Experimental vs. modeled water use in mature Norway spruce (Picea abies) exposed to elevated CO<subscript>2</subscript>.
In: Frontiers in Plant Science, Jg. 3 (2012-10-01), S. 1-11
Online
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Zugriff:
Rising levels of atmospheric CO 2 have often been reported to reduce plant water use. Such behavior is also predicted by standard equations relating photosynthesis, stomatal conductance, and atmospheric CO 2 concentration, which form the core of dynamic global vegetation models (DGVMs). Here, we provide first results from a free air CO 2 enrichment (FACE) experiment with naturally growing, mature (35 m) Picea abies (L.) (Norway spruce) and compare them to simulations by the DGVM LPJ-GUESS. We monitored sap flow, stem water deficit, stomatal conductance, leaf water potential, and soil moisture in five 35-40 m tall CO 2 -treated (550 ppm) trees over two seasons. Using LPJ-GUESS, we simulated this experiment using climate data from a nearby weather station. While the model predicted a stable reduction of transpiration of between 9% and 18% (at concentrations of 550-700 ppm atmospheric CO 2 ), the combined evidence from various methods characterizing water use in our experimental trees suggest no changes in response to future CO 2 concentrations. The discrepancy between the modeled and the experimental results may be a scaling issue: while dynamic vegetation models correctly predict leaf-level responses, they may not sufficiently account for the processes involved at the canopy and ecosystem scale, which could offset the first-order stomatal response. [ABSTRACT FROM AUTHOR]
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Titel: |
Experimental vs. modeled water use in mature Norway spruce (Picea abies) exposed to elevated CO<subscript>2</subscript>.
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Autor/in / Beteiligte Person: | Leuzinger, Sebastian ; Bader, Martin K. F. |
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Zeitschrift: | Frontiers in Plant Science, Jg. 3 (2012-10-01), S. 1-11 |
Veröffentlichung: | 2012 |
Medientyp: | academicJournal |
ISSN: | 1664-462X (print) |
DOI: | 10.3389/fpls.2012.00229 |
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