Species selection determines carbon allocation and turnover in Miscanthus crops: Implications for biomass production and C sequestration.

Autor: Briones MJI; Departamento de Ecología y Biología Animal, Universidade de Vigo, 36310 Vigo, Spain; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, UK. Electronic address: mbriones@uvigo.es., Massey A; Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Gogerddan, Aberystwyth, UK., Elias DMO; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, UK., McCalmont JP; School of Biological Sciences, University of Aberdeen, King's College, Aberdeen AB24 3FX, UK., Farrar K; Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Gogerddan, Aberystwyth, UK., Donnison I; Institute of Biological, Environmental and Rural Sciences (IBERS), Aberystwyth University, Gogerddan, Aberystwyth, UK., McNamara NP; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, UK.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 Aug 20; Vol. 887, pp. 164003. Date of Electronic Publication: 2023 May 09.
DOI: 10.1016/j.scitotenv.2023.164003
Abstrakt: Growing Miscanthus species and hybrids has received strong scientific and commercial support, with the majority of the carbon (C) modelling predictions having focused on the high-yield, sterile and noninvasive hybrid Miscanthus × giganteus. However, the potential of other species with contrasting phenotypic and physiological traits has been seldom explored. To better understand the mechanisms underlying C allocation dynamics in these bioenergy crops, we pulse-labelled ( 13 CO 2 ) intact plant-soil systems of Miscanthus × giganteus (GIG), Miscanthus sinensis (SIN) and Miscanthus lutarioriparius (LUT) and regularly analysed soil respiration, leaves, stems, rhizomes, roots and soils for up to 190 days until leaf senescence. A rapid isotopic enrichment of all three species was observed after 4 h, with the amount of 13 C fixed into plant biomass being inversely related to their respective standing biomass prior to pulse-labelling (i.e., GIG < SIN < LUT). However, both GIG and LUT allocated more photoassimilates in the aboveground biomass (leaves+stems = 78 % and 74 %, respectively) than SIN, which transferred 30% of fixed 13 C in its belowground biomass (rhizomes+roots). Although less fixed 13 C was recovered from the soils (<1 %), both rhizospheric and bulk soils were signficantly more enriched under SIN and LUT than under GIG. Importantly, the soils under SIN emitted less CO 2 , which suggests it could be the best choice for reaching C neutrality. These results from this unique large-scale study indicate that careful species selection may hold the success for reaching net GHG mitigation.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: N.P. McNamara, D.M.O. Elias reports financial support was provided by Natural Environment Research Council. K. Farrar, I. Donninson reports financial support was provided by Biotechnology and Biological Sciences Research Council.
(Copyright © 2023 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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