Albert, Katja

[["dc.bibliographiccitation.firstpage","20"],["dc.bibliographiccitation.journal","Biomass and Bioenergy"],["dc.bibliographiccitation.lastpage","25"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Seidel, D."],["dc.contributor.author","Albert, Katja"],["dc.contributor.author","Fehrmann, L."],["dc.contributor.author","Ammer, C."],["dc.date.accessioned","2017-09-07T11:47:48Z"],["dc.date.available","2017-09-07T11:47:48Z"],["dc.date.issued","2012"],["dc.description.abstract","Methods for estimating the biomass potential of dense coppice in coppice-with-standard forests in a fast and objective way are currently rare. We adapted existing methodical approaches for biomass estimations from terrestrial laser scanning developed for mature stands in order to perform single scan measurements of diameter at breast height in extremely dense coppice with a stem density of 30,000 ha−1. Diameter was then used as input for allometric regression models for estimations of the dry weights. As a tribute to the dense stocking on the investigated stands study plots were smaller than in previous studies focusing on mature forests. Results were found to be sound with a mean absolute error of about 6.9 kg which is equal to a relative error of 11.1%. With respect to the strongly reduced amount of field work the method is therefore of high efficiency. With the new approach reliable assessments of the bioenergy potentials become possible for coppice stands, which might play an important role in future tasks of mitigating climate change."],["dc.identifier.doi","10.1016/j.biombioe.2012.10.009"],["dc.identifier.gro","3146769"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4570"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0961-9534"],["dc.title","The potential of terrestrial laser scanning for the estimation of understory biomass in coppice-with-standard systems"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A11"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.volume","642"],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","del Toro Iniesta, J. C."],["dc.contributor.author","Woch, J."],["dc.contributor.author","Gandorfer, A."],["dc.contributor.author","Hirzberger, J."],["dc.contributor.author","Alvarez-Herrero, A."],["dc.contributor.author","Appourchaux, T."],["dc.contributor.author","Martínez Pillet, V."],["dc.contributor.author","Pérez-Grande, I."],["dc.contributor.author","Schmidt, W."],["dc.contributor.author","Lange, T."],["dc.contributor.author","Müller, D."],["dc.contributor.author","Gizon, Laurent"],["dc.contributor.author","Müller, R."],["dc.contributor.author","Albert, K."],["dc.contributor.author","Löptien, Björn"],["dc.contributor.author","Meyer, S."],["dc.contributor.author","Soltau, D."],["dc.contributor.author","Schou, Jesper"],["dc.date.accessioned","2021-03-05T08:58:36Z"],["dc.date.available","2021-03-05T08:58:36Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1051/0004-6361/201935325"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/80195"],["dc.notes.intern","DOI Import GROB-393"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","The Polarimetric and Helioseismic Imager on Solar Orbiter"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","225"],["dc.bibliographiccitation.issue","11-12"],["dc.bibliographiccitation.journal","Allgemeine Forst- und Jagdzeitung"],["dc.bibliographiccitation.lastpage","237"],["dc.bibliographiccitation.volume","183"],["dc.contributor.author","Albert, Katja"],["dc.contributor.author","Ammer, Christian"],["dc.date.accessioned","2018-11-07T09:14:34Z"],["dc.date.available","2018-11-07T09:14:34Z"],["dc.date.issued","2012"],["dc.identifier.isi","000315177300001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27445"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","J D Sauerlanders Verlag"],["dc.relation.issn","0002-5852"],["dc.title","Biomass productivity of selected coppice and coppice with standard forests in Europe - Comparative results of a meta analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","A143"],["dc.bibliographiccitation.journal","Astronomy & Astrophysics"],["dc.bibliographiccitation.volume","660"],["dc.contributor.author","Kahil, F."],["dc.contributor.author","Hirzberger, J."],["dc.contributor.author","Solanki, S. K."],["dc.contributor.author","Chitta, L. P."],["dc.contributor.author","Peter, H."],["dc.contributor.author","Auchère, F."],["dc.contributor.author","Sinjan, J."],["dc.contributor.author","Orozco Suárez, D."],["dc.contributor.author","Albert, K."],["dc.contributor.author","Albelo Jorge, N."],["dc.contributor.author","Gissot, S."],["dc.date.accessioned","2022-06-01T09:39:13Z"],["dc.date.available","2022-06-01T09:39:13Z"],["dc.date.issued","2022"],["dc.description.abstract","Context. The Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft observed small extreme ultraviolet (EUV) bursts, termed campfires, that have been proposed to be brightenings near the apexes of low-lying loops in the quiet-Sun atmosphere. The underlying magnetic processes driving these campfires are not understood. Aims. During the cruise phase of SO and at a distance of 0.523 AU from the Sun, the Polarimetric and Helioseismic Imager on Solar Orbiter (SO/PHI) observed a quiet-Sun region jointly with SO/EUI, offering the possibility to investigate the surface magnetic field dynamics underlying campfires at a spatial resolution of about 380 km. Methods. We used co-spatial and co-temporal data of the quiet-Sun network at disc centre acquired with the High Resolution Imager of SO/EUI at 17.4 nm (HRI EUV , cadence 2 s) and the High Resolution Telescope of SO/PHI at 617.3 nm (HRT, cadence 2.5 min). Campfires that are within the SO/PHI−SO/EUI common field of view were isolated and categorised according to the underlying magnetic activity. Results. In 71% of the 38 isolated events, campfires are confined between bipolar magnetic features, which seem to exhibit signatures of magnetic flux cancellation. The flux cancellation occurs either between the two main footpoints, or between one of the footpoints of the loop housing the campfire and a nearby opposite polarity patch. In one particularly clear-cut case, we detected the emergence of a small-scale magnetic loop in the internetwork followed soon afterwards by a campfire brightening adjacent to the location of the linear polarisation signal in the photosphere, that is to say near where the apex of the emerging loop lays. The rest of the events were observed over small scattered magnetic features, which could not be identified as magnetic footpoints of the campfire hosting loops. Conclusions. The majority of campfires could be driven by magnetic reconnection triggered at the footpoints, similar to the physical processes occurring in the burst-like EUV events discussed in the literature. About a quarter of all analysed campfires, however, are not associated to such magnetic activity in the photosphere, which implies that other heating mechanisms are energising these small-scale EUV brightenings."],["dc.identifier.doi","10.1051/0004-6361/202142873"],["dc.identifier.pii","aa42873-21"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/108417"],["dc.notes.intern","DOI-Import GROB-572"],["dc.relation.eissn","1432-0746"],["dc.relation.issn","0004-6361"],["dc.title","The magnetic drivers of campfires seen by the Polarimetric and Helioseismic Imager (PHI) on Solar Orbiter"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","8699"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","International Journal of Remote Sensing"],["dc.bibliographiccitation.lastpage","8709"],["dc.bibliographiccitation.volume","34"],["dc.contributor.author","Seidel, Dominik"],["dc.contributor.author","Albert, Katja"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Fehrmann, Lutz"],["dc.contributor.author","Kleinn, Christoph"],["dc.date.accessioned","2017-09-07T11:47:08Z"],["dc.date.available","2017-09-07T11:47:08Z"],["dc.date.issued","2013"],["dc.description.abstract","The total area of short-rotation tree plantations is increasing globally, one reason being the need to grow sustainable biomass for bio-energy production. Such stands are usually established with a very high stem density, and inventories for biomass estimation require the adaptation of traditional methods. In this study, we tested a novel, efficient, and non-destructive method for biomass estimation relevant to a high-density, short-rotation oak stand of about 16,500 stems ha−1. We used terrestrial laser scanning (TLS) in a single-scan design to measure diameter at breast height (DBH) of all trees within 2 m-radius sample plots. Allometric models were then used to predict the tree biomass from their diameter. Biomass estimates were compared to the true biomass determined after harvesting of the sample plots. Mean absolute error and mean relative error were 12.9 kg and 16.4%, respectively, and the coefficient of determination of the relationship between traditionally measured and scan-based biomass was r2 = 0.65 (p < 0.001). This TLS-based approach is promising as it considerably reduces fieldwork efforts in dense stands compared with traditional diameter tallying by calipers or tapes."],["dc.identifier.doi","10.1080/01431161.2013.848308"],["dc.identifier.gro","3149258"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5915"],["dc.language.iso","en"],["dc.notes.intern","Kleinn Crossref Import"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0143-1161"],["dc.title","Using terrestrial laser scanning to support biomass estimation in densely stocked young tree plantations"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","98"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Leipziger Sportwissenschaftliche Beiträge"],["dc.bibliographiccitation.lastpage","119"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Gramespacher, E."],["dc.contributor.author","Albert, Katja"],["dc.contributor.author","Hunger, Ina"],["dc.contributor.author","Lüsebrink, I."],["dc.date.accessioned","2021-02-19T08:20:13Z"],["dc.date.available","2021-02-19T08:20:13Z"],["dc.date.issued","2009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/79785"],["dc.language.iso","de"],["dc.relation.orgunit","Sozialwissenschaftliche Fakultät"],["dc.relation.orgunit","Institut für Sportwissenschaften"],["dc.relation.orgunit","Lehrstuhl für Sportpädagogik und -didaktik"],["dc.title","Forschungswerkstätten - Basis für qualitative Forschung"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","210"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Scandinavian Journal of Forest Research"],["dc.bibliographiccitation.lastpage","221"],["dc.bibliographiccitation.volume","29"],["dc.contributor.author","Albert, Katja"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Schumacher, Jens"],["dc.contributor.author","Ammer, Christian"],["dc.date.accessioned","2017-09-07T11:47:18Z"],["dc.date.available","2017-09-07T11:47:18Z"],["dc.date.issued","2014"],["dc.description.abstract","With an increasing demand of sustainable raw materials for bioenergy use, coppicing as management approach to increase the biomass production of forests is becoming of greater importance. This study describes the parameterization of biomass equations for six tree species traditionally used in coppices forests, namely sycamore maple (Acer pseudoplatanus L.), field maple (Acer campestre L.), European ash (Fraxinus excelsior L.), European hornbeam (Carpinus betulus L.), downy birch (Betula pubescens Ehrh.), and common hazel (Corylus avellana L.) growing in coppice-with-standard systems in Lower Saxony, Germany. The parameterization was based on measurements of over 950 trees sampled from two forest sites. The sampled trees were felled and separated into three biomass compartments (stem, coarse branches, and fine brushwood) and weighed on site. The dry weight of sub samples from each compartment was measured. Equations were derived for total aboveground biomass, stem biomass, and crown biomass using regression analyses. We either used diameter at breast height as single independent explanatory variable or in combination with tree height. Biomass production of stump sprouts and generatively grown stems was compared for ash and sycamore maple. In the same age classes, it was found that ash stump sprouts had a slightly higher production than seed-grown stems. For sycamore maple, no difference was detected."],["dc.identifier.doi","10.1080/02827581.2014.910267"],["dc.identifier.gro","3146706"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4499"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0282-7581"],["dc.title","Biomass equations for seven different tree species growing in coppice-with-standards forests in Central Germany"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","225"],["dc.bibliographiccitation.journal","Allgemeine Forst- und Jagdzeitung"],["dc.bibliographiccitation.lastpage","237"],["dc.bibliographiccitation.volume","183"],["dc.contributor.author","Albert, K."],["dc.contributor.author","Ammer, C."],["dc.date.accessioned","2017-09-07T11:49:30Z"],["dc.date.available","2017-09-07T11:49:30Z"],["dc.date.issued","2012"],["dc.identifier.gro","3149685"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6375"],["dc.language.iso","de"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.title","Biomasseproduktivität ausgewählter europäischer Mittel- und Niederwaldbestände - Ergebnisse einer vergleichenden Metaanalyse"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]