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降雨特征和甘生长阶段对土壤的影响以及气损失
Renxiang Yang1, Jiashun Zheng1, Guifang Li2
1Guangxi Key Laboratory for Agro-Environment and Agro-Product Safety, College of Agriculture, Guangxi University, Nanning, China.
概括
在中国南部的甘山坡上,高强度的降雨造成了严重的土壤侵蚀和气损失,特别是在播种阶段. 降雨强度和生长阶段是影响这些环境问题的关键因素.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 农业科学 农业科学
背景情况:
- 中国南部的高强度降雨加剧了斜坡农田的土壤侵蚀,导致生态和环境退化.
- 对于降雨特征和甘生长阶段在自然降雨条件下对土壤侵蚀和损失的联合影响的理解有限.
研究的目的:
- 调查降雨因素和甘生长阶段对土壤侵蚀和甘种植斜坡的气损失的影响.
- 量化降雨强度和数量的对地表排水,土壤侵蚀和气损失的影响.
- 确定导致土壤和气损失的关键降雨特征和生长阶段.
主要方法:
- 在2019年和2020年5月至9月的自然降雨事件期间进行了现场排水地图观测.
- 在不同的甘生长阶段 (播种,耕作,延长) 测量了表面流水,土壤侵蚀和损失.
- 采用路径分析来量化降雨因素和甘生长阶段对测量损失的影响.
主要成果:
- 总表面流失,土壤侵蚀和损失分别为4354.1 m3/ha,155.4 t/ha和25.87 kg/ha,主要发生在种植阶段 (SS).
- 的损失主要是表面流失 (76.1%),主要是作为酸 (NO3−-N,92.9%).
- 最大降雨强度 (I15,I60,I30) 显著影响了排水,侵蚀和气损失,直接路径系数因损失成分和降雨特征而异.
结论:
- 播种阶段是甘坡上土壤和气损失的主要时期.
- 降雨特征,特别是强度,是表面流失,土壤侵蚀和损失的关键驱动因素.
- 了解这些相互作用为管理土壤侵蚀和量化甘种植中的降雨侵蚀因素提供了至关重要的理论支持.
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