Ahrends, Bernd

[["dc.bibliographiccitation.firstpage","80"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Open Geography Journal"],["dc.bibliographiccitation.lastpage","90"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Panferov, O."],["dc.contributor.author","Sogachev, A."],["dc.contributor.author","Ahrends, B."],["dc.date.accessioned","2019-07-09T11:53:11Z"],["dc.date.available","2019-07-09T11:53:11Z"],["dc.date.issued","2010"],["dc.description.abstract","The structure of forests stands changes continuously as a result of forest growth and both natural and anthropogenic disturbances like windthrow or management activities – planting/cutting of trees. These structure changes can stabilize or destabilize forest stands in terms of their resistance to wind damage. The driving force behind the damage is the climate, but the magnitude and sign of resulting effect depend on tree species, management method and soil conditions. The projected increasing frequency of weather extremes in the whole and severe storms in particular might produce wide area damage in European forest ecosystems during the 21st century. To assess the possible wind damage and stabilization/destabilization effects of forest management a number of numeric experiments are carried out for the region of Solling, Germany. The coupled small-scale process-based model combining Brook90 [1] and SCAlar DIStribuiton turbulence model [2-4] is implemented. The SRES climate scenarios A1B and B1 dynamically downscaled by Climate Local Model CLM [5] are used to project the future climate conditions in the area. The experiments are performed for two tree species (spruce and beech) and a mixed stand and for two target diameter harvesting scenarios. The results show considerable increment of wind damage risks towards 2100 compared to “present climate conditions”, caused by the combination of weak increase of wind speed and precipitation and strong increase of air and soil temperature. The effect is stronger for coniferous species than for deciduous ones. It is shown that management activities have a strong destabilizing effect on forests due to joint influence of climatic factors and decrease of stand density."],["dc.identifier.doi","10.2174/1874923201003010080"],["dc.identifier.fs","579284"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6977"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60359"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1874-9232"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","610"],["dc.title","Changes of Forest Stands Vulnerability to Future Wind Damage Resulting from Different Management Methods"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Frontiers in Forests and Global Change"],["dc.bibliographiccitation.volume","3"],["dc.contributor.affiliation","Ahrends, Bernd; 1Department of Environmental Control, Northwest German Forest Research Institute (NW-FVA), Göttingen, Germany"],["dc.contributor.affiliation","Schmitz, Andreas; 2Thünen Institute of Forest Ecosystems, Eberswalde, Germany"],["dc.contributor.affiliation","Prescher, Anne-Katrin; 2Thünen Institute of Forest Ecosystems, Eberswalde, Germany"],["dc.contributor.affiliation","Wehberg, Jan; 5Institute of Geography, University of Hamburg, Hamburg, Germany"],["dc.contributor.affiliation","Geupel, Markus; 6German Environment Agency, Dessau-Roßlau, Germany"],["dc.contributor.affiliation","Andreae, Henning; 7Public Enterprise Sachsenforst, Pirna, Germany"],["dc.contributor.affiliation","Meesenburg, Henning; 1Department of Environmental Control, Northwest German Forest Research Institute (NW-FVA), Göttingen, Germany"],["dc.contributor.author","Ahrends, Bernd"],["dc.contributor.author","Schmitz, Andreas"],["dc.contributor.author","Prescher, Anne-Katrin"],["dc.contributor.author","Wehberg, Jan"],["dc.contributor.author","Geupel, Markus"],["dc.contributor.author","Andreae, Henning"],["dc.contributor.author","Meesenburg, Henning"],["dc.date.accessioned","2022-09-06T06:44:32Z"],["dc.date.available","2022-09-06T06:44:32Z"],["dc.date.issued","2020-09-16"],["dc.date.updated","2022-09-06T06:10:53Z"],["dc.description.abstract","A reliable quantification of total inorganic nitrogen (TIN) deposition to forests is required for the evaluation of ecological effects of TIN inputs to forests and to monitor the success of clean-air policy. As direct measurements are scarce, different modeling approaches have been developed to estimate TIN deposition to forests. Three common methods are the (i) “canopy budget model,” (ii) “inferential method,” and (iii) “emission based estimates” using a chemical transport model. Previous studies have reported considerable and site-specific differences between these methods, complicating the interpretation of results. We use data from more than 100 German intensive forest monitoring sites over a period of 16 years for a cross-comparison of these approaches. Non-linear mixed-effect models were applied to evaluate how factors like meteorology, terrain and stand characteristics affect discrepancies between the model approaches. Taking into account the uncertainties in deposition estimates, there is a good agreement between the canopy budget and the inferential method when using semi-empirical correction factors for deposition velocity. Wet deposition estimates of the emission based approach were in good agreement with wet-only corrected bulk open field deposition measurements used by the other two approaches. High precipitation amounts partly explained remaining differences in wet deposition. Larger discrepancies were observed when dry deposition estimates are compared between the emissions based approach and the other two approaches, which appear to be related to a combination of meteorological conditions and tree species effects."],["dc.identifier.doi","10.3389/ffgc.2020.00103"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/114150"],["dc.language.iso","en"],["dc.relation.eissn","2624-893X"],["dc.rights","CC BY 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.title","Comparison of Methods for the Estimation of Total Inorganic Nitrogen Deposition to Forests in Germany"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","045019"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Environmental Research Letters"],["dc.bibliographiccitation.volume","4"],["dc.contributor.affiliation","Panferov, O;"],["dc.contributor.affiliation","Doering, C;"],["dc.contributor.affiliation","Rauch, E;"],["dc.contributor.affiliation","Sogachev, A;"],["dc.contributor.affiliation","Ahrends, B;"],["dc.contributor.author","Panferov, Oleg"],["dc.contributor.author","Rauch, Elke"],["dc.contributor.author","Sogachev, A."],["dc.contributor.author","Ahrends, Bernd"],["dc.contributor.author","Doering, C"],["dc.date.accessioned","2018-11-07T11:23:29Z"],["dc.date.available","2018-11-07T11:23:29Z"],["dc.date.issued","2009"],["dc.date.updated","2022-02-09T13:18:55Z"],["dc.description.abstract","Wind damage is one of the major natural disturbances that can occur worldwide in most types of forests. Enhanced management using adequate decision support systems (DSS) can considerably reduce the risk of windthrow. The decision support system 'Forest and Climate Change' (DSS-WuK) which is currently being developed at Gottingen University aims at providing a tool for the quantitative assessment of biotic and abiotic risks for forest ecosystems under the conditions of changing climate. In order to assess the future risks of wind damage the system employs a coupled modelling approach combining the turbulence model SCAlar DIStribution (SCADIS) with the soil-vegetation-atmosphere-transfer (SVAT) model BROOK 90. The present study investigates projections of wind damage in Solling, Germany under climate scenarios A1B and B1, taking into account the windthrow feedbacks-changes of microclimate as a result of tree fall and consequent stabilization or destabilization of a forest stand. The results of the study indicate that in Solling the risk of windthrow for spruce and pine forest stands is likely to increase considerably during the 21st century. The general tendencies indicate that under A1B the probability of damage would be higher than under B1 and that under the same climate and soil conditions the risk for spruce stands would be higher than for pine stands of equal age. The degree of damage and feedback contribution as well as a sign of feedback in each particular case will strongly depend on the particular local or regional combination of climatic and soil factors with tree species, age and structure. For Solling the positive feedback to local climatic forcing is found. The feedback contributes considerably (up to 6% under given conditions) to the projected forest damage and cannot be neglected. Therefore, the adequate projection of future damage probabilities can be performed only with a process-based coupled soil-atmosphere model with corresponding high spatial and temporal resolution."],["dc.identifier.doi","10.1088/1748-9326/4/4/045019"],["dc.identifier.isi","000272900500036"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/5858"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56209"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1748-9326"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Feedbacks of windthrow for Norway spruce and Scots pine stands under changing climate"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","91"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Open Geography Journal"],["dc.bibliographiccitation.lastpage","102"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Ahrends, B."],["dc.contributor.author","Penne, C."],["dc.contributor.author","Panferov, O."],["dc.date.accessioned","2019-07-09T11:53:11Z"],["dc.date.available","2019-07-09T11:53:11Z"],["dc.date.issued","2010"],["dc.description.abstract","Forests are influenced by many disturbances, especially drought, windthrow, pest attacks, air pollution, and forest management. The climate change results in increasing frequency of weather extremes which will probably cause drought stresses in European forest ecosystems. By integrating several new features within the BROOK90 model, smallscale coupled process-based modeling was carried out for different climate and target diameter harvesting scenarios in the region of Solling, Germany. The results show considerable increment of drought risks towards 2100 compared to “present climate conditions”, caused by changes in precipitation and increase of mean air temperature. Beyond this it is shown that for the Solling site the changes of structure and microclimate produced by target diameter harvesting result in a decrease of drought stress and could be implemented to mitigate drought events."],["dc.identifier.doi","10.2174/1874923201003010091"],["dc.identifier.fs","579286"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6978"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60360"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.issn","1874-9232"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","570"],["dc.title","Impact of Target Diameter Harvesting on Spatial and Temporal Pattern of Drought Risk in Forest Ecosystems Under Climate Change Conditions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","219"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Forests"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Albert, Matthias"],["dc.contributor.author","Fleck, Stefan"],["dc.contributor.author","Ahrends, Bernd"],["dc.contributor.author","Sutmöller, Johannes"],["dc.contributor.author","Evers, Jan"],["dc.contributor.author","Meesenburg, Henning"],["dc.date.accessioned","2022-11-04T11:01:50Z"],["dc.date.available","2022-11-04T11:01:50Z"],["dc.date.issued","2017"],["dc.description.abstract","The North German Lowland is a region with locally high nitrate (NO3−) concentrations in seepage water, inducing an increased susceptibility to the effects of climate change. The future risk of rising NO3− concentrations in seepage water from forests was quantified for four regions in the North German Lowland using climate projections and a modelling system comprising submodels for forest stand development (WaldPlaner), water budgets (WaSiM-ETH), and biogeochemical element cycles (VSD+). The simulations for the period from 1990 to 2070 included three different forest management scenarios (reference, biodiversity, and climate protection) and showed a general decrease in groundwater recharge which could hardly be influenced by any of the management options. The simulated soil organic matter stocks adequately represented their past increase as expected from the National Forest Soil Inventory (NFSI), but also showed a future decline under climate change conditions which leads to higher organic matter decomposition and a long-lasting increase of NO3− leaching from forest soils. While the climate protection oriented scenario shows the highest increase in NO3− concentrations during the projection period until 2070, the biodiversity scenario kept NO3− concentrations in seepage water below the legal thresholds in three of four selected model regions."],["dc.identifier.doi","10.3390/f8060219"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/116947"],["dc.identifier.url","http://dx.doi.org/10.3390/f8060219"],["dc.language.iso","en"],["dc.relation.issn","1999-4907"],["dc.relation.orgunit","Nordwestdeutsche Forstliche Versuchsanstalt"],["dc.rights","CC BY 4.0"],["dc.title","Is Biomass Accumulation in Forests an Option to Prevent Climate Change Induced Increases in Nitrate Concentrations in the North German Lowland?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]