水土保持学报2017，Vol.31Issue(2)：92-96,110,6.DOI:10.13870/j.cnki.stbcxb.2017.02.017
东北坡耕地春季融雪侵蚀观测研究
Observation on the Spring Snowmelt Erosion of Sloping Farmland in Northeast China
摘要
Abstract
In order to study the erosion caused by spring snowmelt of sloping farmland in Northeast China and the affecting factors,in-situ observation was carried out on a sloping farmland in a small watershed in Jixing,Jilin province.The changes of runoff and sediment yield during snowmelt were analyzed,the effects of factors such as snowmelt runoff and soil thawing depth on snowmelt erosion were investigated,and processes and change rules of snowmelt erosion of the sloping farmland were explored.The results showed that,under the meteorological conditions of the average temperature of 0 to 3.8 ℃C,spring snowmelt erosion was relatively concentrated,runoff and sediment yield increased first and then decreased.Snowmelt runoff and soil thawing depth were important factors affecting snowmelt erosion.In the early stage,runoff from melting snow increased dramatically,and accounted for 59.15％ of the total snow melting period,soil was frozen at the same time.In the middle stage,snowmelt tended to stabilize,surface soil began to thaw,runoff decreased and sediment yield continued to increase,the amount of erosion reached the maximum and accounted for 41.74％ of the total erosion.At the end,there was no snow on the slope,and the depth of soil thawing increased,runoff decreased and sediment concentration reached the maximum (8.00 kg/m3).Spring snowmelt erosion of sloping farmland was affected by the topographic changes of ridge area and catchment basin,runoff and sediment yield showed a strong regularity.When their peak frequency was consistent,runoff and sediment showed an "8" cycle lag relationship,but showed a compound cycle lag relationship when their peak frequency was inconsistent.关键词
融雪径流/解冻深度/侵蚀过程/坡耕地Key words
snowmelt runoff/thawing depth/erosion process/sloping farmland分类
农业科技引用本文复制引用
华文杏,范昊明,许秀泉,贾燕锋,刘雨佳,谭娟,张娜..东北坡耕地春季融雪侵蚀观测研究[J].水土保持学报,2017,31(2):92-96,110,6.基金项目
国家自然科学基金项目“东北黑土低山丘陵区融雪侵蚀机理与过程研究”(41371272) （41371272）
