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The Interactive Role of Climatic Transfer Distance and Overstory Retention on Douglas‐Fir Seedling Survival and Height Growth in Interior British Columbia
Global Change Biology ( IF 10.8 ) Pub Date : 2025-01-24 , DOI: 10.1111/gcb.70027
Thomson C. Harris, W. Jean Roach, Erin M. Miller, Suzanne W. Simard

The future climatic niche of interior Douglas‐fir (Pseudotsuga menziesii var. glauca [Mirb.] Franco) is expected to have little spatial overlap with its current range due to climate change. The resulting misalignment of the climatic niche and species distribution is expected to result in many forests becoming maladapted in their current location, thus increasing vulnerability to disturbance and reducing productivity. This novel study examined the individual and interactive effects of climatic transfer distance and silviculture systems on planted 3‐year‐old Douglas‐fir seedlings across the natural range of interior Douglas‐fir in British Columbia. Several climatic transfer distance variables were considered, and the silviculture systems tested comprised the following gradients of tree retention: 0% retention (clearcut), 10% dispersed retention (seed‐tree), 30% aggregate retention, and 60% aggregate retention with thinning from below. Using linear mixed effect models, we found that survival and height were positively correlated with movements of seedlings to warmer, wetter, and more humid climates. Moisture availability had a stronger influence than temperature, indicating that seedlings transferred to warmer but more arid climates would experience decreased survival and height. Where seedlings were transferred to climates with greater frost frequency or decreased humidity, greater retention of overstory trees improved survival and height. Conversely, movements to more favorable climatic conditions (warmer and wetter) resulted in improved survival and height where overstory retention was low. Our findings suggest that genetic reshuffling of populations through assisted migration could benefit from overstory retention where stressful climatic conditions due to aridity or increased frost frequency occur.

中文翻译:


气候转移距离和林上保留对不列颠哥伦比亚省内陆花旗松幼苗存活和高度生长的交互作用



室内花旗松的未来气候生态位 (Pseudotsuga menziesii var. glauca [Mirb.]Franco) 预计与当前分布范围几乎没有空间重叠。由此产生的气候生态位和物种分布的错位预计将导致许多森林在当前位置变得不适应,从而增加对干扰的脆弱性并降低生产力。这项新颖的研究检查了气候转移距离和造林系统对不列颠哥伦比亚省内部花旗松自然范围内种植的 3 年生花旗松幼苗的个体和交互影响。考虑了几个气候转移距离变量,测试的造林系统包括以下树木保留梯度:0% 保留(清除)、10% 分散保留(种子树)、30% 骨料保留和 60% 骨料保留,从下而间伐。使用线性混合效应模型,我们发现存活率和身高与幼苗向更温暖、更潮湿和更潮湿气候的运动呈正相关。水分可用性比温度具有更大的影响,表明转移到温暖但更干旱气候的幼苗会经历存活率和高度下降。当幼苗转移到霜冻频率较高或湿度较低的气候中时,更多地保留林上树木可以提高存活率和高度。相反,向更有利的气候条件(更温暖和更潮湿)的运动导致在林上保留率低的地方提高存活率和高度。 我们的研究结果表明,通过辅助迁移对种群进行遗传重组可能受益于由于干旱或霜冻频率增加而产生的压力气候条件的覆盖层保留。
更新日期:2025-01-24
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