Leaving moss and litter layers undisturbed reduces the short-term environmental consequences of heathland managed burns.
Leaving moss and litter layers undisturbed reduces the short-term environmental consequences of heathland managed burns.
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DOI：
10.1016/j.jenvman.2017.08.017
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发表时间：
2017-12
影响因子：
8.7
通讯作者：
Roger Grau‐Andrés;G. Matt Davies;S. Waldron;E. Scott;A. Gray
中科院分区：
文献类型：
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作者：
Roger Grau‐Andrés;G. Matt Davies;S. Waldron;E. Scott;A. Gray
地面可燃物结构的变化，即苔藓和凋落物（M/L）层，可能是一个重要的控制火灾的严重性，在石楠沼泽地，从而影响植被再生和土壤碳动态。我们完成了实验火灾在aCalluna vulgaris为主的石南荒原研究的M/L层的作用，在确定（一）火灾引起的温度脉冲到土壤和（ii）火灾后的土壤热动力学。手动删除M/L层燃烧前增加火灾引起的土壤加热，无论是在土壤表面和2厘米以下。烧毁的情节中的M/L层被删除后，地面燃料被消耗，但土壤不点燃的高严重性火灾模拟燃料结构。在手动删除的M/L层，无论是之前或之后的火灾，火灾后的土壤热动力学表现出较大的昼夜和季节变化，以及类似的模式后观察到的野火，相比烧毁的地块，其中的M/L层没有被操纵。我们用土壤温度来探讨火灾后土壤呼吸的潜在变化。模拟高火灾的严重程度（手动删除的M/L层）增加估计土壤呼吸在温暖的月份。随着预计的火灾制度向更严重的火灾转移，我们的研究结果可以帮助土地管理者制定战略，以平衡生态系统服务inCalluna占主导地位的栖息地。
Variation in the structure of ground fuels, i.e. the moss and litter (M/L) layer, may be an important control on fire severity in heather moorlands and thus influence vegetation regeneration and soil carbon dynamics. We completed experimental fires in aCalluna vulgaris-dominated heathland to study the role of the M/L layer in determining (i) fire-induced temperature pulses into the soil and (ii) post-fire soil thermal dynamics. Manually removing the M/L layer before burning increased fire-induced soil heating, both at the soil surface and 2 cm below. Burnt plots where the M/L layer was removed simulated the fuel structure after high severity fires where ground fuels are consumed but the soil does not ignite. Where the M/L layer was manually removed, either before or after the fire, post-fire soil thermal dynamics showed larger diurnal and seasonal variation, as well as similar patterns to those observed after wildfires, compared to burnt plots where the M/L layer was not manipulated. We used soil temperatures to explore potential changes in post-fire soil respiration. Simulated high fire severity (where the M/L layer was manually removed) increased estimates of soil respiration in warm months. With projected fire regimes shifting towards higher severity fires, our results can help land managers develop strategies to balance ecosystem services inCalluna-dominated habitats.