排水量驱动了玉米系统中溶解的有机物质的浸损失
Xinlin Wang1, Diego Arruda Huggins de Sá Leitão1, Alexander J Reisinger1
1Department of Soil, Water, and Ecosystem Sciences, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Florida, 32611, USA.
The Science of the total environment
|November 15, 2025
概括
在亚热带玉米田中溶解有机碳 (DOC) 浸出主要是由排水量驱动的,而不是化肥. 像风这样的极端天气事件显著影响碳和气损失,改变了DOC的组成.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 溶解有机物 (DOM) 的浸出对于陆地生态系统中的碳转移至关重要.
- 在亚热带排列作物系统中对DOM漏动态的研究是有限的,大多数研究集中在湿地和森林.
- 了解DOM泄漏的驱动因素对于管理农业生态系统至关重要.
研究的目的:
- 评估亚热带玉米系统中溶解有机碳 (DOC) 浸出损失和组成.
- 调查环境和管理驱动因素对DOM漏动态的影响.
- 为了解决在亚热带排列作物农业中关于DOM漏的知识差距.
主要方法:
- 在佛罗里达州的玉米系统中,利用了两年的 lysimeter 观测,其中有不同的肥率.
- 在整个生长和覆盖作物季节的量化累积DOC和总 (TN) 损失.
- 分析了与排水量和季节性事件相关的DOC度和成分.
主要成果:
- 累计的DOC损失在9.74至27.56公斤/ha-1之间,而风德比造成了极端的DOC和TN损失.
- DOC损失与排水量有线相关,尽管这种关系的强度因季节而异.
- DOM的组成因季节性变化而变化,反映了DOC来源的变化,并受到土壤盘和风等事件的影响.
结论:
- 排水量是这个亚热带农业生态系统中DOC出的主要驱动因素.
- 季节性DOM成分变化表明DOC来源的变化,不总是受到化肥的影响.
- 风和地下水入侵是这些系统中调节DOM和TN动态的重要因素.
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