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Volumn 298, Issue 5600, 2002, Pages 1987-1990

Grassland responses to global environmental changes suppressed by elevated CO2

Author keywords

[No Author keywords available]

Indexed keywords

CARBON DIOXIDE; ECOSYSTEMS; NITROGEN; VEGETATION;

EID: 0037032814     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1075312     Document Type: Article
Times cited : (470)

References (47)
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    • note
    • Research was conducted at Stanford University's Jasper Ridge Biological Preserve in central California (37°24′N, 122°14′W, elevation 150 m) between October 1998 and June 2001. The grassland is dominated by annual grasses (Arena barbata and Bromus hordeaceus) and forbs (Geranium dissectum and Erodium botrys). Typical of a Mediterranean climate, the growing season (October to May) is cool and wet, and the summer (June through September) is hot and dry.
  • 19
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    • note
    • 2, temperature, N deposition, and precipitation was replicated 8 times.
  • 20
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    • note
    • We measured aboveground biomass on two dates, 1 month apart, by harvesting all live and senesced vegetation and litter within a designated harvest area. We report the greater of the two harvests for each treatment. Three 22-mm-diameter soil cores made to a depth of 15 cm were taken within the aboveground harvest area, 2 days after the first aboveground harvest. Soils were wet-sieved through 0.5-mm mesh. Live roots were separated from dead roots. We did not account for additional NPP in root turnover, which, on the basis of other studies at this site, may increase annual root production by 44 to 54% (46).
  • 21
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    • note
    • 2, warming, precipitation, and temperature. The full model is described in (37). The data were logarithmically transformed.
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    • note
    • A Student's t test paired by block was performed on logarithmically transformed data. See supporting online material available on Science Online.
  • 30
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    • note
    • 2. Seven of these eight pairs have elevated levels of one or more of the following factors: warming, precipitation, or N inputs (see supporting online material).
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    • note
    • 2 was to decrease NPP. The data were logarithmically transformed.
  • 37
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    • thesis, Stanford University
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  • 47
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    • note
    • Thanks to all of the people who helped with the JRGCE: building, harvesting, counting, and sorting. Thanks also to Jasper Ridge Biological Preserve. Supported by grants from NSF, the Morgan Family Foundation, the David and Lucile Packard Foundation, the Jasper Ridge Biological Preserve, and the Carnegie Institution of Washington. M.R.S. was supported by a Hollaender Postdoctoral Fellowship from the U.S. Department of Energy. E.S.Z. and E.E.C. received graduate support from the U.S. Environmental Protection Agency STAR Fellowship Program, the Switzer Foundation, and the A. W. Mellon Foundation. This is Carnegie Institution of Washington, Department of Global Ecology. Publication number 1.


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