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The relationship of plant species and functional diversities to community-level delta C-13, as a proxy for water carbon relations, was assessed in Pastures from two climatic regions in NE Spain. Overall, community delta C-13 was negatively related to species diversity, but positively related to functional diversity. However, pronounced differences between climatic regions were found: smaller variations in delta C-13 and thus carbon-water relations were observed for communities under humid conditions, which had higher species diversity but were more functionally redundant than communities under arid conditions. Thus, if species and functional diversities affect plant carbon-water relations at the Community and hence at the ecosystem level seems to depend strongly on functional redundancy, i.e., the overlap in plant traits among the species present. (C) 2009 Elsevier B.V. All rights reserved.