水平上升后的土壤温室气体动态 - - 泥炭地森林中选择性采摘的影响
Mikko Peltoniemi1, Qian Li1, Pauliina Turunen2
1Natural Resources Institute Finland (Luke), Latokartanonkaari 9, 00790 Helsinki, Finland.
The Science of the total environment
|July 20, 2023
概括
在北极泥炭地采摘选择性收获提高了水表水平,但没有显著减少温室气体排放. 需要进一步进行水文管理,以减少这些管理生态系统的排放.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 林业 林业 林业 林业 林业
背景情况:
- 经营的北极泥炭地是温室气体 (GHG) 的重要来源.
- 土壤平面水位 (WT) 极大地影响有氧和无氧过程,控制温室气体的吸收和来源.
- 选择性收获被提议增加WT,可能减少净温室气体排放,同时保持树木生长.
研究的目的:
- 为了研究选拔采摘引起的地下水位上升对挪威杉木占主导地位的泥炭地土壤温室气体 (CO2,CH4,N2O) 动态的影响.
- 分析土壤气体度的垂直分布及其与WT的关系.
- 评估收获对土壤温室气体流量的净影响.
主要方法:
- 监测不同深度 (高达80厘米) 的土壤CO2,CH4,N2O和O2度.
- 从土壤表面测量CO2和CH4的流量.
- 来自芬兰南部精选收获和未收获的对照片段的数据比较.
主要成果:
- 选择收获增加了WT平均14厘米.
- 土壤气体度,特别是CO2和CH4,显示出与WT相关的强烈的垂直梯度.
- 在WT附近和上面的泥炭层中消耗了甲 (CH4),这表明正在进行氧化.
- 表面泥炭 (上25/30厘米) 是二氧化碳排放的主要来源;更深的土壤 (下45/50厘米) 在收获后的二氧化碳排放量略有增加.
- 氧化 (N2O) 产量发生在WT以上,不受收获的影响.
结论:
- 从选择性收获中观察到的WT增加不足以减少土壤温室气体总体排放.
- 需要进行额外的水文监管,以有效减少这些经营的泥炭地产的温室气体排放.
- 森林管理实践需要考虑综合水文管理,以缓解泥炭地生态系统的气候变化.
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