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.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","746"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Agricultural and Forest Meteorology"],["dc.bibliographiccitation.lastpage","754"],["dc.bibliographiccitation.volume","151"],["dc.contributor.author","Sogachev, A."],["dc.contributor.author","Panferov, Oleg"],["dc.contributor.author","Ahrends, Bernd"],["dc.contributor.author","Doering, C."],["dc.contributor.author","Jorgensen, H. E."],["dc.date.accessioned","2018-11-07T08:55:06Z"],["dc.date.available","2018-11-07T08:55:06Z"],["dc.date.issued","2011"],["dc.description.abstract","There are many natural and anthropogenic reasons why a gap can occur inside the forest. When a gap appears within a studied stand (e.g. near a flux tower which operated for some time, providing information about the ecosystem-atmosphere exchange), an assessment of new measurement conditions should be carried out. Using a three-dimensional approach for footprint estimation based on numerical solution of Reynolds-Averaged Navier-Stokes (RANS) equations, we investigated possible changes in air flow and CO2 flux footprints resulting from two suggested forest management activities - clear-cut and stripe-cut - around the flux tower located in 130-year-old spruce forest in the Soiling highland, Germany. The model results show that degree of changes in flux footprints depends on the chosen management strategy. The clear-cut strategy produces the largest changes and the stripe-cut leads to weaker changes of investigated characteristics. The role of remote canopy sources increases, while the contribution of remote soil sources decreases with increased share of removed trees. In general, the investigated characteristics change differently for summer and winter due to the combined effects of phenology and upwind topography. (C) 2010 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.agrformet.2010.10.010"],["dc.identifier.isi","000290193500009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22827"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","International Conference on Atmospheric Transport and Chemistry in Forest Ecosystems"],["dc.relation.eventlocation","Bayreuth, GERMANY"],["dc.relation.issn","0168-1923"],["dc.relation.orgunit","Abteilung Bioklimatologie"],["dc.title","Numerical assessment of the effect of forest structure changes on CO2 flux footprints for the flux tower in Soiling, Germany"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]