Schmidt-Walter, Paul

[["dc.bibliographiccitation.firstpage","207"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Basic and Applied Ecology"],["dc.bibliographiccitation.lastpage","218"],["dc.bibliographiccitation.volume","15"],["dc.contributor.author","Hoeft, Ina"],["dc.contributor.author","Keuter, Andreas"],["dc.contributor.author","Quiñones, Cecille M."],["dc.contributor.author","Schmidt-Walter, Paul"],["dc.contributor.author","Veldkamp, Edzo"],["dc.contributor.author","Corre, Marife D."],["dc.date.accessioned","2017-09-07T11:43:31Z"],["dc.date.available","2017-09-07T11:43:31Z"],["dc.date.issued","2014"],["dc.description.abstract","Maintaining nitrogen retention efficiency (NRE) is crucial in minimizing N losses when intensifying management of temperate grasslands. Our aim was to evaluate how grassland management practices and sward compositions affect NRE (1 − N losses/soil available N), defined as the efficiency with which soil available N is retained in an ecosystem. A three-factorial grassland management experiment was established with two fertilization treatments (without and combined N, phosphorus and potassium fertilization), two mowing frequencies (cut once and thrice per year) and three sward compositions (control, monocot- and dicot-enhanced swards). We measured N losses as leaching and nitrous oxide emissions, and soil available N as gross N mineralization rates. Fertilization increased N losses due to increased nitrification and decreased microbial N immobilization, and consequently decreased NRE. Intensive mowing partly dampened high N losses following fertilization. Sward compositions influenced NRE but not N losses: control swards that developed for decades under extensive management had the highest NRE, whereas monocot-enhanced sward had the lowest NRE. NRE was highly correlated with microbial NH4+ immobilization and microbial biomass and only marginally correlated with plant N uptake, underlining the importance of microbial N retention in the soil-plant system. Microbial N retention is reflected in NRE but not in indices commonly used to reflect plant response. NRE was able to capture the effects of sward composition and fertilization whereas N losses were only sensitive to fertilization; thus, NRE is a better index when evaluating environmental sustainability of sward compositions and management practices of grasslands."],["dc.identifier.doi","10.1016/j.baae.2014.04.001"],["dc.identifier.gro","3150166"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6901"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1439-1791"],["dc.subject","Nitrate leaching; Dissolved organic nitrogen; Nitrous oxide emissions; Gross N mineralization; Microbial immobilization; 15N pool dilution; Functional group diversity"],["dc.title","Nitrogen retention efficiency and nitrogen losses of a managed and phytodiverse temperate grassland"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","621"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","BioEnergy Research"],["dc.bibliographiccitation.lastpage","635"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Langeveld, Hans"],["dc.contributor.author","Quist-Wessel, Foluke"],["dc.contributor.author","Dimitriou, Ioannis"],["dc.contributor.author","Aronsson, Par"],["dc.contributor.author","Baum, Christel"],["dc.contributor.author","Schulz, Ulrich"],["dc.contributor.author","Bolte, Andreas"],["dc.contributor.author","Baum, Sarah"],["dc.contributor.author","Koehn, Joerg"],["dc.contributor.author","Weih, Martin"],["dc.contributor.author","Gruss, Holger"],["dc.contributor.author","Leinweber, Peter"],["dc.contributor.author","Lamersdorf, Norbert P."],["dc.contributor.author","Schmidt-Walter, Paul"],["dc.contributor.author","Berndes, Goran"],["dc.date.accessioned","2018-11-07T09:06:35Z"],["dc.date.available","2018-11-07T09:06:35Z"],["dc.date.issued","2012"],["dc.description.abstract","Short rotation coppice (SRC) systems can play a role as feedstock for bioenergy supply contributing to EU energy and climate policy targets. A scenario depicting intensive arable crop cultivation in a homogeneous landscape (lacking habitat structures) was compared to a scenario including SRC cultivation on 20 % of arable land. A range of indicators was selected to assess the consequences of SRC on soil, water and biodiversity, using data from the Rating-SRC project (Sweden and Germany). The results of the assessment were presented using spider diagrams. Establishment and use of SRC for bioenergy has both positive and negative effects. The former include increased carbon sequestration and reduced GHG emissions as well as reduced soil erosion, groundwater nitrate and surface runoff. SRC can be used in phytoremediation and improves plant and breeding bird biodiversity (exceptions: grassland and arable land species) but should not be applied in dry areas or on soils high in toxic trace elements (exception: cadmium). The scenario-based analysis was found useful for studying the consequences of SRC cultivation at larger scales. Limitations of the approach are related to data requirements and compatibility and its restricted ability to cover spatial diversity and dynamic processes. The findings should not be generalised beyond the representativeness of the data used."],["dc.identifier.doi","10.1007/s12155-012-9235-x"],["dc.identifier.isi","000307983000008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25596"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1939-1234"],["dc.title","Assessing Environmental Impacts of Short Rotation Coppice (SRC) Expansion: Model Definition and Preliminary Results"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","197"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","LANDBAUFORSCHUNG VOLKENRODE"],["dc.bibliographiccitation.lastpage","206"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Dimitriou, Ioannis"],["dc.contributor.author","Busch, Gerald"],["dc.contributor.author","Jacobs, Silvia"],["dc.contributor.author","Schmidt-Walter, Paul"],["dc.contributor.author","Lamersdorf, Norbert P."],["dc.date.accessioned","2018-11-07T11:25:11Z"],["dc.date.available","2018-11-07T11:25:11Z"],["dc.date.issued","2009"],["dc.description.abstract","Cultivation of Short Rotation Coppice (SRC) with poplars (Populus sp.) and willows (Salix sp.) for production of biomass for heat and/or electricity is energy effective and coincides with several environmental objectives. Since an increase of cultivation of poplar and willow SRC has been projected in Europe, the consequent implications on water issues arises. For instance, water use of SRC can be higher compared to annual agricultural crcps or previous set-aside land, but water quality can be improved The paper examines such implications based on a review of the existing scientific literature. Rates of evapotranspiration (V(ET)) of SRC are reported to be fairly higher than arable crops, but reported values vary markedly and are related to site-specific factors such as the local precipitation and conditions (e.g soil type, temperature, groundwater level), the species/sorts and the age of the crop, and their interactions. Despite the predicted local effects on water balances, effects on water balances/hydrology on catchment levels have not been reported or justified This, combined with the reported positive effects of SRC on groundwater quality in terms of nutrient leaching, imoly average positive effects of SRC on water issues, if the identified potentially negative impacts would be considered and minimized. For this, comparisons of V ET between SRC and arable crops, and the relation of V ET with local precipitation and other local factors (root development, groundwater availability) should be better examined and combined with positive effects of SRC on groundwater leaching compared to other crops Upscaling of water issues for SRC is needed to promote future decision-making processes with respect to the envisaged broadening of SRC on productive but also on marginal soils."],["dc.identifier.isi","000271222900005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56573"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Forschungsanstalt Fur Landwirt Braunschweig Volkenrode"],["dc.relation.issn","0458-6859"],["dc.title","A review of the impacts of Short Rotation Coppice cultivation on water issues"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","585"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Der Ophthalmologe"],["dc.bibliographiccitation.lastpage","591"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Feltgen, N."],["dc.contributor.author","Mele, B."],["dc.contributor.author","Dietlein, T."],["dc.contributor.author","Erb, C."],["dc.contributor.author","Eckstein, A."],["dc.contributor.author","Hager, A."],["dc.contributor.author","Heiligenhaus, A."],["dc.contributor.author","Helbig, H."],["dc.contributor.author","Hoerauf, H."],["dc.contributor.author","Hoffmann, E."],["dc.contributor.author","Pauleikhoff, D."],["dc.contributor.author","Schittkowski, M."],["dc.contributor.author","Seitz, B."],["dc.contributor.author","Sucker, C."],["dc.contributor.author","Suffo, S."],["dc.contributor.author","Schaudig, U."],["dc.contributor.author","Tost, F."],["dc.contributor.author","Thurau, S."],["dc.contributor.author","Walter, P."],["dc.contributor.author","Koscielny, J."],["dc.date.accessioned","2020-12-10T14:10:16Z"],["dc.date.available","2020-12-10T14:10:16Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1007/s00347-018-0732-y"],["dc.identifier.eissn","1433-0423"],["dc.identifier.issn","0941-293X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70704"],["dc.language.iso","de"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Umgang mit gerinnungshemmenden Substanzen in der Ophthalmochirurgie – eine Umfrage unter Ophthalmochirurgen in Deutschland"],["dc.title.alternative","Management of anticoagulants in ophthalmic surgery—a survey among ophthalmic surgeons in Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","165"],["dc.bibliographiccitation.journal","Agricultural and Forest Meteorology"],["dc.bibliographiccitation.lastpage","178"],["dc.bibliographiccitation.volume","195"],["dc.contributor.author","Schmidt-Walter, Paul"],["dc.contributor.author","Richter, Falk"],["dc.contributor.author","Herbst, Mathias"],["dc.contributor.author","Schuldt, Bernhard"],["dc.contributor.author","Lamersdorf, Norbert P."],["dc.date.accessioned","2018-11-07T09:35:16Z"],["dc.date.available","2018-11-07T09:35:16Z"],["dc.date.issued","2014"],["dc.description.abstract","In order to evaluate the influence of canopy cover and leaf area on the water use of short rotation coppices (SRC), we measured evapotranspiration and transpiration of a young and a full-grown mature poplar SRC throughout one growing season, using the Bowen-ratio energy balance method and sap flux technique, respectively. The young SRC at Fuhrberg had a sparse though developing canopy reaching a maximum leaf area index (LAI) of 3.8 m(2) m(-2) in August, while the mature SRC at Grossfahner earlier reached maximum LAI at 7.4m(2) m(-2). Despite contrasting canopy densities, growing season total evapotranspiration (Fuhrberg: 380 mm, Grossfahner: 445 mm) and transpiration ratios did not differ substantially, because understorey transpiration and soil evaporation probably compensated low tree transpiration in the first half of the growing season at LAI <3 m(2) m(-2). Mid-season mean daily transpiration on rainless days was 2.34 +/- 0.13 mm d(-1) at Fuhrberg and 3.16 +/- 0.81 at Grossfahner. The values for the full-grown SRC at Grossfahner were in the middle range of reported values for poplar SRCs of comparable LAI and canopy density, and came from efficient stomatal regulation of transpiration, in which poplar clones might differ. Bulk canopy conductance (g(c)), calculated by inverting the Penman-Monteith equation and related to vapor pressure deficit (D), revealed stomatal control of transpiration at the mature plantation, and according to a simple hydraulic model, was sufficient to maintain a minimum leaf water potential at high atmospheric demand. This indicated isohydric behavior and marks a conservative water use strategy, which avoids water stress by limiting transpiration rates at high D and might be typical for the investigated poplar hybrid (J-105). The young plantation exhibited a similar water use strategy, when LAI was above 3 m(2) m(-2). Before canopy closure, the ratio of stomatal sensitivity (m) and reference conductance (g(cref), i.e. g(c) @ D=1 kPa), which are parameters of a logarithmical response curve of g(c) to D, was significantly lower than the theoretical ratio for isohydric responses. This indicates poor stomatal control of water loss and reflected the contribution of understorey-transpiration and soil evaporation to total stand evapotranspiration, which might increase severely at high evaporative demand in sparse poplar stands. (C) 2014 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","European ERA-NET-Bioenergy program"],["dc.identifier.doi","10.1016/j.agrformet.2014.05.006"],["dc.identifier.isi","000339216600016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32349"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1873-2240"],["dc.relation.issn","0168-1923"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Transpiration and water use strategies of a young and a full-grown short rotation coppice differing in canopy cover and leaf area"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","546"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","BioEnergy Research"],["dc.bibliographiccitation.lastpage","562"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Schmidt-Walter, Paul"],["dc.contributor.author","Lamersdorf, Norbert P."],["dc.date.accessioned","2018-11-07T09:06:35Z"],["dc.date.available","2018-11-07T09:06:35Z"],["dc.date.issued","2012"],["dc.description.abstract","In a lowland drinking water catchment area, nitrate leaching as well as groundwater recharge (GWR) was investigated in willow and poplar short rotation coppice (SRC) plantations of different ages, soil preparation measures prior to planting and harvesting intervals. Significantly increased nitrate concentrations of 16.6 +/- 1.6 mg NO3-N L-1 were measured in winter/spring 2010 on a poplar site, established in 2009 after deep plowing (90 cm) but then, subsequently decreased strongly to below 2 mg NO3-N L-1 in spring 2011. The fallow ground reference plot showed nitrate concentrations consistently below 1 mg L-1 and estimated annual seepage output loss was only 1.36 +/- 1.1 kg ha(-1) a(-1). Leaching loss from a neighboring willow plot from 2005 was 14.3 +/- 6.6 kg NO3-N ha(-1) during spring 2010 but decreased to 2.0 +/- 1.5 kg NO3-N ha(-1) during the subsequent drainage period. A second willow plot, not harvested since its establishment in 1994, showed continuously higher nitrate concentrations (10.2 +/- 1.7 NO3-N L-1), while a neighboring poplar plot, twice harvested since 1994 showed significantly reduced nitrate concentrations. Water balance simulations, referenced by soil water tension and throughfall measurements, showed that at 655 mm annual rainfall, GWR from the reference plot (300 mm a(-1)) was reduced by 40 % (to 180 mm a(-1)) on the 2005 willow stand, mainly due to doubled rainfall interception losses. However, transpiration was limited by low soil water storage capacities, which in turn led to a moderate impact on GWR. We conclude that well-managed SRC on sensitive areas can prevent nitrate leaching, while impacts on GWR may be mitigated by management options."],["dc.identifier.doi","10.1007/s12155-012-9237-8"],["dc.identifier.isi","000307983000003"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8884"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25594"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1939-1234"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Biomass Production with Willow and Poplar Short Rotation Coppices on Sensitive Areas-the Impact on Nitrate Leaching and Groundwater Recharge in a Drinking Water Catchment near Hanover, Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]