Spatially explicit and stochastic forest landscape model of fire disturbance and succession
Spatially explicit and stochastic forest landscape model of fire disturbance and succession
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发表时间：
2005
影响因子：
0.6
通讯作者：
Jian Yang
中科院分区：
文献类型：
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作者：
Jian Yang
火灾扰动在塑造许多森林景观的生态系统动态和植被格局方面发挥着重要作用。本论文致力于空间显性随机森林景观模型，特别是LANDIS模型中的火灾扰动建模。提出了分层火灾频率模型来模拟火灾发生。 LANDIS 中实施了四种具有代表性的火灾蔓延模拟方法。我比较了在不依赖燃料和依赖燃料的两种火灾发生过程场景下使用四种火灾蔓延模拟方法模拟的火灾模式。结果表明，将燃料纳入火灾发生模型极大地改变了模拟火灾模式。最后，我使用点过程建模方法研究了人类和其他因素对密苏里州奥扎克高地火灾发生概率的影响。火灾发生密度的空间分布是点模式建模的结果之一，可以进一步在LANDIS中用作模拟火灾发生的输入图。
Fire disturbance plays an important role in shaping ecosystem dynamics and vegetation patterns in many forested landscapes. This dissertation is dedicated to the modeling of fire disturbance in spatially explicit and stochastic forest landscape models, in particular, LANDIS model. A hierarchical fire frequency model was proposed to model fire occurrence. Four representative fire spread simulation methods were implemented in LANDIS. I compared fire patterns simulated using the four fire spread simulation methods under two fire occurrence process scenarios that are fuel-independent and fuel-dependent. Results showed that the incorporation of fuel into fire occurrence modeling greatly changes simulated fire patterns. Lastly, I used point process modeling approach to study the effects humans and other factors on the probability of fire occurrence in the Missouri Ozark Highlands. The spatial distribution of fire occurrence density, which is one of the results from point pattern modeling, can be further used in LANDIS as an input map for simulating fire occurrence.