Interannual variability of ecosystem iso/anisohydry is regulated by environmental dryness

Interannual variability of ecosystem iso/anisohydry is regulated by environmental dryness

© 2020 The Authors New Phytologist © 2020 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 229(2021), 5 vom: 29. März, Seite 2562-2575
1. Verfasser: Wu, Genghong (VerfasserIn)
Weitere Verfasser: Guan, Kaiyu, Li, Yan, Novick, Kimberly A, Feng, Xue, McDowell, Nate G, Konings, Alexandra G, Thompson, Sally E, Kimball, John S, De Kauwe, Martin G, Ainsworth, Elizabeth A, Jiang, Chongya
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2021
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, U.S. Gov't, Non-P.H.S. anisohydry dryness interannual variability isohydry leaf water potential vegetation optical depth (VOD) Water 059QF0KO0R
Beschreibung
Zusammenfassung:© 2020 The Authors New Phytologist © 2020 New Phytologist Trust.
●Plants are characterized by the iso/anisohydry continuum depending on how they regulate leaf water potential (ΨL ). However, how iso/anisohydry changes over time in response to year-to-year variations in environmental dryness and how such responses vary across different regions remains poorly characterized. ●We investigated how dryness, represented by aridity index, affects the interannual variability of ecosystem iso/anisohydry at the regional scale, estimated using satellite microwave vegetation optical depth (VOD) observations. This ecosystem-level analysis was further complemented with published field observations of species-level ΨL . ●We found different behaviors in the directionality and sensitivity of isohydricity (σ) with respect to the interannual variation of dryness in different ecosystems. These behaviors can largely be differentiated by the average dryness of the ecosystem itself: in mesic ecosystems, σ decreases in drier years with a higher sensitivity to dryness; in xeric ecosystems, σ increases in drier years with a lower sensitivity to dryness. These results were supported by the species-level synthesis. ●Our study suggests that how plants adjust their water use across years - as revealed by their interannual variability in isohydricity - depends on the dryness of plants' living environment. This finding advances our understanding of plant responses to drought at regional scales
Beschreibung:Date Completed 14.05.2021
Date Revised 14.05.2021
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.17040