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

Roman, D. T ; Novick, K. A ; Brzostek, E. R ; Dragoni, D ; Rahman, F ; Phillips, R. P

Oecologia, 2015-11, Vol.179 (3), p.641-654 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
role of isohydric and anisohydric species in determining ecosystem-scale response to severe drought
Autor: Roman, D. T ; Novick, K. A ; Brzostek, E. R ; Dragoni, D ; Rahman, F ; Phillips, R. P
Assuntos: Adaptation, Physiological ; Biomedical and Life Sciences ; canopy ; carbon ; Carbon - metabolism ; Carbon Cycle ; carbon dioxide ; Carbon Dioxide - metabolism ; drought ; Droughts ; Ecology ; Ecosystems ; Environmental aspects ; Forest reserves ; Forests ; gas exchange ; Hydrology/Water Resources ; Laws, regulations and rules ; leaf water potential ; Life Sciences ; net ecosystem exchange ; Photosynthesis ; PHYSIOLOGICAL ECOLOGY ; Physiological ecology - Original research ; Plant Leaves - physiology ; Plant Sciences ; Plant Transpiration ; Quercus - physiology ; species diversity ; Species Specificity ; Stress, Physiological ; Trees - physiology ; Water - physiology ; Water use
É parte de: Oecologia, 2015-11, Vol.179 (3), p.641-654
Notas: http://dx.doi.org/10.1007/s00442-015-3380-9
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Descrição: 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.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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

Roman, D. T ; Novick, K. A ; Brzostek, E. R ; Dragoni, D ; Rahman, F ; Phillips, R. P

Berlin/Heidelberg: Springer Berlin Heidelberg

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