NDLI: 13C content of ecosystem respiration is linked to precipitation and vapor pressure deficit

Content Provider	Springer Nature Link
Author	Bowling, David R. McDowell, Nate G. Bond, Barbara J. Law, Beverly E. Ehleringer, James R.
Copyright Year	2002
Abstract	Variation in the carbon isotopic composition of ecosystem respiration (δ13CR) was studied for 3 years along a precipitation gradient in western Oregon, USA, using the Keeling plot approach. Study sites included six coniferous forests, dominated by Picea sitchensis, Tsuga heterophylla, Pseudotsuga menziesii, Pinus ponderosa, and Juniperus occidentalis, and ranged in location from the Pacific coast to the eastern side of the Cascade Mountains (a 250-km transect). Mean annual precipitation across these sites ranged from 227 to 2,760 mm. Overall δ13CR varied from –23.1 to –33.1‰, and within a single forest, it varied in magnitude by 3.5–8.5‰. Mean annual δ13CR differed significantly in the forests and was strongly correlated with mean annual precipitation. The carbon isotope ratio of carbon stocks (leaves, fine roots, litter, and soil organic matter) varied similarly with mean precipitation (more positive at the drier sites). There was a strong link between δ13CR and the vapor saturation deficit of air (vpd) 5–10 days earlier, both across and within sites. This relationship is consistent with stomatal regulation of gas exchange and associated changes in photosynthetic carbon isotope discrimination. Recent freeze events caused significant deviation from the δ13CR versus vpd relationship, resulting in higher than expected δ13CR values.
Starting Page	113
Ending Page	124
Page Count	12
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	131
Issue Number	1
e-ISSN	14321939
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2002-03-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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