Christian Ammer
University of Göttingen
EcologyBeechForest managementAgroforestryBiology
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Publications 162
Abstract: Light is one of the most critical factors controlling tree survival and growth. Limited light availability induces phenotypic plasticity, thus enabling plants to adapt to suboptimal conditions. The plastic responses are species-specific and are thought to largely depend on species’ shade tolerance. This study aims to add to existing research by trying to disentangle the effects of light, species identity, and shade tolerance on growth, biomass partitioning, and morphology of seedlings ...
#1Lea Heidrich (University of Würzburg)H-Index: 1
#2Soyeon Bae (University of Würzburg)H-Index: 1
Last. Alla Serebryanyk (Munich University of Applied Sciences)H-Index: 1
view all 24 authors...
The habitat heterogeneity hypothesis predicts that biodiversity increases with increasing habitat heterogeneity due to greater niche dimensionality. However, recent studies have reported that richness can decrease with high heterogeneity due to stochastic extinctions, creating trade-offs between area and heterogeneity. This suggests that greater complexity in heterogeneity–diversity relationships (HDRs) may exist, with potential for group-specific responses to different facets of heterogeneity t...
#1Katharina WillimH-Index: 3
#2Melissa StiersH-Index: 3
Last. Dominik SeidelH-Index: 18
view all 6 authors...
#1Dominik SeidelH-Index: 18
#2Peter AnnighöferH-Index: 15
Last. Christian AmmerH-Index: 29
view all 6 authors...
The threedimensional forest structure is an important driver of several ecosystem functions and services. Recent advancements in laser scanning technologies have set the path to measuring structural complexity directly from 3D point clouds. Here, we show that the box-dimension (Db) from fractal analysis, a measure of structural complexity, can be obtained from airborne laser scanning data. Based on 66 plots across different forest types in Germany, each 1 ha in size, we tested the performance of...
#1Melissa Stiers (GAU: University of Göttingen)H-Index: 3
#2Peter Annighöfer (TUM: Technische Universität München)
Last. Christian Ammer (GAU: University of Göttingen)H-Index: 29
view all 6 authors...
Abstract Continuous cover forestry is often considered a management alternative to age-class forestry, in closer compliance with economic as well as societal demands. It is further thought to provide forest stands of high stability and resilience under conditions of climate change. The guiding principle for the stand structure of continuous cover forestry systems is to create managed forest stands that are multi-layered and hence of high structural diversity. Past studies of both these character...
#1Eike FeldmannH-Index: 6
#2Jonas GlatthornH-Index: 6
Last. Christoph LeuschnerH-Index: 55
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The frequency and size of canopy gaps largely determine light transmission to lower canopy strata, controlling structuring processes in the understory. However, quantitative data from temperate virgin forests on the structure of regeneration in gaps and its dynamics over time are scarce. We studied the structure and height growth of tree regeneration by means of sapling density, shoot length growth and cumulative biomass in 17 understory gaps (29 to 931 m2 in size) in a Slovakian beech (Fagus sy...
#1Nathaly Guerrero-Ramirez (GAU: University of Göttingen)H-Index: 1
#2Liesje Mommer (WUR: Wageningen University and Research Centre)H-Index: 37
Last. Thomas W. Kuyper (WUR: Wageningen University and Research Centre)H-Index: 43
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Motivation: Trait data are fundamental to quantitatively describe plant form and function. Although root traits capture key dimensions related to plant responses to changing environmental conditions and effects on ecosystem processes, they have rarely been included in large-scale comparative studies and global models. For instance, root traits remain absent from nearly all studies that define the global spectrum of plant form and function. Thus, to overcome conceptual and methodological roadbloc...
1 CitationsSource
#1Peter Schall (GAU: University of Göttingen)H-Index: 20
#2Steffi Heinrichs (GAU: University of Göttingen)H-Index: 11
Last. Ernst Detlef Schulze (MPG: Max Planck Society)H-Index: 117
view all 14 authors...
#1M. Mund (GAU: University of Göttingen)H-Index: 20
#2Mathias HerbstH-Index: 14
Last. Christian Ammer (GAU: University of Göttingen)H-Index: 29
view all 9 authors...
Controls on tree growth are key issues in plant physiology. The hypothesis of our study was that the interannual variability of wood and fruit production are primarily controlled directly by weather conditions (sink limitation), while carbon assimilation (source limitation) plays a secondary role. We analyzed the interannual variability of weather conditions, gross primary productivity (GPP) and net primary productivity (NPP) of wood and fruits of an old-growth, unmanaged Fagus sylvatica forest ...
1 CitationsSource
#2Christian AmmerH-Index: 29
Last. Peter AnnighöferH-Index: 15
view all 3 authors...
Rare or endangered tree species are important components of forest ecosystems and play a crucial role in management and conservation. Understanding what influences their presence is critical for managers, conservationists and planners. This study presents results of a comprehensive inventory of the tree species and site characteristics in the Vietnamese Cat Ba National Park (CBNP). An adaptive cluster sampling technique was applied to study the effect of human disturbance, soil properties, and t...