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• W2009777411 abstract "The effects of species richness and elevated CO 2 on community productivity under altered nutrient levels were studied in experimental herbaceous communities composed of species from the Midwestern United States annual community, which consists of three functional groups C 3 , C 4 and N‐fixers. Aboveground and belowground biomass were measured at flowering stage and at the end of the experiment when fruits of most plants were ripe. At the low nutrient level, species richness did not have a significant effect on community productivity. However, at the high nutrient level, the community biomass decreased with decreasing species richness at both ambient and elevated CO 2 in the first harvest, and at elevated CO 2 in the second harvest. At low nutrient level, CO 2 slightly increased community biomass at medium and high species richness. At high nutrient level, CO 2 significantly increased community biomass in all species‐richness treatments in the first harvest, but a significant response was observed only in the high richness treatment in the second harvest. At the functional group level, biomass of C 3 responded positively to CO 2 , and C 4 responded very negatively to CO 2 . The N‐fixers responded positively to CO 2 at low and medium species richness, but negatively at high species richness, showing a CO 2 ×richness interaction. CO 2 increased species evenness in the communities, depending on nutrient level. Species varied in the responses of light‐saturated net photosynthesis (P max ) to elevated CO 2 , even within functional groups. Our findings suggest that (1) the relationship between productivity and species diversity was dependent on nutrient levels. (2) Species diversity enhances responses of communities to elevated CO 2 . (3) Harvest time can affect the results of diversity‐productivity experiments. (4) Responses of C 3 , C 4 , and N‐fixers to elevated CO 2 in communities did not follow the prediction based on functional groups or plants grown individually, rather it depended on species richness." @default.
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• W2009777411 date "2002-06-01" @default.
• W2009777411 modified "2023-10-09" @default.
• W2009777411 title "Interactive effects of diversity, nutrients and elevated CO₂ on experimental plant communities" @default.
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• W2009777411 doi "https://doi.org/10.1034/j.1600-0706.2002.970304.x" @default.
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