火灾减少了土壤酸盐的保留,同时增加了全球的土壤生产和损失
Qilin Zhu1,2, Juan Liu3, Lijun Liu1,2
1School of Tropical Agriculture and Forest, Hainan University, Haikou 570228, China.
Environmental science & technology
|December 16, 2024
概括
野火增加了土壤矿化和,但减少了酸盐固定,增加了通过漏的损失. 这些影响,包括更高的氧化排放,主要是短暂的,持续不到一年.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
背景情况:
- 了解火灾后的土壤 (N) 转化对于预测N的可用性和损失至关重要.
- 缺乏关于火灾如何影响内部土壤总N转化率的全球数据.
研究的目的:
- 为了研究总土壤N转化对火的一般反应.
- 为了确定火灾对N可用性和损失的后果.
主要方法:
- 土壤总N转化率的量化. 土壤总N转化率.
- 测量土壤和酸盐度.
- 对土壤C/N比率的分析.
- 对氧化 (N2O) 和氧化 (NO) 排放的监测.
- 对N泄漏的评估.
主要成果:
- 火灾显著增加了总N矿化 (+38%) 和氨度 (+47%),与较低的土壤C/N比率有关.
- 微生物酸盐不动化 (I_NO) 减少了56%,导致N2O (+50%) 和NO (+121%) 排放量增加.
- 漏大幅增加 (+308%),在火灾发生后不久 (<1年) 和火灾发生后很长时间 (>1年) 均观察到影响.
- 对的可用性和N2O排放的刺激作用是暂时的 (持续时间<1年),而泄漏仍然是一个持久的风险.
结论:
- 火灾通过刺激的产生和减少酸盐的保留,改变了土壤的循环.
- 短期 (<1年) 的火灾后情况显示,的可用性和N2O排放量有所增加.
- 长期的火灾后条件存在通过漏而导致N损失的持续风险.
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