Re-assessment of plant carbon dynamics at the Duke free-air CO(2) enrichment site: interactions of atmospheric [CO(2)] with nitrogen and water availability over stand development.
Journal Article (Journal Article)
*The potential for elevated [CO(2)]-induced changes to plant carbon (C) storage, through modifications in plant production and allocation of C among plant pools, is an important source of uncertainty when predicting future forest function. Utilizing 10 yr of data from the Duke free-air CO(2) enrichment site, we evaluated the dynamics and distribution of plant C. *Discrepancy between heights measured for this study and previously calculated heights required revision of earlier allometrically based biomass determinations, resulting in higher (up to 50%) estimates of standing biomass and net primary productivity than previous assessments. *Generally, elevated [CO(2)] caused sustained increases in plant biomass production and in standing C, but did not affect the partitioning of C among plant biomass pools. Spatial variation in net primary productivity and its [CO(2)]-induced enhancement was controlled primarily by N availability, with the difference between precipitation and potential evapotranspiration explaining most interannual variability. Consequently, [CO(2)]-induced net primary productivity enhancement ranged from 22 to 30% in different plots and years. *Through quantifying the effects of nutrient and water availability on the forest productivity response to elevated [CO(2)], we show that net primary productivity enhancement by elevated [CO(2)] is not uniform, but rather highly dependent on the availability of other growth resources.
Full Text
Duke Authors
Cited Authors
- McCarthy, HR; Oren, R; Johnsen, KH; Gallet-Budynek, A; Pritchard, SG; Cook, CW; Ladeau, SL; Jackson, RB; Finzi, AC
Published Date
- January 2010
Published In
Volume / Issue
- 185 / 2
Start / End Page
- 514 - 528
PubMed ID
- 19895671
Electronic International Standard Serial Number (EISSN)
- 1469-8137
International Standard Serial Number (ISSN)
- 0028-646X
Digital Object Identifier (DOI)
- 10.1111/j.1469-8137.2009.03078.x
Language
- eng