López-Ulloa, Magdalena

[["dc.bibliographiccitation.artnumber","1110"],["dc.bibliographiccitation.firstpage","1110"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Soil Science Society of America Journal"],["dc.bibliographiccitation.lastpage","1117"],["dc.bibliographiccitation.volume","69"],["dc.contributor.author","López-Ulloa, M."],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Koning, G. H. J. de"],["dc.date.accessioned","2017-09-07T11:54:56Z"],["dc.date.available","2017-09-07T11:54:56Z"],["dc.date.issued","2005"],["dc.description.abstract","The influence of soil C stabilization mechanisms is normally not considered in studies on the effects of land use changes. Instead, observed changes are typically explained by differences in litter input. As a result, it is not well known if and how quickly newly incorporated C is stabilized in soils. Our goals were to find out how much soil C was stabilized in two different soil orders (Andisols and Inceptisols) and which are the responsible mechanisms of C stabilization. Furthermore, we looked for evidence that newly incorporated soil C was stabilized in these contrasting soil orders. We selected 25 sites in northwestern Ecuador with two paired plots per site: one plot where pasture was converted to secondary forest and one plot where forest was converted to pasture. In all the plots, soil C content, stocks, and stable isotope (δ13C) signal were measured in the surface soil. The δ13C values were used to estimate the stocks of soil C derived from forest (Cdf) and from pasture (Cdp) in all plots. We calculated correlations between these stocks and soil and environmental characteristics to identify mechanisms of soil C stabilization. Our results show that long-term stabilization in Andisols was through formation of metal–humus complexes and allophane, while in Inceptisols long-term stabilization was through sorption to clay minerals. We found evidence that recently incorporated C was not stabilized in Andisols, while in Inceptisols, poorly crystalline (hydr-) oxides seemed to have stabilized part of this soil C. We conclude that unless soil C stabilizing mechanisms are explicitly considered, we will not be able to predict the direction and magnitude of changes in soil C stocks following land use changes in the tropics."],["dc.identifier.doi","10.2136/sssaj2004.0353"],["dc.identifier.gro","3150162"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6895"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1435-0661"],["dc.title","Soil Carbon Stabilization in Converted Tropical Pastures and Forests Depends on Soil Type"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Global Biogeochemical Cycles"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Koning, G. H. J. de"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","López-Ulloa, M."],["dc.date.accessioned","2017-09-07T11:43:33Z"],["dc.date.available","2017-09-07T11:43:33Z"],["dc.date.issued","2003"],["dc.format.extent","12"],["dc.identifier.doi","10.1029/2003gb002099"],["dc.identifier.gro","3150175"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6911"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0886-6236"],["dc.title","Quantification of carbon sequestration in soils following pasture to forest conversion in northwestern Ecuador"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]