Na Na

No No

Yes Yes

C3 graminoids, C4 graminoids, and forbs

From Diaz and Cabido, 2001.

"Only studies assessing the impact of at least two components of plant diversity on ecosystem processes, and published in 1995 or later, were considered. Comparisons are qualitative and should be taken with caution, because unless a study explicitly has a test for species richness, functional richness, and functional composition in its design, it might lead to underestimation or misrepresentation of different components of diversity. Field studies differ markedly among themselves and with synthetic assemblages studies in approach, design, and intervening factors and thus strict comparison is not possible.

'Abbreviations: LAI, leaf area index; N, nitrogen.

cIn the case of species and functional richness, only positive effects were considered: No, either no effect or a negative effect. In the case of functional composition: Yes, any significant (positive or negative) effect; NA, not assessed.

dSpecies: vole, Arvicola terrestris; earthworms, Octolasion synaeum, Nicodrilus longus, Allolobophora rosea, A. chloroitica, Lumbricus terrestris, and L. castaneum.

eSpecies richness effect obvious only when annuals were included in analysis.

f Effect of increasing litter diversity on soil microbial biomass was not unidirectional: two- and four-species litter treatments decreased it, whereas five- and six-species treatments increased it.

gShannon Diversity Index.

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