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Ecosystem scale evapotranspiration and CO2 exchange in burned and unburned peatlands: Implications for the ecohydrological resilience of carbon stocks to wildfire
Ecohydrology ( IF 2.5 ) Pub Date : 2020-01-16 , DOI: 10.1002/eco.2189
M. Q. Morison 1 , R. M. Petrone 1 , S. L. Wilkinson 2 , A. Green 1 , J. M. Waddington 2
Affiliation  

Boreal peatlands represent a significant global store of soil carbon, which are subject to increasing natural and anthropogenic disturbance. Wildfire is the single largest disturbance to boreal forest and wetlands annually. Critical to the long‐term carbon storage function in peatlands is the (re‐)establishment of a near‐surface water table following wildfire. This has been recently shown to in part be facilitated by post‐fire reductions in water losses via evapotranspiration (ET). However, reduced ET may also have cascade impacts on other ecohydrological processes in recovering peatlands, such as a reduction in carbon sequestration. To investigate the linked cycles of evaporative loss and carbon exchange in burned peatlands, the burned and unburned peatlands in Alberta, Canada, were instrumented with eddy covariance systems to monitor continuous fluxes of energy, carbon dioxide, and water vapour, over two summer seasons (2013 and 2014; 2–3 years post‐burn). The burned site showed significant changes to respiration and productivity and a shift in the partitioning of available energy (significantly larger Bowen ratio; mean values of 1.19 and 1.10 at the burned and unburned sites, respectively), as well as a significant reduction in ET rates. Decreases in respiration did not offset the decrease in primary productivity, and the burned site was significantly less productive than the reference site on a net production basis for the available data period. This provides direct observations of ET and CO2 fluxes at a novel ecosystem scale to show the impacts of fire on short‐term (2–3 years) post‐burn ecosystem ecohydrological function.

中文翻译:

燃烧过的和未燃烧过的泥炭地的生态系统规模蒸散量和CO2交换:碳库对野火的生态水文适应力的含义

北方泥炭地是全球重要的土壤碳储量,自然碳和人为干扰不断增加。野火是每年对北方森林和湿地造成的最大干扰。泥炭地长期碳储存功能的关键是在野火之后(重新)建立近地表水位。最近表明,通过蒸散(ET)减少火灾后的水损失,可以部分地促进这一点。但是,减少的ET可能还会对恢复泥炭地的其他生态水文过程产生级联影响,例如减少固碳。为了调查加拿大艾伯塔省被烧过的泥炭地,烧毁和未烧过的泥炭地蒸发损失和碳交换的相关循环,在两个夏季(2013年和2014年;燃烧后2-3年)内,使用涡旋协方差系统监测连续的能量,二氧化碳和水蒸气通量。燃烧过的部位显示出呼吸和生产力的显着变化,可用能量的分配发生了变化(明显的鲍恩比;燃烧和未燃烧部位的平均值分别为1.19和1.10),并且ET率显着降低。呼吸的减少并不能抵消初级生产力的下降,在可用数据期内,以净产量计,被烧伤的地点的生产力明显低于参考地点。这提供了对ET和CO的直接观察 燃烧过的部位显示出呼吸和生产力的显着变化,可用能量的分配发生了变化(明显的鲍恩比;燃烧和未燃烧部位的平均值分别为1.19和1.10),并且ET率显着降低。呼吸的减少并不能抵消初级生产力的下降,在可用数据期内,以净产量计,被烧伤的地点的生产力明显低于参考地点。这提供了对ET和CO的直接观察 燃烧过的部位显示出呼吸和生产力的显着变化,可用能量的分配发生了变化(明显的鲍恩比;燃烧和未燃烧部位的平均值分别为1.19和1.10),并且ET率显着降低。呼吸的减少并不能抵消初级生产力的下降,在可用数据期内,以净产量计,被烧伤的地点的生产力明显低于参考地点。这提供了对ET和CO的直接观察 呼吸的减少并不能抵消初级生产力的下降,在可用数据期内,以净产量计,被烧伤的地点的生产力明显低于参考地点。这提供了对ET和CO的直接观察 呼吸的减少并不能抵消初级生产力的下降,在可用数据期内,以净产量计,被烧伤的地点的生产力明显低于参考地点。这提供了对ET和CO的直接观察在一个新的生态系统尺度上的2个通量,以显示火灾对燃烧后短期(2-3年)生态系统生态水文学功能的影响。
更新日期:2020-01-16
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