Veldkamp, Edzo

[["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.firstpage","28047"],["dc.bibliographiccitation.issue","D21"],["dc.bibliographiccitation.journal","Journal of Geophysical Research: Atmospheres"],["dc.bibliographiccitation.lastpage","28058"],["dc.bibliographiccitation.volume","103"],["dc.contributor.author","Weitz, Antje M."],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Keller, M."],["dc.contributor.author","Neff, J. C."],["dc.contributor.author","Crill, P. M."],["dc.date.accessioned","2017-09-07T11:54:55Z"],["dc.date.available","2017-09-07T11:54:55Z"],["dc.date.issued","2004"],["dc.identifier.doi","10.1029/98jd02144"],["dc.identifier.gro","3150146"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6878"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0148-0227"],["dc.title","Nitrous oxide, nitric oxide, and methane fluxes from soils following clearing and burning of tropical secondary forest"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Geoderma"],["dc.bibliographiccitation.lastpage","11"],["dc.bibliographiccitation.volume","138"],["dc.contributor.author","Kleber, Markus"],["dc.contributor.author","Schwendenmann, Luitgard"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Rößner, Jenny"],["dc.contributor.author","Jahn, Reinhold"],["dc.date.accessioned","2017-09-07T11:54:54Z"],["dc.date.available","2017-09-07T11:54:54Z"],["dc.date.issued","2006"],["dc.description.abstract","Halloysite and gibbsite, although known to require quite different conditions for their formation, commonly occur together in the same horizon in oxisols derived from andesitic parent materials in tropical Costa Rica. We selected two soils of similar parent material, but of different ages and soil moisture regimes to identify possible clues to the coexistence of these two minerals. We employed selective dissolution procedures, X-ray fluorescence analysis and X-ray diffraction on field moist and air dry bulk soil samples to investigate how mineralogy changes with depth. We further separated the size fraction < 2 μm by means of sedimentation after organic matter and iron oxide removal to obtain more specific information on the phyllosilicate mineralogy of the clay size fraction.We found both soils to be depleted of primary minerals and pedogenesis to have progressed to advanced weathering stages particularly in the subsoils. Gibbsite XRD signal intensities were linearly and significantly related to weathering indices, corroborating the residual nature of gibbsite as an endproduct of weathering processes. The Si-bearing quartz and kaolinite-group minerals were enriched in the topsoils, indicating (i) their independence from a primary mineral Si source and (ii) the existence of a mechanism capable of protecting them against the continuous tropical weathering pressure. As we found no indications for retrospective additions of soil material through mass movement or aeolian additions, we believe a vegetation dependent, biological pumping mechanism to be the most plausible explanation for the presence of silica bearing minerals in the La Selva topsoils.The vertical distribution of 1.0 nm halloysite and its accumulation in the lower reaches of the wetter alluvial soil suggest that this metastable mineral forms as a result of Si enrichment where the residence time of the pore water is long enough to allow for Si concentrations to exceed the halloysite precipitation threshold. Taken together, our evidence indicates gibbsite in the La Selva soils to be the endproduct of intense tropical weathering, while the presence of hydrated halloysite seems to have mainly kinetic reasons and is most probably coupled to the contemporary soil moisture regime."],["dc.identifier.doi","10.1016/j.geoderma.2006.10.004"],["dc.identifier.gro","3150140"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6871"],["dc.language.iso","en"],["dc.notes.status","public"],["dc.relation.issn","0016-7061"],["dc.subject","Halloysite; Gibbsite; Allophane; X-ray diffraction; Silicon cycling; Tropical soils; Rain forest"],["dc.title","Halloysite versus gibbsite: Silicon cycling as a pedogenetic process in two lowland neotropical rain forest soils of La Selva, Costa Rica"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","123"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","SOIL"],["dc.bibliographiccitation.lastpage","137"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","de Blécourt, Marleen"],["dc.contributor.author","Corre, Marife D."],["dc.contributor.author","Paudel, Ekananda"],["dc.contributor.author","Harrison, Rhett D."],["dc.contributor.author","Brumme, Rainer"],["dc.contributor.author","Veldkamp, Edzo"],["dc.date.accessioned","2020-12-10T18:47:55Z"],["dc.date.available","2020-12-10T18:47:55Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.5194/soil-3-123-2017"],["dc.identifier.eissn","2199-398X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78945"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Spatial variability in soil organic carbon in a tropical montane landscape: associations between soil organic carbon and land use, soil properties, vegetation, and topography vary across plot to landscape scales"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","71"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Land Degradation and Development"],["dc.bibliographiccitation.lastpage","84"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Weitz, Antje M."],["dc.contributor.author","Staritsky, I. G."],["dc.contributor.author","Huising, E. J."],["dc.date.accessioned","2017-09-07T11:43:39Z"],["dc.date.available","2017-09-07T11:43:39Z"],["dc.date.issued","2007"],["dc.identifier.doi","10.1002/ldr.3400030202"],["dc.identifier.gro","3150197"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6935"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","1085-3278"],["dc.title","Deforestation trends in the Atlantic Zone of Costa Rica: A case study"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","315"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Biogeochemistry"],["dc.bibliographiccitation.lastpage","336"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Powers, Jennifer S."],["dc.contributor.author","Veldkamp, Edzo"],["dc.date.accessioned","2017-09-07T11:43:41Z"],["dc.date.available","2017-09-07T11:43:41Z"],["dc.date.issued","2005"],["dc.description.abstract","Recent studies suggest that the direction and magnitude of changes in soil organic carbon (soil C) pools following forest-to-pasture conversion in the tropics are dependent upon initial soil conditions and local factors (e.g. pre-conversion soil C content, soil texture, vegetation productivity, and management practices). The goal of this study was to understand how landscape-scale variation in soil-forming factors influenced the response of soil C pools to forest clearing and pasture establishment in northeastern Costa Rica. We measured soil C and its stable isotopic composition in 24 paired pasture and reference forest sites distributed over large gradients of edaphic characteristics and slope throughout a 1400 km2 region. We used the large difference in stable C isotopic signatures of C3 vegetation (rain forest) versus C4 vegetation (pasture grasses) as a tracer of soil C dynamics. Soil C pools to 30 cm depth ranged from 26% lower to 23% higher in pastures compared to paired forests. The presence of non-crystalline clays and percent slope explained between 27 and 37% of the variation in the direction and magnitude of the changes in soil C storage following pasture establishment. Stable carbon isotopes (δ13C) in the top soil (0–10 cm) showed a rapid incorporation of pasture-derived C following pasture establishment, but the vegetation in these pastures never became pure C4 communities. The amount of forest-derived soil C in pasture topsoils (0–10 cm) was negatively correlated to both pasture age and the concentrations of non-crystalline iron oxides. Together these results imply that site factors such as soil mineralogy are an important control over soil C storage and turnover in this region."],["dc.identifier.doi","10.1007/s10533-004-0368-7"],["dc.identifier.gro","3150210"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6949"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0168-2563"],["dc.subject","Costa Rica; Land-use change; Pasture; Soil carbon; Stable carbon isotopes"],["dc.title","Regional variation in soil carbon and δ13 C in forests and pastures of northeastern Costa Rica"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Agriculture, Ecosystems & Environment"],["dc.bibliographiccitation.lastpage","16"],["dc.bibliographiccitation.volume","108"],["dc.contributor.author","Haileslassie, Amare"],["dc.contributor.author","Priess, Joerg A."],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Teketay, Demil"],["dc.contributor.author","Lesschen, Jan Peter"],["dc.date.accessioned","2017-09-07T11:54:54Z"],["dc.date.available","2017-09-07T11:54:54Z"],["dc.date.issued","2005"],["dc.identifier.doi","10.1016/j.agee.2004.12.010"],["dc.identifier.gro","3150136"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6867"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0167-8809"],["dc.title","Assessment of soil nutrient depletion and its spatial variability on smallholders’ mixed farming systems in Ethiopia using partial versus full nutrient balances"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1493"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","1499"],["dc.bibliographiccitation.volume","33"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Weitz, Antje M."],["dc.contributor.author","Keller, Michael"],["dc.date.accessioned","2017-09-07T11:43:42Z"],["dc.date.available","2017-09-07T11:43:42Z"],["dc.date.issued","2002"],["dc.identifier.doi","10.1016/s0038-0717(01)00060-8"],["dc.identifier.gro","3150203"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6941"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0038-0717"],["dc.title","Management effects on methane fluxes in humid tropical pasture soils"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","244"],["dc.bibliographiccitation.issue","6443"],["dc.bibliographiccitation.journal","Nature"],["dc.bibliographiccitation.lastpage","246"],["dc.bibliographiccitation.volume","365"],["dc.contributor.author","Keller, M."],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Weitz, Antje M."],["dc.contributor.author","Reiners, W. A."],["dc.date.accessioned","2017-09-07T11:43:35Z"],["dc.date.available","2017-09-07T11:43:35Z"],["dc.date.issued","2003"],["dc.identifier.doi","10.1038/365244a0"],["dc.identifier.gro","3150170"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6905"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0028-0836"],["dc.title","Effect of pasture age on soil trace-gas emissions from a deforested area of Costa Rica"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","25913"],["dc.bibliographiccitation.issue","D12"],["dc.bibliographiccitation.journal","Journal of Geophysical Research"],["dc.bibliographiccitation.volume","100"],["dc.contributor.author","Neff, J. C."],["dc.contributor.author","Keller, M."],["dc.contributor.author","Holland, E. A."],["dc.contributor.author","Weitz, David A."],["dc.contributor.author","Veldkamp, Edzo"],["dc.date.accessioned","2017-09-07T11:43:41Z"],["dc.date.available","2017-09-07T11:43:41Z"],["dc.date.issued","2004"],["dc.identifier.doi","10.1029/95jd02027"],["dc.identifier.gro","3150207"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6946"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0148-0227"],["dc.title","Fluxes of nitric oxide from soils following the clearing and burning of a secondary tropical rain forest"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]