Fire return intervals explain different vegetation cover responses to wildfire restoration in two Sierra Nevada basins
Fire return intervals explain different vegetation cover responses to wildfire restoration in two Sierra Nevada basins
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DOI：
10.1016/j.foreco.2022.120429
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发表时间：
2022-10
影响因子：
3.7
通讯作者：
O. Crompton;G. Boisramé;E. Rakhmatulina;S. Stephens;S. Thompson
中科院分区：
文献类型：
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作者：
O. Crompton;G. Boisramé;E. Rakhmatulina;S. Stephens;S. Thompson
使用简单的动力学模型来探索加利福尼亚州内华达山脉两个盆地的森林覆盖动态，即优胜美地国家公园的伊利卢埃特溪盆地 (ICB) 和红杉-国王峡谷国家公园的舒格洛夫溪盆地 (SCB)。自 20 世纪 70 年代以来，经过近一个世纪的排除和扑火之后，这些盆地的火灾管理一直试图恢复接近自然的火灾状态。该模型描述了两个树冠层，代表混合针叶树和灌木为主的土地覆盖类型，并使用土地覆盖图和来自 ICB 的火灾复发和严重程度数据进行校准。校准模型用于探索与 ICB 中火灾严重程度和返回间隔增加相关的几种场景，并探索 ICB 和 SCB 之间的差异。结果表明，(i) 2012 年的 ICB 尚未达到稳定状态的森林覆盖率，(ii) 未来火灾严重程度和频率的潜在变化将导致森林覆盖率减少，(iii) 流域之间因火灾状况恢复而导致的森林覆盖率变化的差异可以通过火灾历史的差异来解释。
A simple dynamical model was used to explore the forest cover dynamics for two basins in the Sierra Nevada of California, Illilouette Creek Basin (ICB) in Yosemite National Park and Sugarloaf Creek Basin (SCB) in Sequoia-Kings Canyon National Park. Since the 1970s, fire management in these basins has attempted to restore a near-natural fire regime, after nearly a century of fire exclusion and suppression. The model describes two canopy layers, representing mixed conifer and shrub-dominated landcover types, and is calibrated using landcover maps and fire recurrence and severity data from the ICB. The calibrated model is used to explore several scenarios pertaining to increasing fire severity and return interval in the ICB, and to explore the differences between the ICB and SCB. The results indicate that (i) the ICB in 2012 had not yet reached steady state forest cover, (ii) potential future changes in fire severity and frequency will yield reductions in forest cover, and (iii) differences in forest cover change in response to fire regime restoration between basins can be explained by differences in fire histories.