Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three approaches to determine water-use efficiency.
Identifieur interne : 004304 ( Main/Curation ); précédent : 004303; suivant : 004305Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three approaches to determine water-use efficiency.
Auteurs : Francesco Ripullone [Italie] ; Marco Lauteri ; Giacomo Grassi ; Mariana Amato ; Marco BorghettiSource :
- Tree physiology [ 0829-318X ] ; 2004.
Descripteurs français
- KwdFr :
- MESH :
- physiologie : Arbres, Azote, Eau, Feuilles de plante, Populus, Pseudotsuga, Transpiration des plantes.
- Biomasse.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Nitrogen, Water.
- physiology : Plant Leaves, Plant Transpiration, Populus, Pseudotsuga, Trees.
- Biomass.
Abstract
We studied the effects of three nitrogen (N) supply rates (low, intermediate and high) on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings and poplar clone "I-214" (Populus x euroamericana (Dole) Guinier) cuttings growing in mini-stands. Our specific objectives were to: (1) evaluate the effects of N supply on water-use efficiency (WUE) and biomass production; (2) determine if N affects WUE through control of carbon assimilation rates or through stomatal control of water loss; and (3) compare three methods of estimating WUE: one short-term method (WUE(i), based on gas exchange measurements) and two long-term methods (WUE(T), based on the ratio between biomass production and transpired water, and Delta, based on leaf carbon isotope discrimination tested as a proxy of WUE). In both species, biomass production, WUE(i) and WUE(T) increased with increasing N supply, but there was no effect of N supply on either transpiration or stomatal conductance and Delta was negatively related to leaf N concentration. Plots of Delta versus both WUE(i) and WUE(T) revealed negative trends, but the regression between WUE(i) and Delta was significant only for Douglas-fir, and the regression between WUE(T) and Delta was significant only for poplar. Thus, the mechanisms underlying the response of WUE to N supply were mainly related to a positive effect of N supply on photosynthetic rates. The data confirm that carbon isotope discrimination may be a useful proxy of WUE. The finding that N availability enhances both biomass production and WUE may have practical implications in regions where these factors impose constraints on forest productivity.
DOI: 10.1093/treephys/24.6.671
PubMed: 15059767
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<affiliation wicri:level="1"><nlm:affiliation>Dipartimento di Produzione Vegetale, Università della Basilicata, 85100 Potenza, Italy. rf464agr@unibas.it</nlm:affiliation>
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<wicri:regionArea>Dipartimento di Produzione Vegetale, Università della Basilicata, 85100 Potenza</wicri:regionArea>
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<author><name sortKey="Lauteri, Marco" sort="Lauteri, Marco" uniqKey="Lauteri M" first="Marco" last="Lauteri">Marco Lauteri</name>
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<author><name sortKey="Grassi, Giacomo" sort="Grassi, Giacomo" uniqKey="Grassi G" first="Giacomo" last="Grassi">Giacomo Grassi</name>
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<author><name sortKey="Amato, Mariana" sort="Amato, Mariana" uniqKey="Amato M" first="Mariana" last="Amato">Mariana Amato</name>
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<author><name sortKey="Borghetti, Marco" sort="Borghetti, Marco" uniqKey="Borghetti M" first="Marco" last="Borghetti">Marco Borghetti</name>
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<term>Nitrogen (physiology)</term>
<term>Plant Leaves (physiology)</term>
<term>Plant Transpiration (physiology)</term>
<term>Populus (physiology)</term>
<term>Pseudotsuga (physiology)</term>
<term>Trees (physiology)</term>
<term>Water (physiology)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Arbres (physiologie)</term>
<term>Azote (physiologie)</term>
<term>Biomasse (MeSH)</term>
<term>Eau (physiologie)</term>
<term>Feuilles de plante (physiologie)</term>
<term>Populus (physiologie)</term>
<term>Pseudotsuga (physiologie)</term>
<term>Transpiration des plantes (physiologie)</term>
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<term>Water</term>
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<term>Feuilles de plante</term>
<term>Populus</term>
<term>Pseudotsuga</term>
<term>Transpiration des plantes</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Leaves</term>
<term>Plant Transpiration</term>
<term>Populus</term>
<term>Pseudotsuga</term>
<term>Trees</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Biomass</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Biomasse</term>
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<front><div type="abstract" xml:lang="en">We studied the effects of three nitrogen (N) supply rates (low, intermediate and high) on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings and poplar clone "I-214" (Populus x euroamericana (Dole) Guinier) cuttings growing in mini-stands. Our specific objectives were to: (1) evaluate the effects of N supply on water-use efficiency (WUE) and biomass production; (2) determine if N affects WUE through control of carbon assimilation rates or through stomatal control of water loss; and (3) compare three methods of estimating WUE: one short-term method (WUE(i), based on gas exchange measurements) and two long-term methods (WUE(T), based on the ratio between biomass production and transpired water, and Delta, based on leaf carbon isotope discrimination tested as a proxy of WUE). In both species, biomass production, WUE(i) and WUE(T) increased with increasing N supply, but there was no effect of N supply on either transpiration or stomatal conductance and Delta was negatively related to leaf N concentration. Plots of Delta versus both WUE(i) and WUE(T) revealed negative trends, but the regression between WUE(i) and Delta was significant only for Douglas-fir, and the regression between WUE(T) and Delta was significant only for poplar. Thus, the mechanisms underlying the response of WUE to N supply were mainly related to a positive effect of N supply on photosynthetic rates. The data confirm that carbon isotope discrimination may be a useful proxy of WUE. The finding that N availability enhances both biomass production and WUE may have practical implications in regions where these factors impose constraints on forest productivity.</div>
</front>
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<ArticleTitle>Variation in nitrogen supply changes water-use efficiency of Pseudotsuga menziesii and Populus x euroamericana; a comparison of three approaches to determine water-use efficiency.</ArticleTitle>
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<Abstract><AbstractText>We studied the effects of three nitrogen (N) supply rates (low, intermediate and high) on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings and poplar clone "I-214" (Populus x euroamericana (Dole) Guinier) cuttings growing in mini-stands. Our specific objectives were to: (1) evaluate the effects of N supply on water-use efficiency (WUE) and biomass production; (2) determine if N affects WUE through control of carbon assimilation rates or through stomatal control of water loss; and (3) compare three methods of estimating WUE: one short-term method (WUE(i), based on gas exchange measurements) and two long-term methods (WUE(T), based on the ratio between biomass production and transpired water, and Delta, based on leaf carbon isotope discrimination tested as a proxy of WUE). In both species, biomass production, WUE(i) and WUE(T) increased with increasing N supply, but there was no effect of N supply on either transpiration or stomatal conductance and Delta was negatively related to leaf N concentration. Plots of Delta versus both WUE(i) and WUE(T) revealed negative trends, but the regression between WUE(i) and Delta was significant only for Douglas-fir, and the regression between WUE(T) and Delta was significant only for poplar. Thus, the mechanisms underlying the response of WUE to N supply were mainly related to a positive effect of N supply on photosynthetic rates. The data confirm that carbon isotope discrimination may be a useful proxy of WUE. The finding that N availability enhances both biomass production and WUE may have practical implications in regions where these factors impose constraints on forest productivity.</AbstractText>
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