Gas exchange parameters inferred from {delta}{sup 13}C of conifer annual rings throughout the 20th century
- Univ. of Idaho, Moscow, ID (United States)
- Forest Service, Moscow, ID (United States). Intermountain Research Station
In this study the stable isotopes of carbon in plant tissue provided a means of inferring the proportional decrease in carbon dioxide concentration across the stomata, which is closely related to photosynthetic water-use efficiency. The authors analyzed the stable carbon isotope composition of tree rings laid down over the past 80 years to determine whether the proportional decrease in CO{sub 2} concentration across the stomata had increased. Dominant and codominant trees of western white pine (Pinus monticola), ponderosa pine (P. ponderosa), and Douglas-fir (Pseudotsuga menziesii var. glauca) growing at the Priest River Experimental Forest, in northern Idaho, were analyzed. To avoid confounding age and year, the authors compared the innermost rings of mature trees to trees of intermediate age and to saplings. The isotopic data were corrected for changes in isotopic composition and carbon dioxide concentration using published data from ice cores.
- OSTI ID:
- 248086
- Report Number(s):
- CONF-9504248-; TRN: IM9628%%186
- Resource Relation:
- Conference: Interior west global change workshop, Ft. Collins, CO (United States), 25-27 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of Interior West global change workshop; Tinus, R.W. [ed.] [Forest Service, Flagstaff, AZ (United States). Rocky Mountain Forest and Range Experiment Station]; PB: 138 p.
- Country of Publication:
- United States
- Language:
- English
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