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1. Altered soil carbon dynamics under different land-use regimes in subtropical seasonally-dry forests of central Argentina.

Author

Conti, G., Kowaljow, E., Baptist, F., Rumpel, C., Cuchietti, A., Pérez Harguindeguy, N., and Díaz, S.

Subjects
*HUMUS, *CARBON sequestration in forests, *LIGNIN structure, *MOLECULAR structure, *ARID regions
Abstract

Background and aims: Subtropical seasonally dry forests from South America are now experiencing one of the highest rates of forest-cover change globally. These changes may affect the dynamics of soil organic carbon (SOC) including long-term stabilization processes, with profound consequences for the fertility and carbon storage of these ecosystems. Methods: In order to explore the effect of different land-use regimes on SOC dynamics, we determined the amount and quality of plant litter, the amount and quality (lignin and carbohydrate content) of SOC, and the soil basal respiration rates across seasonally dry Chaco forests of Argentina. Results: Changes in land-use regimes significantly reduced the amount of litter but not its quality. As a consequence, the SOC content was also reduced together with SOC quality. Unexpectedly, we found a higher CO release per SOC unit in soils with lower amount and quality of SOC. Conclusions: The results presented here show a clear effect of different land-use regimes on SOC dynamics through a reduction in the amount and quality of SOC. Additionally, we found that potential microbial activity is somehow disconnected from substrate quantity and quality, suggesting that the molecular structure of SOC is not significantly affecting long-term soil stabilization processes across these seasonally-dry ecosystems. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Altered soil carbon dynamics under different land-use regimes in subtropical seasonally-dry forests of central Argentina

Author

N. Pérez Harguindeguy, Sandra Díaz, F. Baptist, Cornelia Rumpel, Georgina Conti, Anibal Cuchietti, Esteban Kowaljow, Departamento de Diversidad Biológica y Ecología, Universidad Nacional de Córdoba [Argentina], Instituto Multidisciplinario de Biología Vegetal [Córdoba] (IMBIV), Facultad de Ciencias Exactas, Físicas y Naturales [Córdoba], Universidad Nacional de Córdoba [Argentina]-Universidad Nacional de Córdoba [Argentina]-Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET), Biotope [Mèze], Institut d'écologie et des sciences de l'environnement de Paris (iEES), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA), FONCyT [PICT-0365, PICT-0554], CONICET, SECyT-Universidad Nacional de Cordoba, Inter-American Institute for Global Change Research (IAI) CRN, US National Science Foundation [GEO-0452325, GEO-1138881], [SGP-CRA2015], Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Facultad de Ciencias Exactas, Físicas y Naturales [Córdoba], Universidad Nacional de Córdoba [Argentina]-Universidad Nacional de Córdoba [Argentina], Institut d'écologie et des sciences de l'environnement de Paris (IEES), and Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)

Subjects
inorganic chemicals, SEMIARID ECOSYSTEMS, 010504 meteorology & atmospheric sciences, Soil biodiversity, Soil biology, [SDV]Life Sciences [q-bio], Soil organic matter stabilization, Soil Science, Land-use regime, Plant Science, SOIL BASAL RESPIRATION, 01 natural sciences, SOIL CARBOHYDRATES, Soil lignin, Ciencias Biológicas, Soil retrogression and degradation, otorhinolaryngologic diseases, Soil ecology, 0105 earth and related environmental sciences, 2. Zero hunger, SOIL LIGNIN, Ecology, Soil carbohydrates, Soil organic matter, LAND-USE REGIME, Semiarid ecosystems, 04 agricultural and veterinary sciences, Soil carbon, 15. Life on land, Plant litter, Bioquímica y Biología Molecular, 13. Climate action, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Environmental science, Soil basal respiration, SOIL ORGANIC MATTER STABILIZATION, sense organs, Soil fertility, CIENCIAS NATURALES Y EXACTAS, psychological phenomena and processes
Abstract

Background and aims Subtropical seasonally dry forestsfrom South America are now experiencing one ofthe highest rates of forest-cover change globally. Thesechanges may affect the dynamics of soil organic carbon(SOC) including long-term stabilization processes, withprofound consequences for the fertility and carbon storageof these ecosystems.Methods In order to explore the effect of different landuseregimes on SOC dynamics, we determined theamount and quality of plant litter, the amount and quality(lignin and carbohydrate content) of SOC, and thesoil basal respiration rates across seasonally dry Chacoforests of Argentina.Results Changes in land-use regimes significantly reducedthe amount of litter but not its quality. As aconsequence, the SOC content was also reduced togetherwith SOC quality. Unexpectedly, we found a higherCO2 release per SOC unit in soils with lower amountand quality of SOC.Conclusions The results presented here show a cleareffect of different land-use regimes on SOC dynamicsthrough a reduction in the amount and quality of SOC.Additionally, we found that potential microbial activityis somehow disconnected from substrate quantity andquality, suggesting that the molecular structure of SOCis not significantly affecting long-term soil stabilizationprocesses across these seasonally-dry ecosystems. Fil: Conti, Georgina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Departamento de Diversidad Biológica y Ecologica; Argentina Fil: Kowaljow, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Departamento de Diversidad Biológica y Ecologica; Argentina Fil: Baptist, Florence. Biotope; Francia Fil: Rumpel, C.. Institut National de la Recherche Agronomique; Francia Fil: Cuchietti, Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Departamento de Diversidad Biológica y Ecologica; Argentina Fil: Pérez Harguindeguy, Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Departamento de Diversidad Biológica y Ecologica; Argentina Fil: Díaz, Sandra Myrna. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Departamento de Diversidad Biológica y Ecologica; Argentina

Published
2016
Full Text
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