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评估降雨强度和斜坡梯度对冲流过程和通过模拟降雨下的表面流和交流通过溶解有机碳损失的影响
1School of Software Engineering, Chengdu University of Information Technology, Chengdu, Sichuan, China.
PloS one
|January 23, 2026
概括
交流是紫色土壤中溶解有机碳 (DOC) 损失的重要途径,特别是在降雨强度低的情况下. 了解这些水文路径对于管理这些地区的碳损失至关重要.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 水文学的水文学
背景情况:
- 溶解有机碳 (DOC) 对全球碳循环至关重要.
- 之前关于DOC损失的研究主要集中在表面流量上,忽视了交流通道.
- 关于互流在DOC运输和紫色土壤损失中的作用的研究有限.
研究的目的:
- 调查交流和地表流的水文路径.
- 在不同降雨强度和斜坡梯度下,通过交流和表面流量量化溶解有机碳 (DOC) 损失.
- 确定互流作为紫色土壤中DOC运输机制的重要性.
主要方法:
- 进行了不同强度 (60,90,120毫米/小时) 和斜坡梯度 (5°,15°,25°) 的降雨模拟.
- 监控的表面流量和间流启动时间,流量和体积.
- 分析了溶解有机碳 (DOC) 度,并计算了两条流道的DOC损失流.
主要成果:
- 间流被确定为一个重要的水文通道,在特定条件下 (R60-S5) 贡献高达69.2%的总流量.
- 间流DOC度是表面流DOC度的1.352.34倍.
- 在降雨强度低 (R60) 的情况下,通过交流流的DOC损失占主导地位,而在较高强度下 (R90,R120) 的表面流则占主导地位.
- 排水量显示,在表面流量 (R2=0.93) 和间流量 (R2=0.99) 中,与DOC损失流量有很强的正线性相关性.
结论:
- 互流在紫色土壤中溶解有机碳 (DOC) 运输和损失方面发挥着关键作用.
- 降雨强度和坡度显著影响交流对总流量和DOC损失的贡献.
- 这些发现为估计DOC流量和实施紫色土壤地区碳损失管理策略提供了必要的数据.
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