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Statements

Subject Item
n2:RIV%2F60076658%3A12310%2F14%3A43887411%21RIV15-GA0-12310___
rdf:type
skos:Concept n10:Vysledek
dcterms:description
Cellulose delta O-18 and delta D can provide insights on climates and hydrological cycling in the distant past and how these factors differ spatially. However, most studies of plant cellulose have used only one isotope, most commonly delta O-18, resulting in difficulties partitioning variation in delta O-18 of precipitation vs. evaporative conditions that affect leaf water isotopic enrichment. Moreover, observations of pronounced diurnal differences from conventional steady-state model predictions of leaf water isotopic fractionation have cast some doubt on single isotope modeling approaches for separating precipitation and evaporation drivers of cellulose delta O-18 or delta D. We explore a dual isotope approach akin to the concept of deuterium-excess (d), to establish deuterium deviations from the global meteoric water line in leaf water (Delta d(l)) as driven by relative humidity (RH). To demonstrate this concept, we survey studies of leaf water delta O-18 and delta D in hardwood vs. conifer trees. We then apply the concept to cellulose delta O-18 and delta D using a mechanistic model of cellulose delta O-18 and delta D to reconstruct deuterium deviations from the global meteoric water line (Delta d(c)) in Quercus macrocarpa, Q. robur, and Pseudotsuga menziesii. For each species, Delta d(c) showed strong correlations with RH across sites. Delta d(c) agreed well with steady-state predictions for Q. macrocarpa, while for Q. robur, the relationship with RH was steeper than expected. The slope of Delta d(c) vs. RH of P. menziesii was also close to steady-state predictions, but Delta d(c) were more enriched than predicted. This is in agreement with our leaf water survey showing conifer Delta d(l) was more enriched than predicted. Our data reveal that applications of this method should be appropriate for reconstructing RH from cellulose delta O-18 and delta D after accounting for differences between hardwoods and conifers Cellulose delta O-18 and delta D can provide insights on climates and hydrological cycling in the distant past and how these factors differ spatially. However, most studies of plant cellulose have used only one isotope, most commonly delta O-18, resulting in difficulties partitioning variation in delta O-18 of precipitation vs. evaporative conditions that affect leaf water isotopic enrichment. Moreover, observations of pronounced diurnal differences from conventional steady-state model predictions of leaf water isotopic fractionation have cast some doubt on single isotope modeling approaches for separating precipitation and evaporation drivers of cellulose delta O-18 or delta D. We explore a dual isotope approach akin to the concept of deuterium-excess (d), to establish deuterium deviations from the global meteoric water line in leaf water (Delta d(l)) as driven by relative humidity (RH). To demonstrate this concept, we survey studies of leaf water delta O-18 and delta D in hardwood vs. conifer trees. We then apply the concept to cellulose delta O-18 and delta D using a mechanistic model of cellulose delta O-18 and delta D to reconstruct deuterium deviations from the global meteoric water line (Delta d(c)) in Quercus macrocarpa, Q. robur, and Pseudotsuga menziesii. For each species, Delta d(c) showed strong correlations with RH across sites. Delta d(c) agreed well with steady-state predictions for Q. macrocarpa, while for Q. robur, the relationship with RH was steeper than expected. The slope of Delta d(c) vs. RH of P. menziesii was also close to steady-state predictions, but Delta d(c) were more enriched than predicted. This is in agreement with our leaf water survey showing conifer Delta d(l) was more enriched than predicted. Our data reveal that applications of this method should be appropriate for reconstructing RH from cellulose delta O-18 and delta D after accounting for differences between hardwoods and conifers
dcterms:title
Reconstructing relative humidity from plant delta 18O and delta D as deuterium deviations from the global meteoric water line Reconstructing relative humidity from plant delta 18O and delta D as deuterium deviations from the global meteoric water line
skos:prefLabel
Reconstructing relative humidity from plant delta 18O and delta D as deuterium deviations from the global meteoric water line Reconstructing relative humidity from plant delta 18O and delta D as deuterium deviations from the global meteoric water line
skos:notation
RIV/60076658:12310/14:43887411!RIV15-GA0-12310___
n3:aktivita
n7:P
n3:aktivity
P(GAP501/12/1261)
n3:cisloPeriodika
5
n3:dodaniDat
n14:2015
n3:domaciTvurceVysledku
n11:4511700
n3:druhVysledku
n9:J
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
41626
n3:idVysledku
RIV/60076658:12310/14:43887411
n3:jazykVysledku
n18:eng
n3:klicovaSlova
water isotopes; relative humidity; leaf water; leaf vapor pressure; deuterium-excess; delta O-18; delta D; cellulose
n3:klicoveSlovo
n4:relative%20humidity n4:deuterium-excess n4:delta%20D n4:leaf%20vapor%20pressure n4:leaf%20water n4:cellulose n4:water%20isotopes n4:delta%20O-18
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[53BA6E77B54A]
n3:nazevZdroje
ECOLOGICAL APPLICATIONS
n3:obor
n13:CE
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
10
n3:projekt
n5:GAP501%2F12%2F1261
n3:rokUplatneniVysledku
n14:2014
n3:svazekPeriodika
24
n3:tvurceVysledku
Brooks, Renee Voelker, Steven L. Pazdur, Anna Pawelczyk, Slawomira Šantrůček, Jiří Hartsough, Peter Meinzer, Frederick C. Plavcova, Lenka Snyder, Keirith Roden, John
n3:wos
000338109700006
s:issn
1051-0761
s:numberOfPages
16
n16:organizacniJednotka
12310