松华坝水源区等高反坡阶对坡耕地土壤氮含量的影响  

Effect of Reverse-slope Level Terrace on the Nitrogen Contents of Sloping Farmland in Songhuaba Reservoir

作　　者：曹鸿景 王克勤[1] 冯晓月 

机构地区：[1]西南林业大学环境科学与工程学院,云南昆明650224

出　　处：《西南林业大学学报（自然科学）》2017年第5期130-134,共5页Journal of Southwest Forestry University：Natural Sciences

基　　金：国家自然科学基金项目(30660037)资助;云南省高校优势特色重点学科(生态学)建设项目资助

摘　　要：为了合理利用坡耕地,防止种植过程中产生水土流失、保持土壤肥力,在松华坝水源区迤者小流域设置标准径流小区,布设以控制水土流失为目的等高反坡阶试验,探讨等高反坡阶土壤氮含量年动态变化规律。结果表明:氮素流失量与地表径流量和泥沙产量显著相关,设置等高反坡阶对地表径流量的削减率9.68%~36.84%,平均削减率23.54%,对土壤侵蚀量的削减率40.98%~71.68%,平均削减率56.62%;雨季后对比发现,布设等高反坡阶的土壤全氮含量较对照高53.97%;对照地土壤水解氮含量消减率42%,等高反坡阶地土壤水解氮含量消减率25%,两者差异显著。说明设置等高反坡阶能有效减少氮素流失,保持土壤氮素含量,并减少坡耕地地表径流导致的土壤流失。In order to reasonable utilization of slope land, and preservation of fertility, this study set standard reverse-slop level terrace in the watershed runoff plots within planting, for finding the dynamic variation of the soil nitrogen content of reverse-slop level terrace. Researches show that nitrogen loss, surface runoff and sediment yield correlated significantly, the reduction rate of the higher antislope to surface runoff was 9.68%-36. 84% and the average reduction rate was 23.54 percent, and the reduction in soil erosion was 40. 98%-71.68%, with an average reduction rate of 56.62% ; After the rainy season, the level of soil nitrogen content is 53.97% higher than that of the higher anti-slope; The reduction rate of nitrogen was 42%, the reduction rate of nitrogen was 25%, and the difference was significant. It shows that the reverse-slop level terrace can effectively reduce the loss of nitrogen, keep the nitrogen content of the soil, and reduce the soil loss caused by the runoff of land surface runoff.

关 键 词：土壤 氮素 等高反坡阶地 坡耕地 松华坝 

分 类 号：S714.7[农业科学—林学]