2002
DOI: 10.1126/science.1075312
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Grassland Responses to Global Environmental Changes Suppressed by Elevated CO 2

Abstract: Simulated global changes, including warming, increased precipitation, and nitrogen deposition, alone and in concert, increased net primary production (NPP) in the third year of ecosystem-scale manipulations in a California annual grassland. Elevated carbon dioxide also increased NPP, but only as a single-factor treatment. Across all multifactor manipulations, elevated carbon dioxide suppressed root allocation, decreasing the positive effects of increased temperature, precipitation, and nitrogen deposition on N… Show more

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Cited by 509 publications
(480 citation statements)
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“…We quantify microbial amino sugars in surface soils (0-10 cm) from a California annual grassland ecosystem after a continuous 9-year manipulation of three global change factors (elevated CO 2 , warming and N deposition), alone or in combination, at the JRGCE 23 . We report microbial residue abundance using amino sugar proportion of soil total C (AS/TC), indicating relative accumulation of microbial residues in the soil C pool.…”
Section: Resultsmentioning
confidence: 99%
See 2 more Smart Citations
“…We quantify microbial amino sugars in surface soils (0-10 cm) from a California annual grassland ecosystem after a continuous 9-year manipulation of three global change factors (elevated CO 2 , warming and N deposition), alone or in combination, at the JRGCE 23 . We report microbial residue abundance using amino sugar proportion of soil total C (AS/TC), indicating relative accumulation of microbial residues in the soil C pool.…”
Section: Resultsmentioning
confidence: 99%
“…The JRGCE was established in a grassland ecosystem in the eastern foothills of the Santa Cruz Mountains at the Jasper Ridge Biological Preserve in the San Francisco Bay area 23 . The region experiences a Mediterranean climate, and is generally dominated by annual nonnative grasses Avena barbata and Avena fatua.…”
Section: Methodsmentioning
confidence: 99%
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“…At this site, grasses flower significantly earlier than forbs under ambient conditions, but elevated CO 2 and N deposition reduced the difference in flowering date between these two groups, increasing temporal overlap, decreasing phenological complementarity, and potentially increasing competition for one or more resources. In the JRGCE, elevated CO 2 suppressed the tendency of other environmental changes to stimulate primary production (40,41). Decreased phenological complementarity is one mechanism that could lead to such an effect, whereby delayed growth and resource uptake by grasses could overlap into the temporal window of forb activity, thus reducing the contribution of late-active forbs to overall production.…”
Section: Discussionmentioning
confidence: 99%
“…The experimental design of the JRGCE (17,40,41) consists of plots arranged in a randomized block, split-plot design, with eight replicates of each treatment. Elevated CO 2 and warming were applied to whole circular plots (each 2-m diameter, 3.14-m 2 area), whereas N deposition and increased precipitation were applied in a factorial arrangement to four 0.78 m 2 quadrants within each plot.…”
Section: Methodsmentioning
confidence: 99%