与植物营养重点研究实验室,杭州310029 [2]污染环境修复与生态健康教育部重点实验室,杭州310029 [3]浙江大学环境与资源学院土水资源与环境研究所,杭州310029 [4]浙江省水利河口研究院,浙江广川工程咨询有限公司,杭州310020

出　　处：《水土保持学报》2010年第4期73-77,共5页Journal of Soil and Water Conservation

基　　金：浙江省低丘缓坡水土流失防治对策研究项目(RI0701)

摘　　要：经济林经营是低丘缓坡土地利用的主要方式之一,为了研究低丘缓坡经济林地坡长对坡面侵蚀产沙过程的影响规律,本研究以浙江省常山县胡柚林地为例,通过野外人工模拟降雨试验法,分析探讨了该经济林坡地的侵蚀产沙情况,得出如下结论:(1)相近雨强下,坡面产沙量随坡长的延长而增加,第24 min达到峰值,坡长6 m是该经济林地产沙量显著增加的过渡坡长,建议种植胡柚林时其最大行间距不得超过6 m,最好小于4 m进行布局。(2)该经济林地不同坡长下产沙模数与径流深的关系用三次函数描述,随径流深的增加产沙模数先缓慢增加到峰值,趋于平稳,后迅速增大。(3)相同坡长下,随降雨强度的增大产沙量总体呈增大趋势,1.2 mm/min雨强是该地侵蚀性降雨的下限,应加强该林地坡面排水设施的建设及注意林地表面植被的维护与更新。(4)雨强对坡面侵蚀的影响大于坡长造成的影响,且随着坡长的延长,大雨强下坡面侵蚀产沙量增幅明显。The economic forest management is one of the main land use modes on low hill gentle slope,in order to research the influence disciplinarian of the impact of slope length on the processes of erosive sediment yield here,based on the field simulated rainfall and taking Huyou forest in Changshan county of Zhejiang province for example,this study analyzed the sediment yield processes and obtained results as follows：（1） under near rainfall intensity,sediment yield increased with increasing slope length and achieved peak value at 24th min.There was an obvious increase of sediment yield on 6 m slope length,so soil loss would be mitigated with distribution of planting trees not excess 6 m,may as well less than 4 m.（2） Relationship between sediment modulus and runoff depth can be described by cubic equation,which indicated that sediment modulus increased slowly to a peak value,then be balanced,and lastly,it turned to be a sharp increase.（3）There was an increasing tendency of sediment yield as a whole under the same slope length,and 1.2 mm/min rainfall intensity is a lowest limit of erosive rainfall.（4）The impact of rainfall intensity on slope erosion greater than that of slope length and there was visible increase under high intensity with increasing slope length.

关 键 词：低丘缓坡 经济林 坡长 模拟降雨 累积产沙量 

分 类 号：S157.1[农业科学—土壤学]