南卡罗来纳州生物质燃烧对土壤NO排放的规定的影响
Olivia R Steinbeck1, Wendell W Walters2
1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA.
Scientific reports
|October 6, 2025
概括
在南卡罗来纳州的森林中,规定的燃烧并没有增加土壤的氧化 (NOx) 排放. 土壤NOx流量仍然很低,这表明自然森林土壤对区域NOx预算的贡献很小.
科学领域:
- 大气化学 大气化学
- 土壤科学 土壤科学
- 生态生态学 生态生态学
背景情况:
- 氧化 (NOx) 是影响空气质量和大气化学的重要微量气体.
- 虽然人为的氧化物排放量下降,但土壤排放等自然来源获得相对重要.
- 生物质燃烧影响土壤循环和NO流,但有控制的研究很少.
研究的目的:
- 为了研究规定的燃烧对土壤的影响,南卡罗来纳州森林生态系统中NO排放.
- 测量不同强度燃烧前后的土壤NO流量.
- 评估森林土壤NOx排放对区域预算的贡献.
主要方法:
- 在规定的燃烧之前和之后,从沙丘生态系统 (树,长叶松树,线草) 收集了土壤核.
- 测量了土壤的pH值,酸盐和水平.
- 用定制的土壤室化方法量化了土壤NO流量.
- 用酸添加剂来测试的可用性影响.
主要成果:
- 在燃烧前和燃烧后的样本之间没有观察到土壤pH,酸盐或的显著差异.
- 平均土壤NO流量很低 (0.056±0.068 ng-N h−1 g−1),其中大部分低于检测极限.
- 只有在添加酸后才发生显著的NO排放,这表明的限制.
- 估计来自自然森林土壤的全州NO排放量为每月700 ± 800公 (总量的5.0 ± 6.0%).
结论:
- 规定的火灾不会增加土壤NO排放在限,酸性美国东南部森林立即火灾后.
- 森林土壤排放占该地区地区NO预算的小部分.
- 的可用性是控制土壤NO排放的关键因素.
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