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Effects of long-term sewage sludge addition to a calcareous soil on soil organic C fractions and soil functions

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dc.contributor.authorSimoes da Mota, Ana Claudia
dc.contributor.authorBarré, Pierre
dc.contributor.authorBaudin, François
dc.contributor.authorPoch, Rosa María
dc.contributor.authorBruni, Elisa
dc.contributor.authorAntón Sobejano, Rodrigo
dc.contributor.authorEnrique Martín, Alberto
dc.contributor.authorVirto Quecedo, Íñigo
dc.contributor.departmentCienciases_ES
dc.contributor.departmentZientziakeu
dc.contributor.departmentInstitute on Innovation and Sustainable Development in Food Chain - ISFOODen
dc.date.accessioned2024-09-19T13:46:53Z
dc.date.available2024-09-19T13:46:53Z
dc.date.issued2024
dc.date.updated2024-09-19T13:09:13Z
dc.description.abstractSoil organic matter (SOM) is a recognized carbon reservoir and paramount in soil functioning and agrosystems productivity. Different management strategies have been established to enhance SOM in arable soils, and one is the application of exogenous organic matter (EOM). Despite significant efforts in recent years, the consequences of EOM addition on increasing soil organic C (SOC) storage and stability in different pedoclimatic contexts remain incompletely understood. In this study, we evaluated the effect of long-term (28 y) sewage sludge (SS) addition to a calcareous soil supporting rainfed extensive crops in a Mediterranean sub-humid area in terms of SOC stabilization and distribution among functional fractions. To that end, we studied total SOM storage and soil fractions in a long-term experiment comparing 4 different doses of SS with mineral fertilization and no-fertilization controls. We compared the concentration, storage and distribution of C using two different fractionation methods (particulate vs. mineral-associated, defined by granulodensimetric fractionation, and active C vs. stable C defined by Rock-Eval® thermal analysis coupled to the machine learning PARTYsoc v2.0 model) on the tilled layer (0–30 cm). Three soil functioning indicators (crops yield, soil microbial biomass C and aggregate stability) were also quantified. We found that SS application, which slightly increased SOC concentration when SS was added, resulted in a net SOC stock gain only with the highest dose used (80 tons/ha), compared to mineral fertilization, suggesting that most of the C added was mineralized. An uneven response of soil fractions was however detected. The coarsest heavy physical fractions > 250 μm and 50–250 μm in size were the most enriched in their C concentration with SS addition, whereas SOC was mostly accumulated as mineral-associated C in the silt-size (2–50 μm) and the 50–250 μm fractions. Regarding thermal fractionation, SS treatments showed C gains between 57 % and 35 % in the active C pool, compared to mineral fertilization. This can be explained considering that the accumulated SOM in mineral-associated fractions corresponded to mean-residence times in the order of 20–40 years. The consequences on soil functioning indicators were not directly related to the amount of SOC stored in the soil, as the highest SOC gains corresponded to the highest dose, but not the highest yields, and some negative correlations were observed between SOC fractions and soil structural stability and microbial biomass. This can be related to some deleterious effects of excessive SS application reducing yields, the soil biological activity and soil structure, and represents an example of the need to decouple the assessment of soil health from that of SOC storage for certain soil management practices. The overall evaluation of the net consequences of long-term SS application indicated that low doses (10 tons/ha) seem a better choice, as they resulted in the highest efficiency in C incorporation, and in a slightly greater increase in SOC concentration than intermediate doses, and equal yields than mineral fertilization, but did not have the negative effects observed in soil functioning with higher doses.en
dc.description.sponsorshipThis project has received funding from the National Institute for Agricultural and Food Research and Technology [INIA, grant number RTA2017-00088-C03-01], and from the European Union's H2020 research and innovation programme under Marie Sklodowska-Curie [grant agreement No 801586].
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dc.identifier.citationSimões-Mota, A., Barré, P., Baudin, F., Poch, R. M., Bruni, E., Anton, R., Enrique, A., Virto, I. (2024) Effects of long-term sewage sludge addition to a calcareous soil on soil organic C fractions and soil functions. Geoderma, 445, 1-11. https://doi.org/10.1016/j.geoderma.2024.116868.
dc.identifier.doi10.1016/j.geoderma.2024.116868
dc.identifier.issn0016-7061
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/51663
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofGeoderma 445, 2024, 116868
dc.relation.projectIDinfo:eu-repo/grantAgreement/European Commission/Horizon 2020 Framework Programme/801586
dc.relation.projectIDinfo:eu-repo/grantAgreement/AEI//RTA2017-00088-C03-01
dc.relation.publisherversionhttps://doi.org/10.1016/j.geoderma.2024.116868
dc.rights© 2024 The Author(s). This is an open access article under the CC BY-NC-ND license
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectCalcareous soilsen
dc.subjectOrganic matter fractionationen
dc.subjectRock-Eval®en
dc.subjectSewage sludgeen
dc.subjectSoil organic Cen
dc.titleEffects of long-term sewage sludge addition to a calcareous soil on soil organic C fractions and soil functionsen
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
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relation.isAuthorOfPublication234e884d-33c7-488e-b1ca-0319926c2819
relation.isAuthorOfPublication53c4e0ea-0230-4409-9301-b6237b5c7ea3
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relation.isAuthorOfPublication.latestForDiscoverycbe19794-2d7d-4296-9376-d1b29f33a62b

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