Forests have resistance that allows them to resist fires without changing to another state, and resilience that allows them to recover after disturbance. These properties are determined by many structural and functional determinants that interact between them. Despite the importance of structural resistance and functional resilience to wildland fires, few studies have evaluated the combined effect that structural and functional determinants have on them. Our goal was to assess the structural resistance and functional resilience to fire using remote sensing information. We specifically assessed the combined effect of pre‐fire vegetation characteristics, burn severity, and post‐fire precipitation on forest structural resistance and functional resilience to fire. Eighty‐five forest plots of 250 m × 250 m were selected in areas that burned in 2003. For each burned plot, a paired unburned control plot of 250 m × 250 m was selected outside the burned areas. We measured burn severity and post‐fire precipitations (2004–2011). We analysed MODIS time series in order to calculate the following pre‐ (2002) and post‐fire (2011) phenological parameters: minimum level of photosynthetic activity per year; maximum level of photosynthetic activity per year; length of growing season per year; integral of annual photosynthetic activity; relative seasonality of photosynthetic activity. Also we detected plots that changed into a shrubland eight years after the fire. Fifty three per cent of burned plots changed from forest into a shrubland state. Results show that the forest structural resistance to fire depends on the balance between the level of severity and the parameters related to pre‐fire aboveground net primary production. The impact of pre‐fire vegetation characteristics on functional resilience ability was driven by burn severity and it’s interactions with pre‐fire productivity and seasonality. Results suggest that changes in forest species composition and aboveground net primary production reduced forest structural resistance and functional resilience to fire.

中文翻译：

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Chaco森林对野火的结构抗性和功能弹性：采用MODIS时间序列的方法

森林具有抵抗力，可以抵御火灾而不会改变为另一种状态，而抵御力则可以使其在受到干扰后得以恢复。这些属性由它们之间相互作用的许多结构和功能决定因素决定。尽管结构抗性和功能弹性对野外火灾具有重要意义，但很少有研究评估结构和功能决定因素对它们的综合影响。我们的目标是使用遥感信息评估结构的耐火性和功能弹性。我们专门评估了火灾前植被特征，燃烧严重性和火灾后降水对森林结构抗性和功能抗火性的综合影响。在2003年被烧毁的地区，选择了85个250 m×250 m的森林地块。对于每个燃烧区，在燃烧区外选择一个250 m×250 m的成对未燃烧对照区。我们测量了烧伤的严重程度和火灾后的降水（2004-2011年）。我们分析了MODIS时间序列，以计算以下2002年前和2011火灾后的物候参数：每年光合作用的最低水平；每年最大的光合作用水平；每年的生长期；年度光合作用活动的积分；光合活动的相对季节性。我们还发现了大火八年后变成灌木丛的地块。53％的被烧土地从森林变为灌木丛状。结果表明，森林的结构抗火性取决于严重程度和与火灾前地上净初级生产有关的参数之间的平衡。烧前严重程度及其与烧前生产力和季节性的相互作用驱动了烧前植被特征对功能复原力的影响。结果表明，森林物种组成和地上净初级生产的变化降低了森林的结构抵抗力和防火功能。