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","64"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Land und Forst"],["dc.bibliographiccitation.lastpage","65"],["dc.bibliographiccitation.volume","163"],["dc.contributor.author","Ammer, C."],["dc.date.accessioned","2017-09-07T11:49:34Z"],["dc.date.available","2017-09-07T11:49:34Z"],["dc.date.issued","2010"],["dc.identifier.gro","3149710"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6403"],["dc.language.iso","de"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.title","Der Waldbesitzer wird zum Steuermann"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["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","58"],["dc.bibliographiccitation.journal","LWF aktuell"],["dc.bibliographiccitation.lastpage","60"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Weber-Blaschke, G."],["dc.contributor.author","Heitz, R."],["dc.contributor.author","Blaschke, M."],["dc.contributor.author","Ammer, C."],["dc.date.accessioned","2017-09-07T11:49:29Z"],["dc.date.available","2017-09-07T11:49:29Z"],["dc.date.issued","2009"],["dc.identifier.gro","3149686"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6377"],["dc.language.iso","de"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.title","Wiederaufforstung mit Edellaubbäumen"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","721"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Tree Physiology"],["dc.bibliographiccitation.lastpage","728"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Ammer, C."],["dc.contributor.author","Stimm, B."],["dc.contributor.author","Mosandl, R."],["dc.date.accessioned","2017-09-07T11:47:18Z"],["dc.date.available","2017-09-07T11:47:18Z"],["dc.date.issued","2008"],["dc.description.abstract","We used height growth data from a 7-year field experiment with European beech (Fagus sylvatica L.) seedlings to test the hypothesis that the effects of above- and belowground resources on height growth depend on seedling size and age. Photosynthetically active radiation (PAR) was determined by hemispheric photography, and estimates of fine root biomass of the overstory trees were used as an inverse proportional surrogate for belowground resource availability. For recently germinated seedlings growing under the canopy of Picea abies (L.) Karst., belowground resource availability affected height growth more than light. During subsequent stages of seedling development, apart from initial seedling size, PAR increasingly determined seedling growth. Besides initial size, seedling age determined the effects of above- and belowground resources on seedling height growth. In seedlings identical in initial size but differing in age, the increase in height growth with increasing PAR was greater in older seedlings than in younger seedlings. The ranking of seedling height by year showed that small differences in size at the end of the first growing season resulted in continuously increasing differences during the following years. Mortality data indicated that the chances of a seedling surviving intraspecific competition was strongly determined by its dominance ranking within the first 5 years after establishment."],["dc.identifier.doi","10.1093/treephys/28.5.721"],["dc.identifier.gro","3146719"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4514"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0829-318X"],["dc.title","Ontogenetic variation in the relative influence of light and belowground resources on European beech seedling growth"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2340"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","2352"],["dc.bibliographiccitation.volume","56"],["dc.contributor.author","Zemp, Delphine Clara"],["dc.contributor.author","Gérard, Anne"],["dc.contributor.author","Hölscher, Dirk"],["dc.contributor.author","Ammer, Christian"],["dc.contributor.author","Irawan, Bambang"],["dc.contributor.author","Sundawati, Leti"],["dc.contributor.author","Teuscher, Miriam"],["dc.contributor.author","Kreft, Holger"],["dc.date.accessioned","2021-12-08T12:27:40Z"],["dc.date.available","2021-12-08T12:27:40Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1111/1365-2664.13460"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95414"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.relation","SFB 990: Ökologische und sozioökonomische Funktionen tropischer Tieflandregenwald-Transformationssysteme (Sumatra, Indonesien)"],["dc.relation","SFB 990 | B | B11: Biodiversitäts-Anreicherung in Ölpalmen-Plantagen: Pflanzliche Sukzession und Integration"],["dc.relation.eissn","1365-2664"],["dc.relation.issn","0021-8901"],["dc.relation.orgunit","Zentrum für Biodiversität und Nachhaltige Landnutzung"],["dc.subject.gro","sfb990_journalarticles"],["dc.title","Tree performance in a biodiversity enrichment experiment in an oil palm landscape"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]