Climate Drives Episodic Conifer Establishment after Fire in Dry Ponderosa Pine Forests of the Colorado Front Range, USA
Climate Drives Episodic Conifer Establishment after Fire in Dry Ponderosa Pine Forests of the Colorado Front Range, USA
复制标题
气候驱动美国科罗拉多州前沿山脉干燥黄松林火灾后针叶树的生长
作者：
Monica T. Rother;T. Veblen
近年来，气候变暖和火灾活动增加引起了人们对美国西部森林火灾后恢复的关注。我们评估了气候变化和树木建立后，在干黄松森林的科罗拉多前线范围火灾之间的关系。我们收获和年龄超过400火灾后的少年黄松（美国黄松）和花旗松（黄杉）树使用改进的树轮为基础的方法，产生每年解决的日期，然后评估气候变化和脉冲树建立之间的关系。我们发现，树木的建立主要集中在年以上的平均水分供应在生长季节，包括更高的降水量和更积极的帕尔默干旱严重程度指数的值。在气候持续变化的情况下，与气温升高相关的干燥条件可能会限制火灾后的森林恢复，这可能导致林分密度降低或在某些地区转向非森林植被。
In recent years, warming climate and increased fire activity have raised concern about post-fire recovery of western U.S. forests. We assessed relationships between climate variability and tree establishment after fire in dry ponderosa pine forests of the Colorado Front Range. We harvested and aged over 400 post-fire juvenile ponderosa pine (Pinus ponderosa) and Douglas-fir (Pseudotsuga menziesii) trees using an improved tree-ring based approach that yielded annually-resolved dates and then assessed relationships between climate variability and pulses of tree establishment. We found that tree establishment was largely concentrated in years of above-average moisture availability in the growing season, including higher amounts of precipitation and more positive values of the Palmer Drought Severity Index. Under continued climate change, drier conditions associated with warming temperatures may limit forest recovery after fire, which could result in lower stand densities or shifts to non-forested vegetation in some areas.