Abstract
Short rotation coppice (SRC) plantations are predominantly established as monocultures. Reasons include simplicity and thus efficiency in planting, homogeneous growth, and a desire to maximize yields by selecting top-performing species. However, pests and disease outbreaks generally cause much greater damage to monocultures than to mixed plantations, thus affecting yields as well as other ecosystem services. Mixed SRC with varying genotypes or even species have the potential to positively affect biodiversity and ecosystem services, however, little is known about the quantity and quality of woody biomass from mixed SRC in respect to its use for energy generation. Therefore, we tested how volume, calorific value, and ash content of woody biomass are influenced by (1) diversity in genotypes in a Salix SRC, and (2) diversity of species in a Salix, Robinia, Paulownia, and Populus SRC. Results show that increasing the number of genotypes or species in a SRC plantation does not negatively affect woody biomass, calorific value, or ash content of wood chips. On average, the plots with mixed genotypes or tree species produced more biomass compared with monocultures of the component species. We found evidence of overyielding in mixtures of poplar and robinia. Our findings are relevant for managers planning new SRC plantations and indicated that mixtures of specific tree species or genotypes should be considered. Therefore, we argue that “high-diversity SRC” plantations represent a valuable alternative to conventional SRC for sustainable bioenergy production.
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Acknowledgments
We thank Gabriele Thoma and Alexandra Böminghaus for technical assistance and the maintenance of the field site, and several assistants for helping with the biomass harvest. We also thank Tobias Gebauer for scientific advice. We thank Uwe Uhlich for technical assistance and support in the determination of the ash content and the calorific value.
The establishment of the mixed species SRC (“HighDiv-SRC”) site was financially supported by a grant from the Ministry of Science, Research, and the Arts of Baden-Württemberg (grant 7533-10-5-82) to MSL.
CA acknowledges generous support by the bioeconomy graduate program BBW ForWerts, supported by the Ministry of Science, Research and the Arts of Baden-Württemberg. JS acknowledges support by the European Social Fund and by the Ministry of Science, Research and Arts Baden-Württemberg.
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All authors contributed to the conception and the design of the study; JS and CA organized the data collection and analysis; JS and CA contributed equally to this work; CA and CN performed the statistical analysis; JS and CA wrote the paper with contributions from all other authors. All authors contributed to manuscript revision, read, and approved the submitted version.
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Schweier, J., Arranz, C., Nock, C.A. et al. Impact of Increased Genotype or Species Diversity in Short Rotation Coppice on Biomass Production and Wood Characteristics. Bioenerg. Res. 12, 497–508 (2019). https://doi.org/10.1007/s12155-019-09997-2
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DOI: https://doi.org/10.1007/s12155-019-09997-2