Effects of altered fire intervals on critical timber production and conservation values
Effects of altered fire intervals on critical timber production and conservation values
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DOI：
10.1071/wf20129
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发表时间：
2021-03-15
影响因子：
3.1
通讯作者：
Lindenmayer, David B.
中科院分区：
文献类型：
--
作者：
Cary, Geoffrey J.;Blanchard, Wade;Lindenmayer, David B.
森林在干扰间隔期表现出影响生产和自然价值的可持续性的阈值，包括锯材生产、物种存在和生境属性。火灾是温带森林的一个主要干扰因素，火灾频率正在增加，威胁着这些森林价值的可持续性。我们使用机械多样性，理论火灾间隔分布在澳大利亚维多利亚，在最近的过去和未来估计实现的概率：（一）最小锯木收获轮伐期;（二）树冠物种成熟;（三）足够的栖息地空洞的动物群。实现火灾间隔超过这些关键的林分年龄阈值的可能性显着减少，为未来的火灾制度相比，最近的过去。例如，我们估计，只有五分之一的未来火灾间隔将足够长（类似于80年），在这种森林类型的增长锯木，森林发展足够的栖息地空洞（类似于180年）的概率可能低至0.03（火灾间隔的3%）。因此，有必要重新考虑从何处可持续地获取锯材，例如从可采伐然后迅速再生的快速生长的人工林获取锯材，并保留现有80年树龄的大片森林，使其不被采伐。
Forests exhibit thresholds in disturbance intervals that influence sustainability of production and natural values including sawlog production, species existence and habitat attributes. Fire is a key disturbance agent in temperate forests and frequency of fire is increasing, threatening sustainability of these forest values. We used mechanistically diverse, theoretical fire interval distributions for mountain ash forest in Victoria, Australia, in the recent past and future to estimate the probability of realising: (i) minimum sawlog harvesting rotation time; (ii) canopy species maturation; and (iii) adequate habitat hollows for fauna. The likelihood of realising fire intervals exceeding these key stand age thresholds diminishes markedly for the future fire regime compared with the recent past. For example, we estimate that only one in five future fire intervals will be sufficiently long (similar to 80 years) to grow sawlogs in this forest type, and that the probability of forests developing adequate habitat hollows (similar to 180 years) could be as low as 0.03 (3% of fire intervals). Therefore, there is a need to rethink where sawlogs can be sourced sustainably, such as from fast-growing plantations that can be harvested and then regrown rapidly, and to reserve large areas of existing 80-year-old forest from timber harvesting.