Spatial patterns of unburned refugia in Siberian larch forests during the exceptional 2020 fire season
Spatial patterns of unburned refugia in Siberian larch forests during the exceptional 2020 fire season
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2020 年特殊火灾季节西伯利亚落叶松森林未燃烧保护区的空间格局
DOI：
10.1111/geb.13529
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发表时间：
2022
影响因子：
6.4
通讯作者：
Alexander, Heather D.
中科院分区：
文献类型：
--
作者：
Talucci, Anna C.;Loranty, Michael M.;Alexander, Heather D.
野火是一种必不可少的干扰因素，它会在整个景观中产生燃烧马赛克，或燃烧和未燃烧区域的拼凑。未燃烧的斑块，火灾避难所，作为碳汇和森林再生的种子来源在烧毁的地区。在Cajander落叶松（Larix cajanderiMayr.）西伯利亚东北部的森林，2020年前所未有的野火季节以及景观斑块动态的很少文献导致了对北方纬度森林火灾避难所特征的研究空白，这些森林比其他全球森林生态系统变暖得更快。我们的目标是表征2010年分布的火灾避难所为这些森林生态系统和评估其地形drivers.LocationNorth‐eastern西伯利亚东北部西伯利亚东北针叶林和Cherskii-Kolyma山苔原ecozones.Time period 2001 -2020.Major taxa studiedCajander larch.MethodsWe使用Landsat图像来定义烧毁和未烧毁的补丁，和北极数字高程模型来计算地形变量。我们描述了火灾避难所的大小和密度。我们从一个图像堆栈中采样了单个像素（n= 80，000），该图像堆栈包括2001年至2020年的二进制燃烧/未燃烧，海拔，坡度，方面，地形位置指数，崎岖度和树木覆盖。我们评估了地形的消防避难所的驱动程序与提升回归trees.ResultsWe发现没有实质性的差异，在整个地区的消防避难所的大小和密度。火灾避难所的面积平均为7.2公顷（0.09- 150，439公顷）。绝大多数内部火烧斑超过了火灾避难所的潜在风扩散距离。地形位置指数和地形陡度是火灾避难所的重要预测因子。主要结论2020年前所未有的野火没有影响火灾避难所的形成。火灾避难所强烈控制的地形位置，如高地和低地，影响微型水文条件。火灾避难所有助于火灾后景观异质性，保护生态系统功能，种子来源，栖息地和碳汇。
AimWildfire is an essential disturbance agent that creates burn mosaics, or a patchwork of burned and unburned areas across the landscape. Unburned patches, fire refugia, serve as carbon sinks and seed sources for forest regeneration in burned areas. In the Cajander larch (Larix cajanderiMayr.) forests of north‐eastern Siberia, an unprecedented wildfire season in 2020 and little documentation of landscape patch dynamics have resulted in research gaps about the characteristics of fire refugia in northern latitude forests, which are warming faster than other global forest ecosystems. We aim to characterize the 2010 distribution of fire refugia for these forest ecosystems and evaluate their topographic drivers.LocationNorth‐eastern Siberia across the North‐east Siberian Taiga and the Cherskii‐Kolyma Mountain Tundra ecozones.Time period2001–2020.Major taxa studiedCajander larch.MethodsWe used Landsat imagery to define burned and unburned patches, and the Arctic digital elevation model to calculate topographic variables. We characterized the size and density of fire refugia. We sampled individual pixels (n= 80,000) from an image stack that included a binary burned/unburned, elevation, slope, aspect, topographic position index, ruggedness, and tree cover from 2001 to 2020. We evaluated the topographic drivers of fire refugia with boosted regression trees.ResultsWe found no substantial difference in fire refugia size and density across the region. The fire refugia size averaged 7.2 ha (0.09–150,439 ha). The majority of interior burned patches exceed the potential wind dispersal distance from fire refugia. Topographic position index and terrain steepness were important predictors of fire refugia.Main conclusionsUnprecedented wildfires in 2020 did not impact fire refugia formation. Fire refugia are strongly controlled by topographic positions such as uplands and lowlands that influence microsite hydrological conditions. Fire refugia contribute to postfire landscape heterogeneity that preserves ecosystem functions, seed sources, habitat, and carbon sinks.
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影响因子：
6.7
作者：
M. Loranty;W. Lieberman-Cribbin;L. Berner;S. Natali;S. Goetz;H. Alexander;A. Kholodov
通讯作者：
M. Loranty;W. Lieberman-Cribbin;L. Berner;S. Natali;S. Goetz;H. Alexander;A. Kholodov
影响因子：
3.7
作者：
M. Turner;V. Dale
通讯作者：
M. Turner;V. Dale
使用无人机导出的植被指数评估西伯利亚东北部卡尚德落叶松森林火灾后植被恢复情况
影响因子：
5
作者：
Talucci, Anna C.;Forbath, Elena;Kropp, Heather;Alexander, Heather D.;DeMarco, Jennie;Paulson, Alison K.;Zimov, Nikita S.;Zimov, Sergei;Loranty, Michael M.
通讯作者：
Loranty, Michael M.
DOI：
--
发表时间：
1987
期刊：
影响因子：
--
作者：
Kevin E. Eberhart;P. Woodard
通讯作者：
P. Woodard
艾伯塔省北方平原冬季有蹄类动物浏览演替的动态模式
影响因子：
3.7
作者：
Mélanie R. Routh;S. Nielsen
通讯作者：
S. Nielsen