Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source

Predicting future plant and ecosystem responses to elevated CO2 also requires an understanding of the role of other factors, especially soil nitrogen. This is particularly challenging for global aridlands where total N and the relative amounts of nitrate and ammonia vary both spatially and seasonall...

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Detalles Bibliográficos
Publicado: 2006
Materias:
Ammonia-N
Global change
Nitrate-N
Phenolic compounds
Prosopis flexuosa
Prosopis glandulosa
Rangeland
ammonia
arid region
botany
carbon
gas exchange
metabolism
nitrate
soil nitrogen
Fabaceae
Prosopis
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v93_n5_p716_Causin
http://hdl.handle.net/20.500.12110/paper_00029122_v93_n5_p716_Causin
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00029122_v93_n5_p716_Causin
record_format dspace
spelling paper:paper_00029122_v93_n5_p716_Causin2023-06-08T14:23:03Z Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source Ammonia-N Global change Nitrate-N Phenolic compounds Prosopis flexuosa Prosopis glandulosa Rangeland ammonia arid region botany carbon gas exchange metabolism nitrate soil nitrogen Fabaceae Prosopis Prosopis flexuosa Prosopis glandulosa Predicting future plant and ecosystem responses to elevated CO2 also requires an understanding of the role of other factors, especially soil nitrogen. This is particularly challenging for global aridlands where total N and the relative amounts of nitrate and ammonia vary both spatially and seasonally. We measured gas exchange and primary and secondary C metabolites in seedlings of two dominant aridland shrub species (Prosopis flexuosa [S America] and P. glandulosa [N America]) grown at ambient (350 ppm) or elevated (650 ppm) CO2 and nitrogen at two levels (low [0.8 mM] and high [8.0 mM]) and at either 1 : 1 or 3 : 1 nitrate to ammonia. Whereas elevated CO2 increased assimilation rate, water use efficiency, and primary carbon metabolites in both species, these increases were strongly contingent upon nitrogen availability. Elevated CO2 did not increase secondary metabolites (i.e., phenolics). For these important aridland species, the effects of elevated CO2 are strongly influenced by nitrogen availability and to a lesser extent by the relative amounts of nitrate and ammonia supplied, which underscores the importance of both the amount and chemical composition of soil nitrogen in mediating the potential responses of seedling growth and establishment of aridland plants under future CO2-enriched atmospheres. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v93_n5_p716_Causin http://hdl.handle.net/20.500.12110/paper_00029122_v93_n5_p716_Causin
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ammonia-N
Global change
Nitrate-N
Phenolic compounds
Prosopis flexuosa
Prosopis glandulosa
Rangeland
ammonia
arid region
botany
carbon
gas exchange
metabolism
nitrate
soil nitrogen
Fabaceae
Prosopis
Prosopis flexuosa
Prosopis glandulosa
spellingShingle Ammonia-N
Global change
Nitrate-N
Phenolic compounds
Prosopis flexuosa
Prosopis glandulosa
Rangeland
ammonia
arid region
botany
carbon
gas exchange
metabolism
nitrate
soil nitrogen
Fabaceae
Prosopis
Prosopis flexuosa
Prosopis glandulosa
Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source
topic_facet Ammonia-N
Global change
Nitrate-N
Phenolic compounds
Prosopis flexuosa
Prosopis glandulosa
Rangeland
ammonia
arid region
botany
carbon
gas exchange
metabolism
nitrate
soil nitrogen
Fabaceae
Prosopis
Prosopis flexuosa
Prosopis glandulosa
description Predicting future plant and ecosystem responses to elevated CO2 also requires an understanding of the role of other factors, especially soil nitrogen. This is particularly challenging for global aridlands where total N and the relative amounts of nitrate and ammonia vary both spatially and seasonally. We measured gas exchange and primary and secondary C metabolites in seedlings of two dominant aridland shrub species (Prosopis flexuosa [S America] and P. glandulosa [N America]) grown at ambient (350 ppm) or elevated (650 ppm) CO2 and nitrogen at two levels (low [0.8 mM] and high [8.0 mM]) and at either 1 : 1 or 3 : 1 nitrate to ammonia. Whereas elevated CO2 increased assimilation rate, water use efficiency, and primary carbon metabolites in both species, these increases were strongly contingent upon nitrogen availability. Elevated CO2 did not increase secondary metabolites (i.e., phenolics). For these important aridland species, the effects of elevated CO2 are strongly influenced by nitrogen availability and to a lesser extent by the relative amounts of nitrate and ammonia supplied, which underscores the importance of both the amount and chemical composition of soil nitrogen in mediating the potential responses of seedling growth and establishment of aridland plants under future CO2-enriched atmospheres.
title Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source
title_short Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source
title_full Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source
title_fullStr Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source
title_full_unstemmed Gas exchange and carbon metabolism in two Prosopis species (Fabaceae) from semiarid habitats: Effects of elevated CO2, N supply, and N source
title_sort gas exchange and carbon metabolism in two prosopis species (fabaceae) from semiarid habitats: effects of elevated co2, n supply, and n source
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00029122_v93_n5_p716_Causin
http://hdl.handle.net/20.500.12110/paper_00029122_v93_n5_p716_Causin
_version_ 1768544204112265216

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