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Raffelsbauer, V.; Pucha-Cofrep, F.; Strobl, S.; Kn&uuml;sting, J.; Schorsch, M.; Trachte, K.; Scheibe, R.; Br&auml;uning, A.; Windhorst, D.; Bendix, J.; Silva, B. &amp; Beck, E. (2023): <b>Trees with anisohydric behavior as main drivers of nocturnal evapotranspiration in a tropical mountain rainforest</b>. <i>PloS ONE </i> <b>18</b>(3), 1-1.

Resource Description

Title: Trees with anisohydric behavior as main drivers of nocturnal evapotranspiration in a tropical mountain rainforest
FOR816dw ID: 1983
Publication Date: 2023-03-31
License and Usage Rights:
Resource Owner(s):
Individual: Volker Raffelsbauer
Contact:
Individual: Franz Pucha-Cofrep
Contact:
Individual: Simone Strobl
Contact:
Individual: Johannes Knüsting
Contact:
Individual: Michael Schorsch
Contact:
Individual: Katja Trachte
Contact:
Individual: Renate Scheibe
Contact:
Individual: Achim Bräuning
Contact:
Individual: David Windhorst
Contact:
Individual: Jörg Bendix
Contact:
Individual: Brenner Silva
Contact:
Individual: Erwin Beck
Contact:
Abstract:
This study addresses transpiration in a tropical evergreen mountain forest in the Ecuadorian<br/> Andes from the leaf to the stand level, with emphasis on nocturnal plant-water relations. The<br/> stand level: Evapotranspiration (ET) measured over 12 months with the Eddy-Covariance<br/> (ECov) technique proved as the major share (79%) of water received from precipitation. Irre-<br/> spective of the humid climate, the vegetation transpired day and night. On average, 15.3%<br/> of the total daily ET were due to nocturnal transpiration. Short spells of drought increased<br/> daily ET, mainly by enhanced nighttime transpiration. Following leaf transpiration rather<br/> than air temperature and atmospheric water vapor deficit, ET showed its maximum already<br/> in the morning hours. The tree level: Due to the humid climate, the total water consumption<br/> of trees was generally low. Nevertheless, xylem sap flux measurements separated the<br/> investigated tree species into a group showing relatively high and another one with low sap<br/> flux rates. The leaf level: Transpiration rates of Tapirira guianensis, a member of the high-<br/> flux-rate group, were more than twice those of Ocotea aciphylla, a representative of the<br/> group showing low sap flux rates. Representatives of the Tapirira group operated at a rela-<br/> tively high leaf water potential but with a considerable diurnal amplitude, while the leaves of<br/> the Ocotea group showed low water potential and small diurnal fluctuations. Overall, the<br/> Tapirira group performed anisohydrically and the Ocotea group isohydrically. Grouping of<br/> the tree species by their water relations complied with the extents of the diurnal stem circum-<br/> ference fluctuations. Nighttime transpiration and hydrological type: In contrast to the isohy-<br/> drically performing trees of the Ocotea group, the anisohydric trees showed considerable<br/> water vapour pressure deficit (VPD)-dependent nocturnal transpiration. Therefore, we con-<br/> clude that nighttime ET at the forest level is mainly sourced by the tree species with aniso-<br/> hydric performance.
Keywords:
| dendrometer | Evapotranspiration | Sap flux | Eddy covariance |
Literature type specific fields:
ARTICLE
Journal: PloS ONE
Volume: 18
Issue: 3
Page Range: 1-1
Metadata Provider:
Individual: Volker Raffelsbauer
Contact:
Online Distribution:
Download File: http://www.tropicalmountainforest.org/publications.do?citid=1983


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