亚热带森林中溶解有机碳动态的长期趋势,以应对环境变化
1State Key Laboratory of Pollution Control & Resource Reuse and School of Environment, Nanjing University, Nanjing 210023, Jiangsu, China.
Environmental science & technology
|July 4, 2024
概括
由于空气更清洁,通风中的溶解有机碳 (DOC) 沉积量正在减少,而土壤和河流的DOC正在增加. 这些变化会影响森林碳循环和储存.
科学领域:
- 环境科学 环境科学
- 森林生态 森林生态
- 生物地质化学生物地质化学
背景情况:
- 溶解有机碳 (DOC) 动态对于森林碳循环至关重要,对全球环境变化敏感.
- 了解长期的DOC趋势对于评估生态系统稳定性和碳封存至关重要.
研究的目的:
- 分析中国亚热带地区的水源流域中DOC动态和水化学的长期趋势 (2001-2020年).
- 通过各种水文途径 (通过降水,垃圾水,土壤和溪水) 调查DOC运输.
- 评估环境和气候变化对DOC动态的影响.
主要方法:
- 收集和分析了19年来通过布,垃圾浸液,土壤水 (多次深度) 和流水的DOC和水化学数据.
- 量化年度DOC沉积量和流出量.
- 利用统计分析来确定长期趋势,并将其与环境因素相关联.
主要成果:
- 通过落的年度DOC沉积量为14.2 ± 2.2 g C m−2 年−1,流出量为1.87 ± 0.83 g C m−2 年−1.1.
- 通过降落DOC沉积的显著下降趋势 (-0.195毫克C L-1年−1) 被观察到,与空气污染的减少有关.
- 土壤和河流水中的DOC度呈现上升趋势,归因于减少的酸沉积,并受到温度上升和降水的影响.
结论:
- 清洁空气政策导致森林树冠中的DOC沉积减少,而缓解酸雨则增加了土壤和溪水中的DOC.
- 气温和降水的上升有助于增加DOC出.
- 观察到的DOC动态对区域陆地和水上碳汇的稳定性有重大影响.
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