Effect of moisture availability on photosynthetic productivity and autotrophic respiration of an oak stand

Effect of moisture availability on photosynthetic productivity and autotrophic respiration of an... The gas exchange of an oak stand in the southeastern forest steppe was examined under variable moisture availability and ambient temperature. For several years the CO2 exchange was measured concurrently on leafy shoots and nonphotosynthesizing organs (trunks, branches, and roots) of oak trees (Quercus robur L.). The root respiration was found to decrease upon moisture limitation. The trunk respiration was promoted by the increase in moisture deficiency until the predawn leaf water potential (PLWP) reduced to −1.5 MPa, and respiration declined gradually upon further reduction in moisture availability. The proportion between net and gross primary productivities (NPP/GPP) also depended on moisture availability. The NPP/GPP ratio was 0.49 under optimal conditions at PLWP of −0.5 MPa, but it approached zero when PLWP lowered to −1.5 MPa. Upon drought conditions, which are typical of southeastern steppe in the second half of summer, the oak stand lost its CO2 sink capacity and became the CO2 source. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Effect of moisture availability on photosynthetic productivity and autotrophic respiration of an oak stand

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2009 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Sciences ; Plant Physiology
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443709060065
Publisher site
See Article on Publisher Site

Abstract

The gas exchange of an oak stand in the southeastern forest steppe was examined under variable moisture availability and ambient temperature. For several years the CO2 exchange was measured concurrently on leafy shoots and nonphotosynthesizing organs (trunks, branches, and roots) of oak trees (Quercus robur L.). The root respiration was found to decrease upon moisture limitation. The trunk respiration was promoted by the increase in moisture deficiency until the predawn leaf water potential (PLWP) reduced to −1.5 MPa, and respiration declined gradually upon further reduction in moisture availability. The proportion between net and gross primary productivities (NPP/GPP) also depended on moisture availability. The NPP/GPP ratio was 0.49 under optimal conditions at PLWP of −0.5 MPa, but it approached zero when PLWP lowered to −1.5 MPa. Upon drought conditions, which are typical of southeastern steppe in the second half of summer, the oak stand lost its CO2 sink capacity and became the CO2 source.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Nov 6, 2009

References

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