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Variability of tree transpiration across three zones in a southeastern U.S. Piedmont watershed

hal.structure.identifierUSDA Forest Service Rocky Mountain Forest and Range Experiment Station
dc.contributor.authorBOGGS, Johnny
hal.structure.identifierUSDA Forest Service Rocky Mountain Forest and Range Experiment Station
dc.contributor.authorSUN, Ge
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierDuke University [Durham]
dc.contributor.authorDOMEC, Jean‐christophe
hal.structure.identifierUSDA Forest Service Rocky Mountain Forest and Range Experiment Station
dc.contributor.authorMCNULTY, Steven
dc.date.accessioned2024-04-08T11:49:41Z
dc.date.available2024-04-08T11:49:41Z
dc.date.issued2021-10
dc.identifier.issn0885-6087
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195350
dc.description.abstractEnQuantifying the spatial variability of species-specific tree transpiration across hillslopes is important for estimating watershed-scale evapotranspiration (ET) and predicting spatial drought effects on vegetation. The objectives of this study are to (1) assess sap flux density (J(s)) and tree-level transpiration (T-s) across three contrasting zones a (riparian buffer, mid-hillslope and upland-hillslope, (2) determine how species-specific J(s) responds to vapour pressure deficit (VPD) and (3) estimate watershed-level transpiration (T-w) using T-s derived from each zone. During 2015 and 2016, we measured J(s) in eight tree species in the three topographic zones in a small 12-ha forested watershed in the Piedmont region of central North Carolina. In the dry year of 2015, loblolly pine (Pinus taeda), Virginia pine (Pinus virginiana) and sweetgum (Liquidambar styraciflua) J(s) rates were significantly higher in the riparian buffer when compared to the other two zones. In contrast, J(s) rates in tulip poplar (Liriodendron tulipifera) and red maple (Acer rubrum) were significantly lower in the buffer than in the mid-hillslope. Daily T-s varied by zone and ranged from 10 to 93 L/day in the dry year and from 9 to 122 L/day in the wet year (2016). J(s) responded nonlinearly to VPD in all species and zones. Annual T-w was 447, 377 and 340 mm based on scaled-J(s) data for the buffer, mid-hillslope and upland-hillslope, respectively. We conclude that large spatial variability in J(s) and scaled T-w was driven by differences in soil moisture at each zone and forest composition. Consequently, spatial heterogeneity of vegetation and soil moisture must be considered when accurately quantifying watershed level ET.
dc.language.isoen
dc.publisherWiley
dc.subject.enforest hydrology
dc.subject.ensap flux
dc.subject.ensoil moisture
dc.subject.enwater balance
dc.title.enVariability of tree transpiration across three zones in a southeastern U.S. Piedmont watershed
dc.typeArticle de revue
dc.identifier.doi10.1002/hyp.14389
dc.subject.halSciences de l'environnement
bordeaux.journalHydrological Processes
bordeaux.volume35
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue10
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03477296
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03477296v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Hydrological%20Processes&rft.date=2021-10&rft.volume=35&rft.issue=10&rft.eissn=0885-6087&rft.issn=0885-6087&rft.au=BOGGS,%20Johnny&SUN,%20Ge&DOMEC,%20Jean%E2%80%90christophe&MCNULTY,%20Steven&rft.genre=article


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