Ammer, Christian

[["cris.virtual.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.author-orcid","0000-0001-8126-5307"],["cris.virtual.author-orcid","0000-0002-4235-0135"],["cris.virtual.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.author-orcid","0000-0003-4131-9424"],["cris.virtual.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.department","Fakultät für Forstwissenschaften und Waldökologie"],["cris.virtual.department","Präsidium"],["cris.virtual.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtual.department","Abteilung Waldbau und Waldökologie der gemäßigten Zonen"],["cris.virtualsource.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.author-orcid","86db7e4a-1f3e-4e70-86da-445899f11b26"],["cris.virtualsource.author-orcid","2301d346-4dea-4aa5-a716-15beccf00827"],["cris.virtualsource.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.author-orcid","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.author-orcid","6f61c9e1-5566-4dc3-b7d1-67ee37efa6ee"],["cris.virtualsource.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.department","86db7e4a-1f3e-4e70-86da-445899f11b26"],["cris.virtualsource.department","2301d346-4dea-4aa5-a716-15beccf00827"],["cris.virtualsource.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.department","#PLACEHOLDER_PARENT_METADATA_VALUE#"],["cris.virtualsource.department","6f61c9e1-5566-4dc3-b7d1-67ee37efa6ee"],["dc.bibliographiccitation.firstpage","1684"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Sensors"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Willim, Katharina"],["dc.contributor.author","Stiers, Melissa"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Ehbrecht, Martin"],["dc.contributor.author","Kabal, Myroslav"],["dc.contributor.author","Stillhard, Jonas"],["dc.contributor.author","Seidel, Dominik"],["dc.date.accessioned","2020-12-10T18:47:21Z"],["dc.date.available","2020-12-10T18:47:21Z"],["dc.date.issued","2019"],["dc.description.sponsorship","German Research Foundation"],["dc.identifier.doi","10.3390/s19071684"],["dc.identifier.eissn","1424-8220"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78731"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.publisher","MDPI"],["dc.relation.eissn","1424-8220"],["dc.rights","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Assessing Understory Complexity in Beech-dominated Forests (Fagus sylvatica L.) in Central Europe—From Managed to Primary Forests"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","107699"],["dc.bibliographiccitation.journal","Agricultural and Forest Meteorology"],["dc.bibliographiccitation.volume","278"],["dc.contributor.author","Seidel, Dominik"],["dc.contributor.author","Ehbrecht, Martin"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Ammer, Christian"],["dc.date.accessioned","2020-12-10T14:22:17Z"],["dc.date.available","2020-12-10T14:22:17Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1016/j.agrformet.2019.107699"],["dc.identifier.issn","0168-1923"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71566"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","From tree to stand-level structural complexity — Which properties make a forest stand complex?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","23"],["dc.bibliographiccitation.journal","Nature Conservation"],["dc.bibliographiccitation.lastpage","64"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Pham, Van Vien"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Heinrichs, Steffi"],["dc.date.accessioned","2022-11-01T10:17:31Z"],["dc.date.available","2022-11-01T10:17:31Z"],["dc.date.issued","2022"],["dc.description.abstract","Plant species diversity and composition play crucial roles in many ecosystem services and are largely influenced by environmental conditions, as well as natural and/or anthropogenic disturbances. However, our knowledge of the drivers of plant species diversity and composition in the limestone forests of Vietnam, a hotspot of biodiversity, is limited. To fill this knowledge gap, we surveyed plant species in the Cat Ba National Park (CBNP), located on a limestone archipelago. We hypothesised that: (1) topography, accessibility and spatial isolation drive the diversity and composition of plant communities in the CBNP and that (2) isolated areas contribute to high floristic regional diversity by supporting unique species assemblages. We expected high tree species diversity within the tropical limestone forests of the CBNP, but also that: (3) the abundance of non-tree species negatively affects tree regeneration diversity and abundance. Data were obtained from 90 random sample plots (500 m\r\n 2\r\n ) and 450 sub-sample plots (25 m\r\n 2\r\n ) in three areas of the CBNP. We differentiated four different plant species communities and found a total of 302 species belonging to 112 families. Tree species contributed 50% to total species richness. The distribution of different plant communities in the CBNP was driven mainly by topography; that is, the percentage of rock surface and slope and concomitant differences in soil depth. Contrary to our expectations, isolated areas did not contribute greatly to the CBNP’s plant species diversity. It seems that isolated areas and, as in our case, rough topography, may act as natural barriers to seed dispersal, creating an environmental filter for tree species. Across the CBNP, there was no effect of non-tree species on tree species regeneration, but regeneration patterns differed between communities. In species-rich communities growing under favourable site conditions (e.g. low rock surface and slope), greater coverage by non-tree species had an increasingly negative effect on tree species richness and abundance in the regeneration layer. The opposite was observed in communities growing under harsh site conditions. We conclude that plant species diversity in the CBNP is high, particularly in easily accessible lowland areas where tree species contribute greatly to biodiversity. However, here, non-tree species can even restrict tree regeneration."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2022"],["dc.identifier.doi","10.3897/natureconservation.50.86490"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/116829"],["dc.notes.intern","DOI-Import GROB-605"],["dc.relation.eissn","1314-3301"],["dc.relation.issn","1314-6947"],["dc.rights","CC BY 4.0"],["dc.title","Plant species diversity and composition in limestone forests of the Vietnamese Cat Ba National Park"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","616"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Forestry (Oxford)"],["dc.bibliographiccitation.lastpage","626"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Seidel, Dominik"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Stephens, Scott L"],["dc.contributor.author","York, Robert A"],["dc.date.accessioned","2020-12-10T18:19:12Z"],["dc.date.available","2020-12-10T18:19:12Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1093/forestry/cpz038"],["dc.identifier.eissn","1464-3626"],["dc.identifier.issn","0015-752X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75161"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Silvicultural implications from analyzing light induced height growth development of eight North American juvenile tree species in mixed-conifer forests"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","690"],["dc.bibliographiccitation.journal","Frontiers in Plant Science"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Seidel, Dominik"],["dc.contributor.author","Mölder, Andreas"],["dc.contributor.author","Ammer, Christian"],["dc.date.accessioned","2019-07-09T11:51:57Z"],["dc.date.available","2019-07-09T11:51:57Z"],["dc.date.issued","2019"],["dc.description.abstract","Tree saplings are exposed to a competitive growth environment in which resources are limited and the ability to adapt determines general vitality and specific growth performance. In this study we analyzed the aboveground spatial neighborhood of oak [Quercus petraea (Matt.) Liebl.] and beech (Fagus sylvatica L.) saplings growing in Germany, by using hemispherical photography and terrestrial laser scanning as proxy for the competitive pressure saplings were exposed to. The hemispherical images were used to analyze the light availability and the three-dimensional (3D) point clouds from the laser scanning were used to assess the space and forest structure around the saplings. The aim was to increase the precision with which the biomass allocation, growth, and morphology of the saplings could be predicted by including more detailed information of their environment. The predictive strength of the models was especially increased through direct neighborhood variables (e.g., relative space filling), next to the light availability being the most important predictor variable. The biomass allocation patterns within the more light demanding oak were strongly driven by the space availability around the saplings. Diameter and height growth variables of both species reacted significantly to changes in light availability, and partly also to the neighborhood variables. The leaf morphology [as leaf-area ratio (LAR)] was also driven by light availability and decreased with increasing light availability. However, the branch morphology (as mean branch weight) could not be explained for oak and the model outcome for beech was hard to interpret. The results could show that individuals of the same species perform differently under constant light conditions but differing neighborhoods. Assessing the neighborhood of trees with highly precise measurement devices, like terrestrial laser scanners, proved to be useful. However, the primary response to a dense neighborhood seemed to be coping with a reduction of the lateral light availability aboveground, rather than responding to an increase of competition belowground. The results suggest continuing efforts to increase the precision with which plant environments can be described through innovative and efficient methods, like terrestrial laser scanning."],["dc.identifier.doi","10.3389/fpls.2019.00690"],["dc.identifier.pmid","31191589"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16245"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60048"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject.ddc","570"],["dc.title","Advanced Aboveground Spatial Analysis as Proxy for the Competitive Environment Affecting Sapling Development"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","171"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","European Journal of Forest Research"],["dc.bibliographiccitation.lastpage","183"],["dc.bibliographiccitation.volume","136"],["dc.contributor.author","Dirnberger, Gerald"],["dc.contributor.author","Sterba, Hubert"],["dc.contributor.author","Condés, Sonia"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Avdagić, Admir"],["dc.contributor.author","Bielak, Kamil"],["dc.contributor.author","Brazaitis, Gediminas"],["dc.contributor.author","Coll, Lluís"],["dc.contributor.author","Heym, Michael"],["dc.contributor.author","Hurt, Václav"],["dc.contributor.author","Kurylyak, Viktor"],["dc.contributor.author","Motta, Renzo"],["dc.contributor.author","Pach, Maciej"],["dc.contributor.author","Ponette, Quentin"],["dc.contributor.author","Ruiz-Peinado, Ricardo"],["dc.contributor.author","Skrzyszewski, Jerzy"],["dc.contributor.author","Šrámek, Vít"],["dc.contributor.author","Streel, Géraud de"],["dc.contributor.author","Svoboda, Miroslav"],["dc.contributor.author","Zlatanov, Tzvetan"],["dc.contributor.author","Pretzsch, Hans"],["dc.date.accessioned","2017-09-07T11:47:20Z"],["dc.date.available","2017-09-07T11:47:20Z"],["dc.date.issued","2017"],["dc.description.abstract","Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) dominate many of the European forest stands. Also, mixtures of European beech and Scots pine more or less occur over all European countries, but have been scarcely investigated. The area occupied by each species is of high relevance, especially for growth evaluation and comparison of different species in mixed and monospecific stands. Thus, we studied different methods to describe species proportions and their definition as proportion by area. 25 triplets consisting of mixed and monospecific stands were established across Europe ranging from Lithuania to Spain in northern to southern direction and from Bulgaria to Belgium in eastern to western direction. On stand level, the conclusive method for estimating the species proportion as a fraction of the stand area relates the observed density (tree number or basal area) to its potential. This stand-level estimation makes use of the potential from comparable neighboring monospecific stands or from maximum density lines derived from other data, e.g. forest inventories or permanent observations plots. At tree level, the fraction of the stand area occupied by a species can be derived from the proportions of their crown projection area or of their leaf area. The estimates of the potentials obtained from neighboring monospecific stands, especially in older stands, were poorer than those from the maximum density line depending on the Martonne aridity index. Therefore, the stand-level method in combination with the Martonne aridity index for potential densities can be highly recommended. The species’ proportions estimated with this method are best approximated by the proportions of the species’ leaf areas. In forest practice, the most commonly applied method is an ocular estimation of the proportions by crown projection area. Even though the proportions of pine were calculated here by measuring crown projection areas in the field, we found this method to underestimate the proportion by 25% compared to the stand-level approach."],["dc.identifier.doi","10.1007/s10342-016-1017-0"],["dc.identifier.gro","3146735"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14360"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4531"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.issn","1612-4669"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Species proportions by area in mixtures of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.)"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","76"],["dc.bibliographiccitation.journal","Applied Geography"],["dc.bibliographiccitation.lastpage","80"],["dc.bibliographiccitation.volume","93"],["dc.contributor.author","Seidel, Dominik"],["dc.contributor.author","Hähn, Nalise"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Benten, Anke"],["dc.contributor.author","Vor, Torsten"],["dc.contributor.author","Ammer, Christian"],["dc.date.accessioned","2020-12-10T14:22:25Z"],["dc.date.available","2020-12-10T14:22:25Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1016/j.apgeog.2018.02.015"],["dc.identifier.issn","0143-6228"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71602"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Assessment of roe deer (Capreolus capreolus L.) – vehicle accident hotspots with respect to the location of \\‘trees outside forest' along roadsides"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","S0378112721010355"],["dc.bibliographiccitation.firstpage","119942"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.volume","505"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Mund, Martina"],["dc.contributor.author","Seidel, Dominik"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Ameztegui, Aitor"],["dc.contributor.author","Balandier, Philippe"],["dc.contributor.author","Bebre, Ieva"],["dc.contributor.author","Coll, Lluís"],["dc.contributor.author","Collet, Catherine"],["dc.contributor.author","Hamm, Tobias"],["dc.contributor.author","Jürgen, Bauhus"],["dc.date.accessioned","2022-04-01T10:02:25Z"],["dc.date.available","2022-04-01T10:02:25Z"],["dc.date.issued","2022"],["dc.identifier.doi","10.1016/j.foreco.2021.119942"],["dc.identifier.pii","S0378112721010355"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/105906"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-530"],["dc.relation.issn","0378-1127"],["dc.rights.uri","https://www.elsevier.com/tdm/userlicense/1.0/"],["dc.title","Examination of aboveground attributes to predict belowground biomass of young trees"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1603"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Canadian Journal of Forest Research"],["dc.bibliographiccitation.lastpage","1613"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Höwler, Kirsten"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Seidel, Dominik"],["dc.date.accessioned","2017-12-19T15:34:10Z"],["dc.date.available","2017-12-19T15:34:10Z"],["dc.date.issued","2017"],["dc.description.abstract","Accurate information on the timber quality of hardwoods is often lacking, in particular for standing trees. In situ measurements of timber quality have the potential to improve the economic yield of a stand and may contribute to the optimal timing of a harvest and, in general, to improving forest management. Here, we used terrestrial laser scanning (TLS) to assess external timber quality metrics nondestructively. We investigated how competition intensity affected the metrics of 118 European beech (Fagus sylvatica L.) trees. We found that two newly developed TLS-based measures of external stem characteristics (number of bark anomalies per metre and stem non-circularity) were affected by competition intensity, suggesting that regulating competition levels may improve timber quality. Our study confirms empirical findings indicating a positive relationship between competition intensity and timber quality of European beech and offers a new methodology to assess external timber quality measures in the field objectively and nondestructively."],["dc.identifier.doi","10.1139/cjfr-2017-0262"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/11508"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Competition improves quality-related external stem characteristics of Fagus sylvatica"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","22"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Restoration Ecology"],["dc.bibliographiccitation.lastpage","30"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Skowronek, Sandra"],["dc.contributor.author","Terwei, André"],["dc.contributor.author","Zerbe, Stefan"],["dc.contributor.author","Mölder, Inga"],["dc.contributor.author","Annighöfer, Peter"],["dc.contributor.author","Kawaletz, Heike"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Heilmeier, Hermann"],["dc.date.accessioned","2017-09-07T11:47:52Z"],["dc.date.available","2017-09-07T11:47:52Z"],["dc.date.issued","2014"],["dc.description.abstract","Soil seed banks are the ecological memory of plant communities and might represent their regeneration potential. This study examines the soil seed bank in hardwood floodplain forests of the biosphere reserve “Valle del Ticino” (Northern Italy) to find out whether the natural forest vegetation can potentially be restored by the soil seed bank. We compared near natural forests of the phytosociological association Polygonato multiflori–Quercetum roboris with stands dominated by the nonnative tree species Robinia pseudoacacia and Prunus serotina in order to investigate whether the composition of the soil seed bank is significantly influenced by the composition of the main canopy tree species and soil properties. Soil seed bank samples were taken from 20 randomly selected plots in stands that were differentiated into four groups related to the dominant forest canopy species. The germinated plants were counted and their species determined. A total of 2,427 plants belonging to 84 species were recorded. The composition of the dominant tree species and soil parameters significantly influence the composition of the seed bank. The similarity with the standing vegetation was very low. Only 13% of the species in the soil seed bank represent the target vegetation. The low percentage of target species and the high percentage of nonnative species imply that the regeneration of near-natural forest vegetation from the soil seed bank is not feasible. Consequently, disturbances that may activate the soil seed bank should be minimized. Thus, we recommend stopping the mechanical removal of the nonnative tree species in the Ticino Park."],["dc.identifier.doi","10.1111/rec.12027"],["dc.identifier.gro","3146776"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4577"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1061-2971"],["dc.title","Regeneration Potential of Floodplain Forests Under the Influence of Nonnative Tree Species: Soil Seed Bank Analysis in Northern Italy"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]