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首页> 美国卫生研究院文献>Ecology and Evolution >Postfire soil water repellency in piñon–juniper woodlands: Extent severity and thickness relative to ecological site characteristics and climate
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Postfire soil water repellency in piñon–juniper woodlands: Extent severity and thickness relative to ecological site characteristics and climate

机译：Piñon-Juniper林地火灾后的拒水性：相对于生态场所特征和气候的范围严重程度和厚度

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Wildfires can create or intensify water repellency in soil, limiting the soil's capacity to wet and retain water. The objective of this research was to quantify soil water repellency characteristics within burned piñon–juniper woodlands and relate this information to ecological site characteristics. We sampled soil water repellency across forty‐one 1,000 m2 study plots within three major wildfires that burned in piñon–juniper woodlands. Water repellency was found to be extensive—present at 37% of the total points sampled—and strongly related to piñon–juniper canopy cover. Models developed for predicting SWR extent and severity had R 2 adj values of 0.67 and 0.61, respectively; both models included piñon–juniper canopy cover and relative humidity the month before the fire as coefficient terms. These results are important as they suggest that postfire water repellency will increase in the coming years as infilling processes enhance piñon–juniper canopy cover. Furthermore, reductions in relative humidity brought about by a changing climate have the potential to link additively with infilling processes to increase the frequency and intensity of wildfires and produce stronger water repellency over a greater spatial extent. In working through these challenges, land managers can apply the predictive models developed in this study to prioritize fuel control and postfire restoration treatments.
机译：野火会在土壤中产生或增强疏水性，从而限制了土壤润湿和保留水分的能力。这项研究的目的是量化燃烧的松树-松柏林地内的土壤憎水特性，并将这些信息与生态场所特征联系起来。我们在piñon-Juniper林地中燃烧的三场主要野火中对41个1,000 m 2 研究区的土壤疏水性进行了采样。拒水性广泛，占采样总点数的37％，并且与松树-杜松树冠层密切相关。用于预测SWR程度和严重性的模型的R 2 调整值分别为0.67和0.61。两种模型都包含火树松柏冠层覆盖率和火灾发生前一个月的相对湿度（以系数表示）。这些结果很重要，因为它们表明，随着灌装过程增强松树-杜松树冠层的覆盖度，在未来几年中，防火后的拒水性将会提高。此外，由于气候变化而导致的相对湿度降低有可能与填充过程相联系，从而增加野火的频率和强度，并在更大的空间范围内产生更强的拒水性。在应对这些挑战时，土地管理人员可以应用本研究中开发的预测模型来确定燃料控制和火灾后恢复处理的优先次序。

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