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首页> 外文期刊>Forestry >Invasive forest defoliator contributes to the impending downward trend of oak dominance in eastern North America
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Invasive forest defoliator contributes to the impending downward trend of oak dominance in eastern North America

机译：入侵性森林落叶者推动了北美东部即将到来的橡树优势下降趋势

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摘要

Disturbance by non-native insect species can be an important ecological driver shaping Long-term changes in vegetation and plant species composition. While impacts of gypsy moth (Lymatria dispar L.) outbreaks in North American forests have been extensively studied, the results are quite inconsistent, particularly with respect to the amount of tree mortality associated with defoliation. In this study, we integrate geographical data describing historical gypsy moth defoliation with forest inventory data collected by a national forest inventory programme to quantify regional impacts across several million hectares of forest Land in the northeastern US. While observed increases in host tree mortality rates and decreases in growth rates associated with defoliation were expected, the study also indicates that this overstory mortality, coupled with ongoing declines in oak regeneration, will result in a Long-term reduction of oak density in defoliated areas. Eventually, these impacts will Likely contribute to regional shifts in tree species composition and forest succession pathways. Gypsy moth outbreaks thus appear to exacerbate ongoing declines in young oak age dosses in the region.
机译：非本地昆虫物种的干扰可能是塑造植被和植物物种组成的长期变化的重要生态驱动力。虽然已经广泛研究了吉普赛蛾（Lymatria dispar L.）爆发在北美森林中的影响，但结果还是不一致的，特别是在与落叶相关的树木死亡率方面。在这项研究中，我们将描述历史性吉普赛蛾落叶的地理数据与国家森林清查计划收集的森林清查数据相结合，以量化美国东北部几百万公顷林地的区域影响。虽然预计观察到的寄主树死亡率增加和与落叶相关的增长率降低，但研究还表明，这种过高的死亡率，以及橡木再生的持续下降，将导致落叶地区的橡木密度长期降低。最终，这些影响将可能有助于树种组成和森林演替途径的区域性转变。因此，吉普赛蛾的爆发似乎加剧了该地区年轻橡树龄剂量的持续下降。

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