土地改造对环境条件和热带泥炭地甲排放的影响
Guan Xhuan Wong1, Ryuichi Hirata2, Takashi Hirano3
1Sarawak Tropical Peat Research Institute, Kota Samarahan, Malaysia.
The Science of the total environment
|January 15, 2025
概括
热带泥炭地是主要的甲 (CH4) 来源. 土地转化为油棕种植园增加了CH4排放,与预期相反,突出了排水沟和燃烧对全球CH4预算的影响.
科学领域:
- 环境科学 环境科学
- 气候变化研究 气候变化研究
- 生物地质化学生物地质化学
背景情况:
- 热带泥炭地是甲 (CH4) 的重要来源,甲是一种强大的温室气体.
- 准确量化这些生态系统的CH4排放对于全球气候模型至关重要.
- 缺乏长期的高频流量测量,阻碍了精确的预算估计.
研究的目的:
- 在热带泥炭沼泽森林转化为油棕种植园期间量化甲 (CH4) 交换 (NEE-CH4).
- 评估土地利用变化,排水和燃烧对CH4排放的影响.
- 为提炼全球CH4预算提供数据.
主要方法:
- 采用了状共变率技术来测量生态系统的净CH4交换 (NEE-CH4).
- 在七年期间 (2014-2020年) 进行的测量,涵盖转换前,转换期间和转换后的阶段.
- 监测的环境变量包括地下水位,土壤温度,净辐射 (Rn) 和蒸汽压力缺陷 (VPD).
主要成果:
- 即使在转换和排水后,热带泥炭地仍然是CH4的净来源.
- 与转换前期相比,转换期间和之后的甲排放量显著增加.
- 排水沟和控制燃烧被确定为导致CH4释放量增加的关键因素.
结论:
- 热带泥炭地的土地转型大大改变了CH4的动态,增加了排放.
- 排水沟在转换后的CH4排放中的作用至关重要,需要进一步调查.
- 在所有转换阶段进行准确,连续的流量测量对于全球CH4预算改进至关重要.
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