Relating fuel loads to overstorey structure and composition in a fire-excluded Sierra Nevada mixed conifer forest.
Relating fuel loads to overstorey structure and composition in a fire-excluded Sierra Nevada mixed conifer forest.
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将燃料负荷与排除火灾的内华达山脉混合针叶林中的上层结构和成分联系起来。
DOI：
10.1071/wf13066
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发表时间：
2015
影响因子：
3.1
通讯作者：
S. Stephens
中科院分区：
文献类型：
--
作者：
J. Lydersen;B. Collins;E. Knapp;Gary B. Roller;S. Stephens
虽然了解地面燃料负荷对于评估潜在火灾行为和影响至关重要，但其固有的可变性使其难以量化。有几项研究将燃料负荷与植被类型、地形和光谱成像联系起来，但在小规模（<0.05公顷）上研究森林覆盖变量与地表燃料特性之间关系的工作很少。结构和成分的内部差异预计会影响燃料床的特性，从而影响火灾行为和效果。我们使用了密集的树木和燃料的测量，在火灾排除塞拉利昂内华达州针叶混交林，以评估关系，并建立预测模型的负载的达夫，凋落物和四个大小类的倒下的木质燃料overstorey结构和组成。上层变量解释了燃油负荷变化的一个显着但有点小的百分比，预测模型的边缘R2值范围从0.16到0.29。林冠覆盖是所有燃料成分的一个相对重要的预测因素，尽管关系因树种而异。白色冷杉的丰富度与总细木质可燃物负荷呈正相关。更大的松树丰度与较低的负荷细木质燃料和更大的负荷凋落物。Duff负载与总断面积呈正相关，与橡树丰度呈负相关。知识的关系，有助于站内的变化，燃料负载可以增加我们的理解，燃料积累，提高我们的能力，以预期细尺度的变化，在火灾行为和影响，在异质混合物种的立场。
Although knowledge of surface fuel loads is critical for evaluating potential fire behaviour and effects, their inherent variability makes these difficult to quantify. Several studies relate fuel loads to vegetation type, topography and spectral imaging, but little work has been done examining relationships between forest overstorey variables and surface fuel characteristics on a small scale (<0.05 ha). Within-stand differences in structure and composition would be expected to influence fuel bed characteristics, and thus affect fire behaviour and effects. We used intensive tree and fuel measurements in a fire-excluded Sierra Nevada mixed conifer forest to assess relationships and build predictive models for loads of duff, litter and four size classes of downed woody fuels to overstorey structure and composition. Overstorey variables explained a significant but somewhat small percentage of variation in fuel load, with marginal R2 values for predictive models ranging from 0.16 to 0.29. Canopy cover was a relatively important predictor for all fuel components, although relationships varied with tree species. White fir abundance had a positive relationship with total fine woody fuel load. Greater pine abundance was associated with lower load of fine woody fuels and greater load of litter. Duff load was positively associated with total basal area and negatively associated with oak abundance. Knowledge of relationships contributing to within-stand variation in fuel loads can increase our understanding of fuel accumulation and improve our ability to anticipate fine-scale variability in fire behaviour and effects in heterogeneous mixed species stands.
影响因子：
6.6
作者：
Nakagawa, Shinichi;Schielzeth, Holger
通讯作者：
Schielzeth, Holger