reference : The role of isohydric and anisohydric species in determining ecosystem-scale response to severe drought

JSON YAML text HTML Turtle N-Triples JSON Triples RDF+XML RDF+JSON Graphviz SVG
/reference/8b370b07-12b3-4307-878a-a8f98c1fd798
Bibliographic fields
reftype Journal Article
Abstract Ongoing shifts in the species composition of Eastern US forests necessitate the development of frameworks to explore how species-specific water-use strategies influence ecosystem-scale carbon (C) cycling during drought. Here, we develop a diagnostic framework to classify plant drought-response strategies along a continuum of isohydric to anisohydric regulation of leaf water potential (Ψ L). The framework is applied to a 3-year record of weekly leaf-level gas exchange and Ψ measurements collected in the Morgan-Monroe State Forest (Indiana, USA), where continuous observations of the net ecosystem exchange of CO2 (NEE) have been ongoing since 1999. A severe drought that occurred in the middle of the study period reduced the absolute magnitude of NEE by 55 %, though species-specific responses to drought conditions varied. Oak species were characterized by anisohydric regulation of Ψ L that promoted static gas exchange throughout the study period. In contrast, Ψ L of the other canopy dominant species was more isohydric, which limited gas exchange during the drought. Ecosystem-scale estimates of NEE and gross ecosystem productivity derived by upscaling the leaf-level data agreed well with tower-based observations, and highlight how the fraction of isohydric and anisohydric species in forests can mediate net ecosystem C balance.
Author Roman, D. T.; Novick, K. A.; Brzostek, E. R.; Dragoni, D.; Rahman, F.; Phillips, R. P.
DOI 10.1007/s00442-015-3380-9
Date November 01
ISSN 1432-1939
Issue 3
Journal Oecologia
Pages 641-654
Title The role of isohydric and anisohydric species in determining ecosystem-scale response to severe drought
Type of Article journal article
Volume 179
Year 2015
Bibliographic identifiers
_record_number 21954
_uuid 8b370b07-12b3-4307-878a-a8f98c1fd798