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Drivers of above‐ground understorey biomass and nutrient stocks in temperate deciduous forests
Journal of Ecology ( IF 5.3 ) Pub Date : 2019-12-11 , DOI: 10.1111/1365-2745.13318 Dries Landuyt 1 , Sybryn L. Maes 1 , Leen Depauw 1 , Evy Ampoorter 1 , Haben Blondeel 1 , Michael P. Perring 1, 2 , Guntis Brūmelis 3 , Jörg Brunet 4 , Guillaume Decocq 5 , Jan Ouden 6 , Werner Härdtle 7 , Radim Hédl 8, 9 , Thilo Heinken 10 , Steffi Heinrichs 11 , Bogdan Jaroszewicz 12 , Keith J. Kirby 13 , Martin Kopecký 14, 15 , František Máliš 16, 17 , Monika Wulf 18 , Kris Verheyen 1
中文翻译：
温带落叶林地上地下生物量和养分储量的驱动因素
更新日期：2019-12-11
Journal of Ecology ( IF 5.3 ) Pub Date : 2019-12-11 , DOI: 10.1111/1365-2745.13318 Dries Landuyt 1 , Sybryn L. Maes 1 , Leen Depauw 1 , Evy Ampoorter 1 , Haben Blondeel 1 , Michael P. Perring 1, 2 , Guntis Brūmelis 3 , Jörg Brunet 4 , Guillaume Decocq 5 , Jan Ouden 6 , Werner Härdtle 7 , Radim Hédl 8, 9 , Thilo Heinken 10 , Steffi Heinrichs 11 , Bogdan Jaroszewicz 12 , Keith J. Kirby 13 , Martin Kopecký 14, 15 , František Máliš 16, 17 , Monika Wulf 18 , Kris Verheyen 1
Affiliation
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- The understorey in temperate forests can play an important functional role, depending on its biomass and functional characteristics. While it is known that local soil and stand characteristics largely determine the biomass of the understorey, less is known about the role of global change. Global change can directly affect understorey biomass, but also indirectly by modifying the overstorey, local resource availability and growing conditions at the forest floor.
- In this observational study across Europe, we aim at disentangling the impact of global‐change drivers on understorey biomass and nutrient stocks, from the impact of overstorey characteristics and local site conditions. Using piecewise structural equation modelling, we determine the main drivers of understorey biomass and nutrient stocks in these forests and examine potential direct and indirect effects of global‐change drivers.
- Tree cover, tree litter quality and differences in former land use were the main drivers of understorey biomass and nutrient stocks, via their influence on understorey light and nitrogen availability and soil acidity. Other global‐change drivers, including climate and nitrogen deposition, had similar indirect effects, but these were either weak or only affecting nutrient concentrations, not stocks.
- Synthesis. We found that direct effects of global‐change drivers on understorey biomass and nutrient stocks were absent. The indirect effects of global change, through influencing resource availability and growing conditions at the forest floor, were found to be less important than the effects of overstorey cover and composition. These results suggest that understorey biomass and nutrient stocks might respond less to global change in the presence of a dense overstorey, highlighting the buffering role of the overstorey in temperate forests.
中文翻译：
温带落叶林地上地下生物量和养分储量的驱动因素
- 温带森林中的林下层可以发挥重要的功能作用，这取决于其生物量和功能特征。众所周知，当地土壤和林分的特征在很大程度上决定了底层生物量，但对全球变化的作用知之甚少。全球变化可以直接影响林下生物量，但也可以通过修改林下层，当地资源的可利用性和生长条件而间接影响。
- 在整个欧洲的这项观察性研究中，我们旨在区分全球变化驱动因素对低层生物量和养分储量的影响，以及高层特征和当地环境的影响。使用分段结构方程模型，我们确定了这些森林下层生物量和养分储量的主要驱动因素，并研究了全球变化驱动因素的潜在直接和间接影响。
- 树木覆盖物，树木凋落物的质量以及以前土地用途的差异是影响地下层生物量和养分储量的主要驱动力，因为它们对地下层光，氮的有效性和土壤酸度有影响。其他全球变化驱动因素，包括气候和氮沉降，也具有类似的间接影响，但这些影响微弱或仅影响营养物浓度，而不影响种群。
- 合成。我们发现，缺乏全球变化驱动因素对底层生物量和养分储量的直接影响。人们发现，通过影响森林地表资源的可获得性和生长条件，全球变化的间接影响不如覆盖层和覆盖物的影响重要。这些结果表明，在存在密集的过度层的情况下，不足层的生物量和养分储量对全球变化的响应可能较小，突出了过度层在温带森林中的缓冲作用。
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