Moderate drop in water table increases peatland vulnerability to post-fire regime shift.
Moderate drop in water table increases peatland vulnerability to post-fire regime shift.
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DOI：
10.1038/srep08063
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发表时间：
2015-01-27
影响因子：
4.6
通讯作者：
Waddington JM
中科院分区：
文献类型：
--
作者：
Kettridge N;Turetsky MR;Sherwood JH;Thompson DK;Miller CA;Benscoter BW;Flannigan MD;Wotton BM;Waddington JM
北部和热带泥炭地是在数千年的涝渍条件下积累的全球重要的碳储备。目前尚不清楚北部泥炭地预测的适度干燥是否会刺激燃烧和碳损失，就像较小的热带泥炭地那样，由于严重的排水和深层泥炭火灾，碳遗留物已不稳定。利用独特的长期实验，我们量化了经过十年排水的北部泥炭地的野火后恢复情况。我们表明，预测大多数北部地区地下水位位置的适度下降会引发先前仅在受到严重干扰的热带泥炭地中观察到的植被组成的变化。适度排水和野火的综合影响将生产力低下、以苔藓为主的泥炭地转变为非碳积累的灌木草生态系统。这个新的生态系统可能会经历低强度、高频率的野火，这将进一步耗尽储存的泥炭碳。
Northern and tropical peatlands represent a globally significant carbon reserve accumulated over thousands of years of waterlogged conditions. It is unclear whether moderate drying predicted for northern peatlands will stimulate burning and carbon losses as has occurred in their smaller tropical counterparts where the carbon legacy has been destabilized due to severe drainage and deep peat fires. Capitalizing on a unique long-term experiment, we quantify the post-wildfire recovery of a northern peatland subjected to decadal drainage. We show that the moderate drop in water table position predicted for most northern regions triggers a shift in vegetation composition previously observed within only severely disturbed tropical peatlands. The combined impact of moderate drainage followed by wildfire converted the low productivity, moss-dominated peatland to a non-carbon accumulating shrub-grass ecosystem. This new ecosystem is likely to experience a low intensity, high frequency wildfire regime, which will further deplete the legacy of stored peat carbon.
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影响因子：
3.7
作者：
Benscoter, Brian W.;Vitt, Dale H.
通讯作者：
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