松华坝水源区等高反坡阶对坡耕地土壤氮含量的影响

发布时间：2018-03-04 15:11

本文选题：土壤　切入点：氮素　出处：《西南林业大学学报(自然科学)》2017年05期 　论文类型：期刊论文

【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。
[Abstract]:In order to make rational use of sloping farmland, prevent soil erosion and maintain soil fertility during planting, a standard runoff plot was set up in the small watershed of Yiyi River Source area of Songhua Dam, and a high slope scale test was set up to control soil and water loss. The annual dynamic change of soil nitrogen content was studied. The results showed that the amount of nitrogen loss was significantly related to surface runoff and sediment yield. The reduction rate of surface runoff is 9.68%, the average cutting rate is 23.54, the reduction rate of soil erosion is 40.98% and 71.68%, and the average reduction rate is 56.62% after the rainy season. The soil total nitrogen content was 53.97 higher than that of the control, the soil hydrolysate nitrogen abatement rate was 42% and the soil hydrolytic nitrogen content reduction rate was 25% in the control land. The difference between them was significant. Maintain soil nitrogen content and reduce soil loss caused by surface runoff on sloping farmland.
【作者单位】：西南林业大学环境科学与工程学院;
【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
【分类号】：S153.6

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