Climatic conditions, not above- and belowground resource availability and uptake capacity, mediate tree diversity effects on productivity and stability
2022
Jing, Xin | Muys, Bart | Baeten, Lander | Bruelheide, Helge | de Wandeler, Hans | Desie, Ellen | Hättenschwiler, Stephan | Jactel, Hervé | Jaroszewicz, Bogdan | Jucker, Tommaso | Kardol, Paul | Pollastrini, Martina | Ratcliffe, Sophia | Scherer-Lorenzen, Michael | Selvi, Federico | Vancampenhout, Karen | van Der Plas, Fons | Verheyen, Kris | Vesterdal, Lars | Zuo, Juan | van Meerbeek, Koenraad | Department of Earth and Environmental Sciences [Leuven-Heverlee] ; Catholic University of Leuven = Katholieke Universiteit Leuven (KU Leuven) | Universiteit Gent = Ghent University = Université de Gand (UGENT) | Martin-Luther-Universität Halle Wittenberg - Martin-Luther-University Halle Wittenberg (MLU) | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM) | Biodiversité, Gènes & Communautés (BioGeCo) ; Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Uniwersytet Warszawski [Polska] = University of Warsaw [Poland] = Université de Varsovie [Pologne] (UW) | University of Bristol [Bristol] | Department of Forest Ecology and Management ; Swedish University of Agricultural Sciences = Sveriges lantbruksuniversitet (SLU) | Università degli Studi di Firenze = University of Florence = Université de Florence (UniFI) | National Biodiversity Network (NBN) | Albert-Ludwigs-Universität Freiburg = University of Freiburg | Leipzig University / Universität Leipzig | Wageningen University and Research [Wageningen] (WUR) | University of Copenhagen = Københavns Universitet (UCPH)
International audience
显示更多 [+] 显示较少 [-]英语. Tree species diversity promotes multiple ecosystem functions and services. However, little is known about how above- and belowground resource availability (light, nutrients, and water) and resource uptake capacity mediate tree species diversity effects on aboveground wood productivity and temporal stability of productivity in European forests and whether the effects differ between humid and arid regions. We used the data from six major European forest types along a latitudinal gradient to address those two questions. We found that neither leaf area index (a proxy for light uptake capacity), nor fine root biomass (a proxy for soil nutrient and water uptake capacity) was related to tree species richness. Leaf area index did, however, enhance productivity, but negatively affected stability. Productivity was further promoted by soil nutrient availability, while stability was enhanced by fine root biomass. We only found a positive effect of tree species richness on productivity in arid regions and a positive effect on stability in humid regions. This indicates a possible disconnection between productivity and stability regarding tree species richness effects. In other words, the mechanisms that drive the positive effects of tree species richness on productivity do not per se benefit stability simultaneously. Our findings therefore suggest that tree species richness effects are largely mediated by differences in climatic conditions rather than by differences in above- and belowground resource availability and uptake capacity at the regional scales.
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