Prenzel, Jürgen

[["dc.bibliographiccitation.journal","Journal of Environmental Quality"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Prenzel, Jürgen"],["dc.date.accessioned","2021-11-04T21:37:58Z"],["dc.date.available","2021-11-04T21:37:58Z"],["dc.date.issued","1994"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/92749"],["dc.language.iso","en"],["dc.title","Sulfate sorption in soils under acid deposition : comparison of two modeling approaches"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","447"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Journal of plant nutrition and soil science"],["dc.bibliographiccitation.lastpage","454"],["dc.bibliographiccitation.volume","160"],["dc.contributor.author","Ludwig, Bernard"],["dc.contributor.author","Hölscher, Dirk"],["dc.contributor.author","Khanna, Partap"],["dc.contributor.author","Prenzel, Jürgen"],["dc.contributor.author","Fölster, Horst"],["dc.date.accessioned","2017-09-07T11:45:46Z"],["dc.date.available","2017-09-07T11:45:46Z"],["dc.date.issued","1997"],["dc.description.abstract","The results of physico-chemical investigations of an Ultisol subsoil under a 2-year old fallow in eastern Amazonia are presented. Subsoil chemistry was studied using 4 different approaches: i) concentrations of H, Na, K, Ca, Mg, Mn, Al, and Fe in seepage water were measured under field conditions, ii) the equilibrium soil chemistry was studied in sequential batch experiments where the soil was treated with different solutions, iii) results of batch experiments were simulated with a chemical equilibrium model, and iv) the seepage data were calculated using selectivity coefficients obtained by modelling the batch experiments. The model included multiple cation exchange, precipitation/dissolution of Al(OH)3 and inorganic complexation. Cation selectivity coefficients were pKx/Casel: X = Na: 0.3, K: 0.8, Mg: −0.1, and Al: 0.4. The amount of cations sorbed ranged from −0.2 to 2.0 (K), −0.7 to 2.3 (Mg), −1.6 to 1.8 (Ca), −4.8 to 3.6 (Al) and 0.0 to 8.5 (Na) mmolc kg−1. The model predictions were good with values lying within 0.3 pH units (for the pH range 3.7 to 7.2), and 3% of CEC for individual cations. The most important proton buffer reaction seemed to be the dissolution of gibbsite and a large release of Al into the soil solution. When selectivity coefficients obtained by the modelling procedure were used to predict the field data for cation concentrations in the seepage water, they decreased in the following order: Na > K > Ca > Mg > Al. These calculated values were similar to the measured order: Na > Ca > K ≈ Mg > Al. Thus the options for managing these soils should be carefully chosen to avoid soil acidification which may result from inappropriate use of fertilizer during the cropping period."],["dc.identifier.doi","10.1002/jpln.19971600403"],["dc.identifier.gro","3149090"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5737"],["dc.language.iso","en"],["dc.notes.intern","Hoelscher Crossref import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0044-3263"],["dc.title","Modelling of sorption experiments and seepage data of an Amazonian Ultisol subsoil under cropping fallow"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","87"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Geochemical Exploration"],["dc.bibliographiccitation.lastpage","95"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Ludwig, B."],["dc.contributor.author","Prenzel, J."],["dc.contributor.author","Obermann, P."],["dc.date.accessioned","2018-11-07T08:36:05Z"],["dc.date.available","2018-11-07T08:36:05Z"],["dc.date.issued","2001"],["dc.description.abstract","Secondary reactions occurring in pyrite-containing sediments from open cut coal mines are complex and not fully understood. In this study, the changes in seepage water composition in a column experiment with a sediment containing pyrite (5.6 g kg(-1)) were evaluated using a chemical equilibrium model. A column experiment with artificial irrigation (730 mm water yr(-1)) was carried out for 2 yr with a sediment from the open pit mine Garzweiler, Germany, at the Institute of Applied Geology. Tracer (LiCl) was added to the sediment. Seepage water composition at 52 cm depth was sampled weekly. Redox potential and the water potential were also recorded weekly. Sulphate and Fe(II) were the dominant ions in the seepage water with concentration maxima of 500 and 350 mmol l(-1) after 50 days (0.7 pore volumes (PV)). Minimum pH values were around 0.8 after 100 days (1.4 PV), but increased subsequently and reached 2.4 after 700 days (9.5 PV). Ion activity product calculations indicated the intermediate formation of gypsum (19th-480th day of the experiment). Solutions were undersaturated with respect to alunite, jarosite, jurbanite, schwertmannite, melanterite, gibbsite and goethite during the whole experiment. The model of coupled equilibria which included inorganic complexation, precipitation/dissolution of gypsum and multiple cation exchange was tested. Pyrite oxidation and pH-dependent silicate weathering were considered using simple input functions. Transport was modelled using a field capacity cascade submodel. Model results showed satisfactory agreement with measured values for pH and concentrations of SO4, Fe, Mg, Ca and Al. Correlation coefficients lay between 0.7 and 0.9 and linear regression coefficients (modelled against measured) were 1.5 (Ca), 1.0 (Fe, SO4), 0.8 (Mg), 0.7 (pH) and 0.6 (Al). The results showed that the protons produced during pyrite oxidation (94 mmol(c) H+ kg(-1)) were mainly released into seepage water (as HSO4- and H+). Cation exchange reactions buffered 20 mmol, of H+ kg(-1) sediment, and Al released by silicate weathering accounted for 3.6 mmol, H+ kg(-1). Modelling was useful to further understand the significance of different pH buffer reactions. (C) 2001 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0375-6742(01)00190-X"],["dc.identifier.isi","000171650900004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18227"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","International Symposium on the Ecology of Post-Mining Landscapes"],["dc.relation.eventlocation","BRANDENBURG UNIV TCHNOL, COTTBUS, GERMANY"],["dc.relation.issn","0375-6742"],["dc.title","Modelling ion composition in seepage water from a column experiment with an open cut coal mine sediment"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","48"],["dc.bibliographiccitation.journal","Ecological Modelling"],["dc.bibliographiccitation.lastpage","65"],["dc.bibliographiccitation.volume","307"],["dc.contributor.author","Nietfeld, H."],["dc.contributor.author","Prenzel, J."],["dc.date.accessioned","2018-11-07T09:54:40Z"],["dc.date.available","2018-11-07T09:54:40Z"],["dc.date.issued","2015"],["dc.description.abstract","Trees growing in acid soils often suffer from nutrient imbalances and inadequate supply of base cations (M-b) but correlations between soil chemical conditions and nutritional status of forest trees are often inconclusive. Therefore, there is a need of studies that assess the M-b acquisition potential of the absorbing fine roots from the rhizosphere soil. Previous rhizosphere models, mostly implemented as a single-ion model (SIM), calculate the actual root nutrient uptake rates. But SIM often fail to reproduce measurements which is interpreted as being caused by root-induced ionic interactions. Hence, a multi-ion model (MIM) is presented which simultaneously describes the rhizospheric dynamics of H+, Al3+, Ca2+, Mg2+, K+, Na+, NH4+, NO3-, SO42-, H2PO4- and Cl- which takes into account interactions among the ions involved. In MIM the ion diffusion transport is modeled via the Nernst-Planck equation. A root-induced constant or daily-patterned water flux is assumed. The cation sorption is defined according to the cation selectivity approach. Al-solution complexes and a kinetic expression of the dissolution or precipitation of Al(OH)(3)(s) (gibbsite) are included in MIM. The selective nutrient root uptake is balanced by the excretion of H+ (cation uptake excess) or OH- (anion uptake excess) ions. These model features guarantee electro neutrality in the rhizosphere system but lead to ionic interactions. The objectives of this study are to calculate the rhizospheric gradients of protons, Al3+ ions and base cations (M-b), their concentration changes at the root surface (RS) and in rhizospheric sub-volumes termed as soil-root interface (SRI) and inner rhizosphere (Rh). It is hypothesized that root-induced changes of pH and the pH-dependent dissolution or precipitation of Al(OH)(3)(s) affect the rhizospheric concentration gradients and the actual root uptake rates (U-Mb) of M-b cations. In various scenarios the hypothesis is tested on the basis of different ion concentrations in the bulk soil and root uptake capacities of nitrogen and M-b ions. The simulations demonstrate that the rates of root excretions as H+ or OH- ions are determined by the preferential nitrogen root uptake as NH4+ or NO3-, respectively. A high NH4+, root uptake leads to a decrease of rhizospheric pH and a dissolution of Al(OH)(3)(s). An accumulation of Al3+ cations in solution and exchanger mostly on RS and in SRI is calculated due to water flux and Al(OH)(3)(s)-dissolution. Accumulation of exchangeable Al3+ cations cause an enhanced desorption of M-b cations in SRI if compared with SIM-results and lead to a M-b concentration increase in Rh-solution and a RS-depletion for Ca2+ and K+. MIM-calculated U-Mb are slightly higher compared with SIM-calculated U-Mb. A high NO3- root uptake leads to a rhizospheric pH increase, a depletion of Al3+ in rhizospheric solution and exchanger also at water flux caused by an Al(OH)(3)(s)-formation, an accumulation of exchangeable M-b cations mainly in SRI, a M-b-depletion in rhizospheric soil solution and to significantly lower U-Mb if compared with SIM-results. Al(OH)(3)(s)-induced differences in rhizospheric M-b gradients and U-Mb-values are determined by the magnitude of the H+/OH- root excretion rates, are highest at low M-b solution concentrations, and also occur in extremely low Al3+ bulk soil solution concentrations. An Al(OH)(3)(s)-formation may be inhibited at high Al3+ bulk soil solution concentrations and high H+-concentrations in solution and exchanger of the bulk soil. The range of calculated M-b depletions and accumulations in SRI and Rh correspond to the measurement results reported in the literature. It is concluded that, in contrast to SIM, MIM-simulations present asynchronous ion concentration gradients in soil solution and exchanger which include opposite concentration gradients. At NO3- surplus a high NO3- root uptake and a low availability of M-b cations may lead to wide NO3-:M-b root uptake ratios and tree nutrient imbalances. (c) 2015 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.ecolmodel.2015.02.011"],["dc.identifier.isi","000355709500005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36586"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","1872-7026"],["dc.relation.issn","0304-3800"],["dc.title","Modeling the reactive ion dynamics in the rhizosphere of tree roots growing in acid soils. I. Rhizospheric distribution patterns and root uptake of M-b cations as affected by root-induced pH and Al dynamics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Geoderma"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Prenzel, Jürgen"],["dc.contributor.author","Schulte-Bisping, Hubert"],["dc.date.accessioned","2021-11-04T21:18:59Z"],["dc.date.available","2021-11-04T21:18:59Z"],["dc.date.issued","1995"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/92747"],["dc.language.iso","en"],["dc.title","Some chemical parameter relations in a population of German forest soils"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Prenzel, Jürgen"],["dc.contributor.editor","Ulrich, B."],["dc.contributor.editor","Pankrath, J."],["dc.date.accessioned","2021-11-04T21:34:47Z"],["dc.date.available","2021-11-04T21:34:47Z"],["dc.date.issued","1983"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/92748"],["dc.language.iso","en"],["dc.publisher","Springer"],["dc.publisher.place","Effects of Accumulation of Air Pollutants in Forest Ecosystems"],["dc.relation.ispartof","Effects of Accumulation of Air Pollutants in Forest Ecosystems"],["dc.title","A Mechanism for Storage and Retrieval of Acid in Acid Soils"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1055"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Waste Management"],["dc.bibliographiccitation.lastpage","1066"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Ludwig, Bernard"],["dc.contributor.author","Khanna, Partap"],["dc.contributor.author","Prenzel, Jürgen"],["dc.contributor.author","Beese, Friedrich"],["dc.date.accessioned","2018-11-07T08:49:12Z"],["dc.date.available","2018-11-07T08:49:12Z"],["dc.date.issued","2005"],["dc.description.abstract","Most ashes contain a significant amount of heavy metals and when released from disposed or used ash materials, they can form a major environmental concern for underground waters. The use of water extracts to assess the easily mobilisable content of heavy metals may not provide an appropriate measure. This study describes the patterns of heavy metal release from ash materials in context with results from the German standard extraction method DIN-S4 (DIN 38 414 S4). Samples of four different ashes (municipal solid waste incineration ash, wood ash, brown coal ash and hard coal ash) were subjected to a number of serial batch tests with liquid renewal, some of which involved the addition of acid to neutralize carbonates and oxides. Release of heavy metals showed different patterns depending on the element, the type of material, the method of extraction and the type of the extractant used. Only a small fraction of the total heavy metal contents occurred as water soluble salts; of special significance was the amount of Cr released from the wood ash. The reaction time (1, 24 or 72 h between each extraction step with water) had only a small effect on the release of heavy metals. However, the release of most of the heavy metals was governed by the dissolution processes following proton inputs, indicating that pH-dependent tests such as CEN TC 292 or others are required to estimate long-term effects of heavy metal releases from ashes. Based on the chemical characteristics of ash materials in terms of their form and so] ability of heavy metals, recommendations were made on the disposal or use of the four ash materials. (c) 2005 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.wasman.2005.01.007"],["dc.identifier.isi","000233176100008"],["dc.identifier.pmid","15979297"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21402"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0956-053X"],["dc.title","Heavy metal release from different ashes during serial batch tests using water and acid"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Inorganic Biochemistry"],["dc.bibliographiccitation.volume","86"],["dc.contributor.author","Ludwig, Bernard"],["dc.contributor.author","Khanna, P."],["dc.contributor.author","Prenzel, J."],["dc.date.accessioned","2018-11-07T08:49:26Z"],["dc.date.available","2018-11-07T08:49:26Z"],["dc.date.issued","2001"],["dc.format.extent","68"],["dc.identifier.isi","000170467300613"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21455"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Inc"],["dc.publisher.place","New york"],["dc.relation.issn","0162-0134"],["dc.title","Modelling environmentally important chemical processes in soils"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1659"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","1667"],["dc.bibliographiccitation.volume","41"],["dc.contributor.author","Guckland, Anja"],["dc.contributor.author","Flessa, H."],["dc.contributor.author","Prenzel, J."],["dc.date.accessioned","2018-11-07T08:27:35Z"],["dc.date.available","2018-11-07T08:27:35Z"],["dc.date.issued","2009"],["dc.description.abstract","Aerated forest soils are a significant sink for atmospheric methane (CH(4)). Soil properties, local climate and tree species can affect the soil CH(4) sink. A two-year field study was conducted in a deciduous mixed forest in the Hainich National Park in Germany to quantify the sink strength of this forest for atmospheric CH(4) and to determine the key factors that control the seasonal, annual and spatial variability of CH(4) uptake by soils in this forest. Net exchange of CH(4) was measured using closed chambers on 18 plots in three stands exhibiting different beech (Fagus sylvatica L) abundance and which differed in soil acidity, soil texture, and organic layer thickness. The annual CH(4) uptake ranged from 2.0 to 3.4 kg CH(4)-C ha(-1). The variation of CH(4) uptake over time could be explained to a large extent (R(2) = 0.71, P < 0.001) by changes in soil moisture in the upper 5 cm of the mineral soil. Differences of the annual CH(4) uptake between sites were primarily caused by the spatial variability of the soil clay content at a depth of 0-5 cm (R(2) = 0.5, P < 0.01). The CH(4) uptake during the main growing period (May-September) increased considerably with decreasing precipitation rate. Low CH(4) uptake activity during winter was further reduced by periods with soil frost and snow cover. There was no evidence of a significant effect of soil acidity, soil nutrient availability, thickness of the humus layer or abundance of beech on net-CH(4) uptake in soils in this deciduous forest. The results show that detailed information on the spatial distribution of the clay content in the upper mineral soil is necessary for a reliable larger scale estimate of the CH(4) sink strength in this mixed deciduous forest. The results suggest that climate change will result in increasing CH(4) uptake rates in this region because of the trend to drier summers and warmer winters. (C) 2009 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [1086]"],["dc.identifier.doi","10.1016/j.soilbio.2009.05.006"],["dc.identifier.isi","000268920400009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16237"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","Controls of temporal and spatial variability of methane uptake in soils of a temperate deciduous forest with different abundance of European beech (Fagus sylvatica L.)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","150"],["dc.bibliographiccitation.journal","Ecological Modelling"],["dc.bibliographiccitation.lastpage","164"],["dc.bibliographiccitation.volume","345"],["dc.contributor.author","Nietfeld, H."],["dc.contributor.author","Prenzel, J."],["dc.contributor.author","Helmisaari, H.-S."],["dc.contributor.author","Polle, A."],["dc.contributor.author","Beese, F."],["dc.date.accessioned","2018-02-22T11:08:25Z"],["dc.date.available","2018-02-22T11:08:25Z"],["dc.date.issued","2017"],["dc.description.abstract","The effects of acid soil conditions on mineral nutrition and growth of forest trees are discussed controversially. It is hypothesized that approaches are needed which determine the root nutrient uptake rates as affected by root-induced processes in the rhizosphere. A multi-ion rhizosphere model (MIM) has been developed which calculates the reactive dynamics of all major ions (H+, Al3+, Mn2+, Fe3+, Ca2+, Mg2+, K+, Na+, NO3−, SO42− and Cl−) in the rhizosphere of forest tree roots growing in acid soils. MIM calculates fine-scaled ion concentration gradients extending from the unrooted bulk soil (Bulk) to the root surface (RS) and the temporal dynamics of the average concentrations in rhizospheric sub-volumes termed as soil-root-interface (SRI), inner rhizosphere (Rh) and outer rhizosphere (oRh) of all ions (Mi) involved. SRI, Rh and oRh are defined as cylindrical soil volumes around the root which have distances to the root surface of 0.5 mm, 2.0 mm and 8–12 mm, respectively. The SRI-to-Bulk, Rh-to-Bulk and Rh-to-oRh ion concentration ratios (, , ) and the actual rates of root nutrient uptake () and H+ or OH− root excretion (EH/OH) are determined. The model is used in a Monte Carlo upscaling-procedure to calculate the - and EH/OH-rates of non-mycorrhizal long roots of spruce trees growing on a long-term monitoring plot in Solling, Germany. The objectives of this study are (i) to show the plot-specific heterogeneity of modeled - and -values of H+, base cations (Ca2+, Mg2+, K+; Mb-cations), NO3− and SO42−, to present a comparison with rhizospheric measurement data and, to model the and EH/OH rates and (ii) to present the impact of major influencing processes. The -data comprise a range of about 0.5 up to 3.0 and more depending on the ion considered. In an equivalence-testing the modeled -ratios of Ca2+, SO42−, Fe3+ and Na+ agree with corresponding ratios () of measured concentrations in Rh and oRh if extreme -values are neglected. Means of modeled -rates are 0.27, 0.126, 0.09, 1.09 and 0.12 mmol m−2 d−1 for Ca2+, Mg2+, K+, NO3− and SO42−, respectively. The -rates are determined by root uptake capacities (), height of water fluxes, Mb concentrations in bulk and rhizosphere soil, amounts of desorbed exchangeable Mb cations and EH/OH-rates. In most calculations OH− root excretions (EOH) have been calculated. Low -rates have been calculated at low water fluxes and low bulk soil solution concentrations even at high -values and are associated with EOH-rates. Based on the -rates an assessment of the contribution of long roots on the total annual nutrient uptake of the spruce stand is given. It is concluded that the measured proceeding reduction of Mb-solution concentrations and the prospective NO3− saturation in the bulk soil of the spruce plot will lead to extreme low Mb/NO3 root uptake ratios."],["dc.identifier.doi","10.1016/j.ecolmodel.2016.09.006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12426"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Modeling of mineral nutrient uptake of spruce tree roots as affected by the ion dynamics in the rhizosphere"],["dc.title.subtitle","Upscaling of model results to field plot scale"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]