Ammer, Christian

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[["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","19"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.lastpage","26"],["dc.bibliographiccitation.volume","395"],["dc.contributor.author","Juchheim, Julia"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Schall, Peter"],["dc.contributor.author","Seidel, Dominik"],["dc.date.accessioned","2017-12-19T15:59:41Z"],["dc.date.available","2017-12-19T15:59:41Z"],["dc.date.issued","2017"],["dc.description.abstract","Silvicultural success in achieving, among other management goals, maximum productivity strongly depends on knowledge of the relationship between stand density and the resulting growth response of a stand. However, there are still controversial discussions whether wood production can be enhanced by silvicultural thinning or reaches its maximum in unmanaged forest stands if time plays no role. Moreover there is no universal answer whether structural diversity promotes or reduces productivity. In the present study we applied terrestrial laser scanning (TLS) to investigate the relationship between three-dimensional space filling, forest management intensity, productivity and conventional measures of structural diversity. We examined 35 beech-dominated forest plots along a gradient of management intensity in three regions of Germany. We found that space filling in leaf-on condition increased with management intensity, particularly in the shaded crown. Increased space filling in the shaded crown due to tree removals also resulted in higher stand productivity. We conclude that an increased space filling in the shaded canopy of managed European beech stands is responsible for the compensation of production losses in the upper canopy due to thinning activities. Conventional measures of structural diversity were not sensitive to the applied silvicultural activities. We also found no relationship between structural diversity described by conventional measures and stand productivity."],["dc.identifier.doi","10.1016/j.foreco.2017.03.036"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/11510"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Canopy space filling rather than conventional measures of structural diversity explains productivity of beech stands"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","212"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.lastpage","223"],["dc.bibliographiccitation.volume","380"],["dc.contributor.author","Ehbrecht, Martin"],["dc.contributor.author","Schall, Peter"],["dc.contributor.author","Juchheim, Julia"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Seidel, Dominik"],["dc.date.accessioned","2017-09-07T11:47:20Z"],["dc.date.available","2017-09-07T11:47:20Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1016/j.foreco.2016.09.003"],["dc.identifier.gro","3146736"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4532"],["dc.notes.status","final"],["dc.publisher","Elsevier BV"],["dc.relation.issn","0378-1127"],["dc.title","Effective number of layers: A new measure for quantifying three-dimensional stand structure based on sampling with terrestrial LiDAR"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["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.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","119"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.lastpage","128"],["dc.bibliographiccitation.volume","336"],["dc.contributor.author","Seidel, D."],["dc.contributor.author","Hoffmann, N."],["dc.contributor.author","Ehbrecht, M."],["dc.contributor.author","Juchheim, J."],["dc.contributor.author","Ammer, C."],["dc.date.accessioned","2017-09-07T11:47:51Z"],["dc.date.available","2017-09-07T11:47:51Z"],["dc.date.issued","2015"],["dc.description.abstract","In an even-aged mono-specific stand we evaluated the use of unclassified point clouds from single- and multiple-scan terrestrial laser scanning as a tool to determine various attributes of growing space and neighborhood structure of fifteen Metasequoia glyptostroboides (Hu.) trees. It was found that almost all tested attributes were related to diameter increment at breast height (Di) of the target tree, but also to diameter at breast height itself (DBH). A comparison of various additive models that accounted for the additional explanatory power of attributes other than DBH revealed that measures of space filling were most suitable estimators of Di. Upside-down search cones fixed at low heights in the stand performed best to explain Di, which is in contrast to previous studies that recommended the use of search cones fixed at greater heights in the tree. Surprisingly, we found search-cones fixed at 60% of the tree height to be more closely related with diameter increment at that height (Di60%) than with Di. Furthermore, our study revealed that multiple-scan based measurements of space filling in the neighborhood of a tree should always be favored over single-scan measurements due to their generally higher quality and greater comprehensiveness in the representation of a forest scene."],["dc.identifier.doi","10.1016/j.foreco.2014.10.020"],["dc.identifier.gro","3146773"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4574"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0378-1127"],["dc.title","How neighborhood affects tree diameter increment – New insights from terrestrial laser scanning and some methodical considerations"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["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.journal","New Forests"],["dc.contributor.author","Rebola-Lichtenberg, Jessica"],["dc.contributor.author","Streit, Juliane"],["dc.contributor.author","Schall, Peter"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Seidel, Dominik"],["dc.date.accessioned","2021-04-14T08:32:08Z"],["dc.date.available","2021-04-14T08:32:08Z"],["dc.date.issued","2020"],["dc.description.abstract","Short rotation coppices play an important role in providing biomass for energetic use. Mixing fast-growing tree species in short rotation coppices may show complementarity effects and increased yield. The aim of this study was to analyze the effect of species interaction in mixed short rotation coppices with fast-growing Populus spp.-hybrids and the N-fixing Robinia pseudoacacia. Four different Populus-hybrids (AF2, Fritzi Pauley, Hybride 275 and Max 1), planted alternately in pure and mixed stands with R. pseudoacacia were used for the analysis. Height and root collar diameter were measured once a year, over a period of four years (2014–2017). Additionally, in the third year, aboveground competition was surveyed with a terrestrial laser scanner and root biomass was analyzed to assess belowground competition. Soil nitrogen was also determined in order to verify enrichment properties of mixtures compared to pure stands. Populus-hybrids’ stem volume showed no significant differences between stand types in the first year after planting. In the second and third year, however, two Populus-hybrids (AF2 and Max 1) had a higher stem volume increment of up to 3.8 times than stem volume increment in pure stands. This may be related to the fact that soil nitrogen was 39% higher in the mixtures than in pure stands. However, in the 4th year after stand establishment, R. pseudoacacia’s crowns were so massive and broad, that this species was far more competitive than the Populus-hybrids. With the exception of P. ‘Fritzi Pauley’, which showed no significant differences between stand types, growth rates reversed for the other three Populus-hybrids. AF2, Max 1 and Hybride 275 showed up to 75% lower stem volume increment in mixtures compared to pure stands. We assume that, in spite of the initially observed facilitation between the species, the competition exerted by R. pseudoacacia started dominating after 4 years and began to surpass the benefits of facilitation."],["dc.identifier.doi","10.1007/s11056-020-09813-2"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/83820"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1573-5095"],["dc.relation.haserratum","/handle/2/83295"],["dc.relation.issn","0169-4286"],["dc.relation.orgunit","Zentrum für Biodiversität und Nachhaltige Landnutzung"],["dc.rights","CC BY 4.0"],["dc.title","From facilitation to competition: the effect of black locust (Robinia pseudoacacia L.) on the growth performance of four poplar-hybrids (Populus spp.) in mixed short rotation coppice"],["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","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"]]