气候变化领域集成服务门户(CCPortal): Light, temperature and understorey cover predominantly affect early life stages of tree seedlings in a multifactorial mesocosm experiment

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DOI	10.1016/j.foreco.2020.117907
	Light, temperature and understorey cover predominantly affect early life stages of tree seedlings in a multifactorial mesocosm experiment
	De Lombaerde E.; Blondeel H.; Baeten L.; Landuyt D.; Perring M.P.; Depauw L.; Maes S.L.; Wang B.; Verheyen K.
发表日期	2020
ISSN	0378-1127
卷号	461
英文摘要	Increasing light availability by opening up the forest canopy is a key tool for forest managers to stimulate natural regeneration of trees. Tree seedlings are also impacted by a complex set of global change drivers and understorey vegetation. Here, we investigated if (altered) environmental resources and conditions due to global change, and understorey vegetation modulate tree seedling responses, i.e. emergence, survival, growth and biomass allocation, to enhanced light availability. Seeds and seedlings of three species (Quercus robur, Fagus sylvatica and Acer pseudoplatanus) were planted in a multifactorial experiment. Understorey communities were grown in 384 mesocosms on soils from ancient and post-agricultural forest, forested before 1850 and after 1950, respectively. The mesocosms were exposed to two-level full-factorial treatments of light addition, warming and nitrogen enrichment. We measured understorey vegetation cover and height, scored tree seedling emergence and seed predation, measured seedling survival during two growing seasons and measured growth after two growing seasons. We found that emergence and early survival formed critical bottlenecks for seedling establishment. Seed predation formed a barrier to emergence, while cover of understorey vegetation reduced seedling survival. The life stages of the three species were varyingly affected by the different treatments, but predominantly by light addition and warming in a positive way. We found few significant interactions between light and the other treatments, presenting limited evidence of the other drivers modulating seedling responses to increased light availability. With our experiment, we were able to further disentangle the confounding effects of light availability and warming on seedling performance. Our results confirm that managers likely facilitate tree regeneration when opening the canopy by increasing both light availability and temperature, even by slight amounts, at the forest floor. However, managers need to be aware of unintended consequences of their actions as too great an increase in understorey vegetation cover may be detrimental to seedling establishment. © 2020 Elsevier B.V.
关键词	Climate change Land use Managers Vegetation Herb layer Mesocosms Nitrogen additions Open top chambers Tree recruitments Reforestation biomass allocation climate change deciduous forest developmental stage forest canopy herb light availability light effect mesocosm nitrogen open-top chamber regeneration seedling temperature effect understory Coverings Land Use Light Plants Reforestation Survival Trees Acer pseudoplatanus Fagus sylvatica Quercus robur
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132966
推荐引用方式 GB/T 7714	De Lombaerde E.,Blondeel H.,Baeten L.,et al. Light, temperature and understorey cover predominantly affect early life stages of tree seedlings in a multifactorial mesocosm experiment[J]. Forest Ecology and Management,2020,461.
APA	De Lombaerde E..,Blondeel H..,Baeten L..,Landuyt D..,Perring M.P..,...&Verheyen K..(2020).Light, temperature and understorey cover predominantly affect early life stages of tree seedlings in a multifactorial mesocosm experiment.,461.
MLA	De Lombaerde E.,et al."Light, temperature and understorey cover predominantly affect early life stages of tree seedlings in a multifactorial mesocosm experiment".461(2020).