and are the most widespread invasive trees in Central Europe. In addition, according to climate models, decreased growth of many economically and ecologically important native trees will likely be observed in the future. We aimed to assess the impact of these two neophytes, which differ in the biomass range and nitrogen-fixing abilities observed in Central European conditions, on the relative aboveground biomass increments of native oaks and and Scots pine . We aimed to increase our understanding of the relationship between facilitation and competition between woody alien species and overstory native trees. We established 72 circular plots (0.05 ​ha) in two different forest habitat types and stands varying in age in western Poland. We chose plots with different abundances of the studied neophytes to determine how effects scaled along the quantitative invasion gradient. Furthermore, we collected growth cores of the studied native species, and we calculated aboveground biomass increments at the tree and stand levels. Then, we used generalized linear mixed-effects models to assess the impact of invasive species abundances on relative aboveground biomass increments of native tree species. We did not find a biologically or statistically significant impact of invasive or on the relative aboveground biomass increments of native oaks and pines along the quantitative gradient of invader biomass or on the proportion of total stand biomass accounted for by invaders. The neophytes did not act as native tree growth stimulators but also did not compete with them for resources, which would escalate the negative impact of climate change on pines and oaks. The neophytes should not significantly modify the carbon sequestration capacity of the native species. Our work combines elements of the effect of invasion with research on mixed forest management.

中文翻译：

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入侵树种对温带森林橡树和松树地上生物量增量没有影响


是中欧最广泛的入侵树木。此外，根据气候模型，未来可能会观察到许多具有经济和生态重要性的本土树木的生长减少。我们的目的是评估这两种新植物对本地橡树和欧洲赤松相对地上生物量增量的影响，它们在中欧条件下观察到的生物量范围和固氮能力不同。我们的目的是加深对木本外来物种与林间原生树木之间的促进与竞争关系的理解。我们在波兰西部两种不同的森林栖息地类型和不同年龄的森林中建立了 72 个圆形地块（0.05 公顷）。我们选择了所研究的新手丰度不同的地块，以确定效应如何沿着定量入侵梯度缩放。此外，我们收集了所研究的本地物种的生长核心，并计算了树木和林分水平的地上生物量增量。然后，我们使用广义线性混合效应模型来评估入侵物种丰度对本地树种相对地上生物量增量的影响。我们没有发现入侵物对本地橡树和松树的相对地上生物量增量（沿入侵者生物量的数量梯度）或入侵者占总林分生物量的比例产生生物学或统计学上的显着影响。这些新手并没有起到本地树木生长刺激剂的作用，也没有与它们竞争资源，这会加剧气候变化对松树和橡树的负面影响。新手不应显着改变本地物种的碳封存能力。 我们的工作将入侵影响的要素与混交林管理的研究结合起来。