期刊
NEW PHYTOLOGIST
卷 210, 期 3, 页码 815-826出版社
WILEY
DOI: 10.1111/nph.13828
关键词
economics spectrum; eudicots; fine-root traits; graminoids; nitrogen; plant diversity; root decomposability; root respiration
资金
- Fondation pour la Recherche sur la Biodiversite (FRB, France) through the 'projet innovant RESPIRS' [AAP-IN-2009-046]
- INRA (Jeune Equipe)
- Agence Nationale de la Recherche [O2LA ANR-09-STRA-09, Ecosfix ANR-10-STRA-003-001]
- Agence de l'Environnement et de la Maitrise de l'Energie (ADEME)
- Centre International d'etudes superieures en sciences agronomiques (Montpellier SupAgro)
Although fine roots are important components of the global carbon cycle, there is limited understanding of root structure-function relationships among species. We determined whether root respiration rate and decomposability, two key processes driving carbon cycling but always studied separately, varied with root morphological and chemical traits, in a coordinated way that would demonstrate the existence of a root economics spectrum (RES). Twelve traits were measured on fine roots (diameter 2mm) of 74 species (31 graminoids and 43 herbaceous and dwarf shrub eudicots) collected in three biomes. The findings of this study support the existence of a RES representing an axis of trait variation in which root respiration was positively correlated to nitrogen concentration and specific root length and negatively correlated to the root dry matter content, lignin:nitrogen ratio and the remaining mass after decomposition. This pattern of traits was highly consistent within graminoids but less consistent within eudicots, as a result of an uncoupling between decomposability and morphology, and of heterogeneity of individual roots of eudicots within the fine-root pool. The positive relationship found between root respiration and decomposability is essential for a better understanding of vegetation-soil feedbacks and for improving terrestrial biosphere models predicting the consequences of plant community changes for carbon cycling.
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