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Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter

Rodeghiero, Mirco ; Churkina, Galina ; Martinez, Cristina ; Scholten, Thomas ; Gianelle, Damiano ; Cescatti, Alessandro

Plant and soil, 2013-03, Vol.364 (1-2), p.55-68 [Periódico revisado por pares]

Dordrecht: Springer Netherlands

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Título:
Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter
Autor: Rodeghiero, Mirco ; Churkina, Galina ; Martinez, Cristina ; Scholten, Thomas ; Gianelle, Damiano ; Cescatti, Alessandro
Assuntos: Agronomy. Soil science and plant productions ; Animal and plant ecology ; Animal, plant and microbial ecology ; Biochemistry and biology ; Biological and medical sciences ; Biomedical and Life Sciences ; Chemical, physicochemical, biochemical and biological properties ; Ecology ; Fundamental and applied biological sciences. Psychology ; General agronomy. Plant production ; Life Sciences ; Organic matter ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; Plant Physiology ; Plant Sciences ; Regular Article ; Soil science ; Soil Science & Conservation ; Soil-plant relationships. Soil fertility ; Soil-plant relationships. Soil fertility. Fertilization. Amendments ; Synecology
É parte de: Plant and soil, 2013-03, Vol.364 (1-2), p.55-68
Descrição: Aims The partitioning of the total soil CO 2 efflux into its two main components: respiration from roots (and root-associated organisms) and microbial respiration (by means of soil organic matter (SOM) and litter decomposition), is a major need in soil carbon dynamics studies in order to understand if a soil is a net sink or source of carbon. Methods The heterotrophic component of the CO 2 efflux was estimated for 11 forest sites as the ratio between the carbon stocks of different SOM pools and previously published (Δ 14 C derived) turnover times. The autotrophic component, including root and root-associated respiration, was calculated by subtracting the heterotrophic component from total soil chamber measured CO 2 efflux. Results Results suggested that, on average, 50.4 % of total soil CO 2 efflux was derived from the respiration of the living roots, 42.4 % from decomposition of the litter layers and less than 10 % from decomposition of belowground SOM. Conclusions The Δ 14 C method proved to be an efficient tool by which to partition soil CO 2 efflux and quantify the contribution of the different components of soil respiration. However the average calculated heterotrophic respiration was statistically lower compared with two previous studies dealing with soil CO 2 efflux partitioning (one performed in the same study area; the other a meta-analysis of soil respiration partitioning). These differences were probably due to the heterogeneity of the SOM fraction and to a sub-optimal choice of the litter sampling period.
Editor: Dordrecht: Springer Netherlands
Idioma: Inglês

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Components of forest soil CO2 efflux estimated from Δ14C values of soil organic matter

Rodeghiero, Mirco ; Churkina, Galina ; Martinez, Cristina ; Scholten, Thomas ; Gianelle, Damiano ; Cescatti, Alessandro

Dordrecht: Springer Netherlands

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