Peatland Wildfire Severity and Post-fire Gaseous Carbon Fluxes
Peatland Wildfire Severity and Post-fire Gaseous Carbon Fluxes
复制标题
DOI：
10.1007/s10021-020-00545-0
复制
发表时间：
2020-08-31
期刊：
影响因子：
3.7
通讯作者：
Levy, Peter E.
中科院分区：
文献类型：
--
作者：
Gray, Alan;Davies, G. Matt;Levy, Peter E.
考虑到当前和预测的环境变化，泥炭地作为碳储存/汇的未来地位是不确定的。有几个因素可以影响泥炭地碳汇的大小，包括野火等干扰。目前，很少有证据表明野火如何影响二氧化碳（CO2）和甲烷（CH 4）的排放，通过扰动有氧和无氧呼吸。最大的影响，这可能会根据野火的严重程度而有所不同，预计将在火灾后的立即阶段，当几乎没有恢复发生。在这里，我们调查了五个英国泥炭地野火（2011-2012年）在野火后立即测量CO（2）和CH（4）通量使用静态室。火灾的严重程度是用一个修改后的形式的综合燃烧指数。一个分层分区的方法表明，时间，因为火灾是最强烈的相关变量，CO2和CH（4）的通量，其次是土壤温度的CO（2）和火灾的严重程度为CH 4。使用线性混合建模方法来解释重复测量;火灾严重度是CH（4）的重要术语，对CO2具有边界显著性。CH（4）的平均通量一直较低的烧伤网站。相比之下，来自苏格兰北部火灾的数据似乎显示了CH（4）的相反关系，在烧毁的网站上有更高的通量。这些结果表明，野火可以影响气体碳通量，但响应可以在空间和时间上是可变的，厌氧过程的破坏可能是网站和/或火灾依赖。
The future status of peatlands as carbon stores/sinks is uncertain given current and predicted environmental change. Several factors can affect the magnitude of the peatland carbon sink including disturbances such as wildfire. There is at present little evidence of how wildfire affects the emission of carbon dioxide (CO2) and methane (CH4) via perturbation to aerobic and anaerobic respiration. The greatest effects, which are likely to vary according to wildfire severity, would be expected in the immediate post-fire stages when little recovery has taken place. Here, we investigate five UK peatland wildfires (2011-2012) in the immediate post-wildfire period measuring CO(2)and CH(4)fluxes using static chambers. Fire severity was described using a modified form of the composite burn index. A hierarchical partitioning approach indicated time since fire was the most strongly associated variable that fluxes of both CO2, and CH(4)followed by soil temperature for CO(2)and fire severity for CH4. Using a liner mixed modelling approach to account for repeated measures; fire severity was a significant term for CH(4)and borderline significant for CO2. Mean fluxes of CH(4)were consistently lower on burnt sites. In contrast, data from a fire in the north of Scotland appeared to show the opposite relationship for CH(4)with higher fluxes on the burnt sites. These results suggest that wildfire can affect gaseous carbon fluxes, but the responses can be variable in both space and time and that disruption to anaerobic processes may be site and/or fire dependent.