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首页> 外文期刊>Annals of Forest Science >Optimising the management of Pinus sylvestris L. stand under risk of fire in Catalonia (north-east of Spain)
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Optimising the management of Pinus sylvestris L. stand under risk of fire in Catalonia (north-east of Spain)

机译：优化加泰罗尼亚（西班牙东北部）遭受火灾危险的樟子松林的管理

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The paper introduces the risk of fire as part of a stand management optimisation problem for even-aged Pinus sylvestris L. stands in Spain. The study used a simulation-optimisation system, SPINE, to examine the effect of risk of fire on the optimal stand management schedule when maximising soil expectation value (SEV). The simulation sub-system includes a deterministic stand growth and yield simulator based on individual-tree growth and mortality models. The simulator was modified to include stochastic fire occurrence. The simulation subsystem was combined with a non-linear optimisation algorithm to find the optimal management schedule. Five different fire probabilities were analysed (0, 0.5,1, 2 and 5% five-year fire probabilities). In most calculations, the probability of fire was assumed to be constant over the whole rotation, but an analysis was also conducted in which the probability depended on management and the stage of stand development. The results were computed for discounting rates of 1, 2 and 3%, site indexes of 17, 24 and 30 m (dominant height at 100 years), and 0 to 3 thinnings. The effects of reforestation cost, salvage possibility and regeneration lag were also studied. Increased fire probability caused 15 to 35 years reductions in the optimal rotation length, and also decreased soil expectation value. The effect of fire risk on the timing and intensity of thinnings was less systematic when a constant fire risk was assumed. When fire risk depended on stand structure, increased risk level led to earlier and heavier low thinnings.
机译：本文介绍了火灾风险，这是西班牙平龄樟子松林分林展位管理优化问题的一部分。该研究使用了模拟优化系统SPINE，以在最大化土壤期望值（SEV）时检查火灾风险对最佳林分管理计划的影响。模拟子系统包括基于个体树木生长和死亡率模型的确定性林分生长和产量模拟器。对模拟器进行了修改，以包括随机火灾。模拟子系统与非线性优化算法结合在一起，以找到最佳的管理计划。分析了五种不同的火灾概率（五年火灾概率分别为0、0.5、1、2和5％）。在大多数计算中，假定发生火灾的概率在整个旋转过程中是恒定的，但还进行了分析，其中该概率取决于管理和林分发展阶段。计算得出的折现率为1％，2％和3％，站点指数为17、24和30 m（100年时的主要高度）以及0到3个间伐。还研究了造林成本，打捞可能性和再生滞后的影响。发生火灾的可能性增加，导致最佳旋转长度减少15至35年，并且土壤期望值也降低。当假定恒定的火灾风险时，火灾风险对间伐时间和强度的影响不太系统。当火灾风险取决于林分结构时，增加的风险水平导致较早的稀疏和较重的稀疏。

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