Veldkamp, Edzo

[["dc.bibliographiccitation.artnumber","e47128"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Homeier, Jürgen"],["dc.contributor.author","Hertel, Dietrich"],["dc.contributor.author","Camenzind, Tessa"],["dc.contributor.author","Cumbicus, Nixon L."],["dc.contributor.author","Maraun, Mark"],["dc.contributor.author","Martinson, Guntars O."],["dc.contributor.author","Poma, L. Nohemy"],["dc.contributor.author","Rillig, Matthias C."],["dc.contributor.author","Sandmann, Dorothee"],["dc.contributor.author","Scheu, Stefan"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Wilcke, Wolfgang"],["dc.contributor.author","Wullaert, Hans"],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.editor","Chen, Han Y. H."],["dc.date.accessioned","2017-09-07T11:54:53Z"],["dc.date.available","2017-09-07T11:54:53Z"],["dc.date.issued","2012"],["dc.description.abstract","Tropical regions are facing increasing atmospheric inputs of nutrients, which will have unknown consequences for the structure and functioning of these systems. Here, we show that Neotropical montane rainforests respond rapidly to moderate additions of N (50 kg ha(-1) yr(-1)) and P (10 kg ha(-1) yr(-1)). Monitoring of nutrient fluxes demonstrated that the majority of added nutrients remained in the system, in either soil or vegetation. N and P additions led to not only an increase in foliar N and P concentrations, but also altered soil microbial biomass, standing fine root biomass, stem growth, and litterfall. The different effects suggest that trees are primarily limited by P, whereas some processes-notably aboveground productivity--are limited by both N and P. Highly variable and partly contrasting responses of different tree species suggest marked changes in species composition and diversity of these forests by nutrient inputs in the long term. The unexpectedly fast response of the ecosystem to moderate nutrient additions suggests high vulnerability of tropical montane forests to the expected increase in nutrient inputs."],["dc.identifier.doi","10.1371/journal.pone.0047128"],["dc.identifier.gro","3150124"],["dc.identifier.pmid","23071734"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8325"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6854"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 2.5"],["dc.rights.uri","https://creativecommons.org/licenses/by/2.5"],["dc.title","Tropical Andean Forests Are Highly Susceptible to Nutrient Inputs—Rapid Effects of Experimental N and P Addition to an Ecuadorian Montane Forest"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["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","6318"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Proceedings of the National Academy of Sciences"],["dc.bibliographiccitation.lastpage","6322"],["dc.bibliographiccitation.volume","108"],["dc.contributor.author","Powers, J. S."],["dc.contributor.author","Corre, Marife D."],["dc.contributor.author","Twine, T. E."],["dc.contributor.author","Veldkamp, Edzo"],["dc.date.accessioned","2017-09-07T11:43:34Z"],["dc.date.available","2017-09-07T11:43:34Z"],["dc.date.issued","2011"],["dc.identifier.doi","10.1073/pnas.1016774108"],["dc.identifier.gro","3150178"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7064"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6914"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0027-8424"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Geographic bias of field observations of soil carbon stocks with tropical land-use changes precludes spatial extrapolation"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dc.type.version","submitted_version"],["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","175"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","187"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Wick, Barbara"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Mello, W. Z. de"],["dc.contributor.author","Keller, M."],["dc.contributor.author","Crill, P."],["dc.date.accessioned","2017-09-07T11:54:55Z"],["dc.date.available","2017-09-07T11:54:55Z"],["dc.date.issued","2005"],["dc.description.abstract","We studied nitrous oxide (N2O) fluxes and soil nitrogen (N) cycling following forest conversion to pasture in the central Amazon near Santarém, Parö, Brazil. Two undisturbed forest sites and 27 pasture sites of 0.5 to 60 years were sampled once each during wet and dry seasons. In addition to soil-atmosphere fluxes of N2O we measured 27 soil chemical, soil microbiological and soil physical variables. Soil N2O fluxes were higher in the wet season than in the dry season. Fluxes of N2O from forest soils always exceeded fluxes from pasture soils and showed no consistent trend with pasture age. At our forest sites, nitrate was the dominant form of inorganic N both during wet and dry season. At our pasture sites nitrate generally dominated the inorganic N pools during the wet season and ammonium dominated during the dry season. Net mineralization and nitrification rates displayed large variations. During the dry season net immobilization of N was observed in some pastures. Compared to forest sites, young pasture sites (=2 years) had low microbial biomass N and protease activities. Protease activity and microbial biomass N peaked in pastures of intermediate age (4 to 8 years) followed by consistently lower values in older pasture (10 to 60 years). The C/N ratio of litter was low at the forest sites (~25) and rapidly increased with pasture age reaching values of 60-70 at pastures of 15 years and older. Nitrous oxide emissions at our sites were controlled by C and N availability and soil aeration. Fluxes of N2O were negatively correlated to leaf litter C/N ratio, NH4+-N and the ratio of NO3--N to the sum of NO3--N + NH4+-N (indicators of N availability), and methane fluxes and bulk density (indicators of soil aeration status) during the wet season. During the dry season fluxes of N2O were positively correlated to microbial biomass N, ß-glucosidase activity, total inorganic N stocks and NH4+-N. In our study region, pastures of all age emitted less N2O than old-growth forests, because of a progressive decline in N availability with pasture age combined with strongly anaerobic conditions in some pastures during the wet season."],["dc.format.mimetype","application/pdf"],["dc.identifier.doi","10.5194/bg-2-175-2005"],["dc.identifier.fs","31887"],["dc.identifier.gro","3150148"],["dc.identifier.ppn","571568653"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4418"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6880"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.notes.status","zu prüfen"],["dc.relation.issn","1726-4189"],["dc.rights","Goescholar"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","577"],["dc.title","Nitrous oxide fluxes and nitrogen cycling along a pasture chronosequence in Central Amazonia, Brazil"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["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"]]