Tree species identity drives soil organic carbon storage more than species mixing in major two-species mixtures (pine, oak, beech) in Europe

FOREST ECOLOGY AND MANAGEMENT

卷:481

Article

Osei, Richard¹  Titeux, Hugues¹  Bielak, Kamil²  Bravo, Felipe³  Collet, Catherine⁴  Cools, Corentin¹  Cornelis, Jean-Thomas⁵  Heym, Michael⁶  Korboulewsky, Nathalie⁷  Lof, Magnus⁸  Muys, Bart⁹  Najib, Yasmina¹  Nothdurft, Arne¹⁰  Pach, Maciej¹¹  Pretzsch, Hans⁶  del Rio, Miren¹²  Ruiz-Peinado, Ricardo^3,12  Ponette, Quentin¹ 

[1] UCLouvain Univ Catholique Louvain, Earth & Life Inst, Croix Sud 2 Box L7-05-09, B-1348 Louvain La Neuve, Belgium

[2] Warsaw Univ Life Sci, Inst Forest Sci, Dept Silviculture, Nowoursynowska 159-34, PL-02776 Warsaw, Poland

[3] Univ Valladolid INIA, IuFOR Sustainable Forest Management Res Inst, Avda Madrid 44, Palencia 34004, Spain

[4] Univ Lorraine, AgroParisTech, INRAE, UMR Silva, F-54000 Nancy, France

[5] Univ Liege ULiege, Gembloux Agrobio Tech, Water Soil Plant Exchanges, TERRA Teaching & Res Ctr, Passage Deportes 2, B-5030 Gembloux, Belgium

[6] Tech Univ Munich, TUM Sch Life Sci Weihenstephan, Chair Forest Growth & Yield Sci, Hans Carl von Carlowitz Pl 2, D-85354 Freising Weihenstephan, Germany

[7] UR EFNO, INRAE, F-45290 Nogent Sur Vernisson, France

[8] Swedish Univ Agr Sci, Southern Swedish Forest Res Ctr, POB 49, S-23053 Alnarp, Sweden

[9] Katholieke Univ Leuven, Div Forest Nat & Landscape, Celestijnenlaan 200E,Box 2411, B-3001 Leuven, Belgium

[10] Univ Nat Resources & Life Sci, Dept Forest & Soil Sci, Inst Forest Growth, Peter Jordan Str 82, A-1190 Vienna, Austria

[11] Agr Univ Krakow, Fac Forestry, Dept Forest Ecol & Silviculture, Al 29 Listopada 46, PL-31425 Krakow, Poland

[12] INIA, Forest Res Ctr, Ctra A Coruna Km 7-5, Madrid 28040, Spain

关键词: Soil organic carbon;    Forest ecosystem services;    Tree species identity;    Tree species mixing;    Forest carbon sequestration;    Triplet-transects;   

DOI  :  10.1016/j.foreco.2020.118752

来源: Elsevier

【 摘 要 】

Mixed forests are usually associated with higher aboveground carbon storage compared to the corresponding monocultures but information on the impact of tree species mixing on soil organic carbon (SOC) is still limited. Yet, maximizing SOC storage is crucial for ecosystem C sequestration and many other ecosystem services. This study used a triplet approach (ie. two-species mixed stand and respective pure stands at the same site) to assess the impact of tree species identity and mixing on SOC storage in eight pine-oak, eight pine-beech and five beechoak triplets in Europe. We sampled the forest floor (FF) and 0-40 cm in the mineral soil per 10 cm interval. For each triplet type, we fitted basal area (BA) proportion of one component species (for species identity) and a BA-based plot-level True Shannon Diversity index (for species mixing) as explanatory variables for SOC stocks in linear mixed effects models, which included stone content and plot BA as covariates, and site as a random intercept. Considering the total soil depth (FF + 0-40 cm), species identity effect on SOC stocks was only significant for pine-beech and pine-oak triplets but explained more variability in SOC stocks than species mixing across triplet types. Species mixing effect was not significant for any triplet type in the total soil depth. While species identity consistently drove SOC storage in the topsoil layers across triplet types, species mixing explained more variability in SOC stocks in the deeper soil layers except for pine-oak triplets. The results showed that species identity is a stronger driver of SOC storage than species mixing. While tree species identity effect was strongly related to a conifers vs broadleaves signature, the drivers behind mixing effects remained elusive. The results suggest that targeted selection of tree species could better enhance SOC storage in European forests than a mere increase in species richness.

【 授权许可】

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