Florian Hofhansl
A5020943285- Soil Carbon and Nitrogen Dynamics
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Plant Water Relations and Carbon Dynamics
- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Remote Sensing and LiDAR Applications
- Plant and animal studies
- Conservation, Biodiversity, and Resource Management
- Remote Sensing in Agriculture
- Forest Ecology and Biodiversity Studies
- Plant responses to elevated CO2
- Land Use and Ecosystem Services
- Botany and Plant Ecology Studies
- Environmental and biological studies
- Geology and Paleoclimatology Research
- Species Distribution and Climate Change
- Forest Management and Policy
- Lichen and fungal ecology
- Phytase and its Applications
- Soil Management and Crop Yield
- Agricultural risk and resilience
- Tree-ring climate responses
- Microbial Community Ecology and Physiology
- Climate variability and models
International Institute for Applied Systems Analysis
2015-2025
University of Vienna
2010-2019
Swiss Federal Institute for Forest, Snow and Landscape Research
2018
National Institute of Amazonian Research
2015-2016
Microbial nitrogen use efficiency (NUE) describes the partitioning of organic N taken up between growth and release inorganic to environment (that is, mineralization), is thus central our understanding cycling. Here we report empirical evidence that microbial decomposer communities in soil plant litter regulate their NUE. We find microbes retain most immobilized (high NUE), when they are limited, resulting low mineralization. However, metabolic control decomposers switches from C limitation,...
Abstract Species‐rich plant communities have been shown to be more productive and exhibit increased long‐term soil organic carbon (SOC) storage. Soil microorganisms are central the conversion of matter into SOC, yet relationship between diversity, microbial growth, turnover as well use efficiency (CUE) SOC accumulation is unknown. As heterotrophic microbes primarily limited, it important understand how they respond plant‐derived inputs at higher species richness (PSR). We used grassland...
Biochar production and subsequent soil incorporation could provide carbon farming solutions to global climate change escalating food demand. There is evidence that biochar amendment causes fundamental changes in nutrient cycles, often resulting marked increases crop production, particularly acidic infertile soils with low organic matter contents, although comparable outcomes temperate are variable. We offer insight into the mechanisms underlying these findings by focusing attention on...
Resource stoichiometry (C:N:P) is an important determinant of litter decomposition. However, the effect elemental on gross rates microbial N and P cycling processes during decomposition unknown. In a mesocosm experiment, beech (Fagus sylvatica L.) with natural differences in was incubated under constant environmental conditions. After three six months, we measured various aspects nitrogen phosphorus cycling. We found that protein depolymerization, mineralization (ammonification),...
One of the best-known general patterns in island biogeography is species-isolation relationship (SIR), a decrease number native species with increasing isolation that linked to lower rates natural dispersal and colonization on remote oceanic islands. However, during recent centuries, anthropogenic introduction alien has increasingly gained importance altered composition richness pools. We analyzed large dataset for plants, ants, reptiles, mammals, birds 257 (sub) tropical islands, showed...
The global carbon and water cycles are governed by the coupling of CO2 vapour exchanges through leaves terrestrial plants, controlled plant adaptations to balance gains hydraulic risks. We introduce a trait-based optimality theory that unifies treatment stomatal responses biochemical acclimation plants environments changing on multiple timescales. Tested with experimental data from 18 species, our model successfully predicts simultaneous decline in assimilation rate, conductance...
Abstract Spatially explicit information on forest management at a global scale is critical for understanding the status of forests, planning sustainable and restoration, conservation activities. Here, we produce first reference data set prototype globally consistent map with high spatial detail most prevalent classes such as intact managed forests natural regeneration, planted plantation (rotation up to 15 years), oil palm plantations, agroforestry. We developed dataset 226 K unique...
Predicted changes in the intensity and frequency of climate extremes urge a better mechanistic understanding stress response microbially mediated carbon (C) nutrient cycling processes. We analyzed resistance resilience microbial C, nitrogen (N), phosphorus (P) processes community composition decomposing plant litter to transient, but severe, temperature disturbances, namely, freeze-thaw heat. Disturbances led temporarily more rapid C N caused down-regulation P cycling. In contrast fast...
Drought stress hampers plant energy and biomass production; however it is still unknown how internal C:N balance rhizobial symbiosis impact on response to water limitation. Here, the effect of differential optimal nitrogen nutrition root nodule drought rehydration responses Medicago truncatula was assessed. Two groups plants were nodulated with Sinorhizobium medicae or meliloti--differing in performance N fixation; third group grew a rhizobia-free medium received mineral fertilizer. In...
Enzyme-mediated decomposition of soil organic matter (SOM) is controlled, amongst other factors, by properties and the microbial decomposer community present. Since composition SOM are often interrelated both change with depth, drivers enzymatic hard to dissect. We investigated soils from three regions in Siberian Arctic, where carbon rich topsoil material has been incorporated into subsoil (cryoturbation). took advantage this subduction test if shape composition, identify controls on enzyme...
Abstract Tropical rainforests harbor exceptionally high biodiversity and store large amounts of carbon in vegetation biomass. However, regional variation plant species richness stock can be substantial, may related to the heterogeneity topoedaphic properties. Therefore, aboveground storage typically differs between geographic forest regions association with locally dominant functional group. A better understanding underlying factors controlling tropical diversity could critical for...
Turbic Cryosols (permafrost soils characterized by cryoturbation, i.e., mixing of soil layers due to freezing and thawing) are widespread across the Arctic, contain large amounts poorly decomposed organic material buried in subsoil. This cryoturbated matter exhibits retarded decomposition compared topsoil. Since (SOM) is known be tightly linked N availability, we investigated transformation rates different horizons three tundra sites north-eastern Siberia Greenland. We measured gross protein...
The processes that govern diverse tropical plant communities have rarely been studied in life forms other than trees. Structurally dependent vascular epiphytes, a major part of biodiversity, grow three-dimensional matrix defined by their hosts, but trees differ architecture, bark structure/chemistry and leaf phenology. We hypothesized the resulting seasonal differences microclimatic conditions evergreen vs. deciduous would affect epiphytes at different levels, from organ physiology to...
Forest biomass is an essential indicator for monitoring the Earth's ecosystems and climate. It a critical input to greenhouse gas accounting, estimation of carbon losses forest degradation, assessment renewable energy potential, developing climate change mitigation policies such as REDD+, among others. Wall-to-wall mapping aboveground (AGB) now possible with satellite remote sensing (RS). However, RS methods require extant, up-to-date, reliable, representative comparable in situ data...
Abstract Purpose Large parts of the Amazon rainforest grow on weathered soils depleted in phosphorus and rock-derived cations. We tested hypothesis that this ecosystem, fine roots stimulate decomposition nutrient release from leaf litter biochemically by releasing enzymes, exuding labile carbon stimulating microbial decomposers. Methods monitored a Central tropical rainforest, where were either present or excluded, over 188 days added substrates (glucose citric acid) fully factorial design....
Tropical forests store large amounts of carbon in tree biomass, although the environmental controls on forest stocks remain poorly resolved. Emerging airborne remote sensing techniques offer a powerful approach to understand how aboveground density (ACD) varies across tropical landscapes. In this study, we evaluate accuracy Carnegie Airborne Observatory (CAO) Light Detection and Ranging (LiDAR) system detect top-of-canopy height (TCH) ACD Osa Peninsula, Costa Rica. LiDAR field-estimated TCH...
Litter decomposition is a key process for carbon and nutrient cycling in terrestrial ecosystems mainly controlled by environmental conditions, substrate quantity quality as well microbial community abundance composition. In particular, the effects of climate atmospheric nitrogen (N) deposition on litter its temporal dynamics are significant importance, since their might change over course process. Within TeaComposition initiative, we incubated Green Rooibos teas at 524 sites across nine...
Abstract Purpose The tropical phosphorus cycle and its relation to soil (P) availability are a major uncertainty in projections of forest productivity. In highly weathered soils with low P concentrations, plant microbial communities depend on abiotic biotic processes acquire P. We explored the seasonality relative importance drivers controlling fluctuation common pools via such as litter production decomposition, phosphatase activity. Methods analyzed intra-annual variation using modified...
During December 2020, a crowdsourcing campaign to understand what has been driving tropical forest loss during the past decade was undertaken. For 2 weeks, 58 participants from several countries reviewed almost 115 K unique locations in tropics, identifying drivers of (derived Global Forest Watch map) between 2008 and 2019. Previous studies have produced global maps loss, but current increased resolution sample size across tropics provide more accurate mapping crucial factors leading loss....