Interactions between landscape and local factors inform spatial action planning in post-fire forest environments
Interactions between landscape and local factors inform spatial action planning in post-fire forest environments
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景观与当地因素之间的相互作用为火灾后森林环境中的空间行动规划提供信息
DOI：
10.1007/s10980-021-01325-4
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发表时间：
2021
影响因子：
5.2
通讯作者：
Smithwick, Erica A.
中科院分区：
文献类型：
--
作者：
Peeler, Jamie L.;Smithwick, Erica A.
在不同的火灾后森林环境中，景观和当地因素控制着树木的更新。但它们的相对影响尚不清楚——这限制了管理者在分配资源以帮助林分替换补丁成功补充林分时考虑景观背景的程度。目的研究在不同的火灾后森林环境中，景观和局部因素对树木再生的影响。我们的研究问题是：景观因子和局地因子对林分替换斑块树种存在（RQ1）和载畜密度（RQ2）的相对影响是什么？当景观因素有影响时是否会出现阈值（RQ3）？方法对美国怀俄明州杰克逊市附近的71个样地进行景观和局部变量采样。我们使用随机森林来研究当地和景观变量如何影响火灾后树木的恢复。相对影响是用准确度的平均下降来确定的。偏相关图用于显示准确度平均下降15%的变量是否出现阈值。结果种子源面积等景观因子与亚高山冷杉的存在和放养密度有关。但是出现了不同的阈值。具体来说，亚高山冷杉的存在需要10%的种子源面积，而放养密度需要40%。种子源面积约为10%的东北方向最可能支持亚高山冷杉的存在。相反，土壤养分等当地因素与黑松的存在有关，突出了不同更新策略的影响。结论景观因子增强了林分替换斑块的空间恢复力，有助于林分替换斑块的自然恢复。但在不同的火灾后森林环境中，景观因子对树木更新的支持程度并不相同。因此，在景观背景下考虑林分替代斑块将对未来的空间行动规划至关重要。
ContextLandscape and local factors govern tree regeneration across heterogeneous post-fire forest environments. But their relative influence is unclear—limiting the degree that managers can consider landscape context when delegating resources to help stand-replacing patches restock successfully.ObjectivesWe investigated how landscape and local factors shape tree regeneration across heterogeneous post-fire forest environments. Our research questions were: What is the relative influence of landscape and local factors on tree species presence (RQ1) and stocking density (RQ2) at stand-replacing patches? Do thresholds occur when landscape factors are influential (RQ3)?MethodsWe sampled landscape and local variables at 71 plots near Jackson, Wyoming, United States. We used Random Forests to investigate how local and landscape variables affect post-fire tree recovery. Relative influence was determined using mean decrease in accuracy. Partial dependence plots were used to visualize whether thresholds occurred for variables with mean decrease in accuracy > 15%.ResultsLandscape factors like seed source area were associated with subalpine fir presence and stocking density. But different thresholds occurred. Specifically, subalpine fir presence required 10% seed source area, while stocking density required 40%. Northeast aspects surrounded by > 10% seed source area were most likely to support subalpine fir presence. Conversely, local factors like soil nutrients were associated with lodgepole pine presence, highlighting effects of different regeneration strategies.ConclusionsLandscape factors bolster spatial resilience and help stand-replacing patches restock naturally. But landscape factors do not support tree regeneration equally across heterogeneous post-fire forest environments. Consequently, considering stand-replacing patches in their landscape context will be critical for future spatial action planning.
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盛宴而非饥荒：25 年树龄的火灾后黑松中的氮池迅速恢复。
影响因子：
4.8
作者：
M. Turner;T. G. Whitby;W. H. Romme
通讯作者：
W. H. Romme
DOI：
--
发表时间：
1986
期刊：
影响因子：
--
作者：
W. McCaughey;W. Schmidt;R. C. Shearer
通讯作者：
R. C. Shearer
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
J. Perkins
通讯作者：
J. Perkins
影响因子：
2.9
作者：
Ryan B. Walker;Jonathan D. Coop;William M. Downing;Meg A. Krawchuk;Sparkle L. Malone;Garrett W. Meigs
通讯作者：
Garrett W. Meigs
影响因子：
4.8
作者：
Hansen, Winslow D.;Braziunas, Kristin H.;Turner, Monica G.
通讯作者：
Turner, Monica G.