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How do trees survive a cyclone? The relative role of individual and site characteristics over mortality
Austral Ecology ( IF 1.5 ) Pub Date : 2021-07-22 , DOI: 10.1111/aec.13088
Dieter Liebsch 1 , Vinicius Marcilio‐Silva 1 , Amanda K. Marcon 1 , Franklin Galvão 2 , Sandra Bos Mikich 3 , Marcia Cristina Mendes Marques 1
Affiliation  

Cyclones are an increasing disturbance in the subtropical region of South America, but their impacts over the forests are still poorly documented. Here, we evaluate the effects of an extratropical cyclone over tree mortality in Araucaria Forest remnants in southern Brazil. We surveyed 116 sites (10 × 20 m each) and collected data on all tree individuals presenting DBH ≥ 4.8 cm before (2009) and after (2014) the occurrence of an extratropical cyclone. Using GLM models, we checked how the cyclone occurrence, different plant traits (DBH, trunk branching, wood density, successional group and evolutionary distinctiveness) and site characteristics (basal area, exposure, landscape protection, nearest border distance, cyclone border distance and the presence of native bamboo species) could impact tree mortality. The GLM model selection shows that the lowest AIC model considers all predictors separately and their interaction with the cyclone. The results showed that the cyclone occurrence and some site characteristics (bamboo presence, site exposure, landscape protection, nearest border distance and cyclone border distance) and plant traits (successional group and evolutionary distinctiveness) are related to tree mortality. The intense deforestation and fragmentation of the Araucaria Forest coupled with the increase in cyclone frequency expected for the region due to climate change may increase mortality rates of these forests, affecting their resilience and phylogenetic structure. Further biodiversity conservation efforts in the Araucaria Forest need to consider the characteristics of sites for enabling the protection of forest remnants in areas under different exposures to cyclone impacts.

中文翻译:

树木如何在飓风中幸存下来?个体和地点特征对死亡率的相对作用

气旋对南美洲亚热带地区的干扰越来越大,但它们对森林的影响仍然鲜有记载。在这里,我们评估了温带气旋对巴西南部南洋杉森林残余物中树木死亡率的影响。我们调查了 116 个地点(每个地点 10 × 20 m),并收集了所有在温带气旋发生之前(2009 年)和之后(2014 年)DBH ≥ 4.8 cm 的树木个体的数据。使用 GLM 模型,我们检查了气旋发生、不同植物性状(胸径、树干分枝、木材密度、演替群和进化独特性)和场地特征(基底面积、暴露、景观保护、最近边界距离、气旋边界距离和本地竹种的存在)可能会影响树木的死亡率。GLM 模型选择表明,最低的 AIC 模型分别考虑所有预测因子及其与气旋的相互作用。结果表明,气旋发生和一些立地特征(竹林存在、立地暴露、景观保护、最近边界距离和气旋边界距离)和植物性状(连续群落和进化独特性)与树木死亡率有关。南洋杉森林的严重森林砍伐和破碎化,再加上气候变化导致该地区的气旋频率增加,可能会增加这些森林的死亡率,影响它们的恢复力和系统发育结构。
更新日期:2021-07-22
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