Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
8 Ergebnisse
Antonius Amm,
Alexandra Nicola Egger,
Prof. Dr. Klaus Menrad,
Miriam Wolf,
Dr. Corinna Urmann,
Dr. Agnes Emberger-Klein
Phillip Papastefanou,
Prof. Dr. Christian Zang,
Zlatan Angelov,
Aline Anderson de Castro,
Juan Carlos Jimenez,
Luiz Felipe Campos De Rezende,
Romina Ruscica,
Boris Sakschewski,
Anna A. Sörensson,
Kirsten Thonicke,
Carolina Vera,
Nicolas Viovy,
Celso von Randow,
Prof. Dr. Anja Rammig
Over the last decades, the Amazon rainforest has been hit by multiple severe drought events. Here, we assess the severity and spatial extent of the extreme drought years 2005, 2010 and 2015/16 in the Amazon region and their impacts on the regional carbon cycle. As an indicator of drought stress in the Amazon rainforest, we use the widely applied maximum cumulative water deficit (MCWD). Evaluating nine state-of-the-art precipitation datasets for the Amazon region, we find that the spatial extent of the drought in 2005 ranges from 2.2 to 3.0 (mean =2.7) ×106 km2 (37 %–51 % of the Amazon basin, mean =45 %), where MCWD indicates at least moderate drought conditions (relative MCWD anomaly ). In 2010, the affected area was about 16 % larger, ranging from 3.0 up to 4.4 (mean =3.6) ×106 km2 (51 %–74 %, mean =61 %). In 2016, the mean area affected by drought stress was between 2005 and 2010 (mean km2; 55 % of the Amazon basin), but the general disagreement between datasets was larger, ranging from 2.4 up to 4.1×106 km2 (40 %–69 %). In addition, we compare differences and similarities among datasets using the self-calibrating Palmer Drought Severity Index (scPDSI) and a dry-season rainfall anomaly index (RAI). We find that scPDSI shows a stronger and RAI a much weaker drought impact in terms of extent and severity for the year 2016 compared to MCWD. We further investigate the impact of varying evapotranspiration on the drought indicators using two state-of-the-art evapotranspiration datasets. Generally, the variability in drought stress is most dependent on the drought indicator (60 %), followed by the choice of the precipitation dataset (20 %) and the evapotranspiration dataset (20 %). Using a fixed, constant evapotranspiration rate instead of variable evapotranspiration can lead to an overestimation of drought stress in the parts of Amazon basin that have a more pronounced dry season (for example in 2010). We highlight that even for well-known drought events the spatial extent and intensity can strongly depend upon the drought indicator and the data sources it is calculated with. Using only one data source and drought indicator has the potential danger of under- or overestimating drought stress in regions with high measurement uncertainty, such as the Amazon basin.
In the wake of the decarbonisation of the entire economy, the use of peat in horticulture is under increasing pressure. In Germany, wood fibre is by far the most important substitute in growing media for professional horticulture. However, due to readily microbial degradability and a wide C:N ratio, nitrogen immobilization is a major problem of wood fibre products and considerably limits their use. Concurrently, stability of wood fibre is assessed by incubation experiments in which the change of mineral nitrogen is measured. However, these experiments have three shortcomings: First, they are quite labour and time-consuming as incubation period is up to 21 days. Second, if long-term fertilizers – especially urea-aldehyde condensation products – are applied by the manufacturer, the experiments only provide information about the stability of the N balance, but not about the stability of the material itself. Third, comparability and repeatability of the incubation experiments are rather poor. To overcome these shortcomings new approaches to evaluate stability of wood fibre were tested.The setup of the first approach is similar to the currently used incubation experiments. However, the incubation period is only five days and additionally to change in mineral nitrogen from the beginning to the end of the experiment, carbon mineralization is analysed continuously by Oxitop®-C measuring heads. The second approach focusses on the characterization of readily decomposable nitrogen and carbon fractions in the wood fibre. On the one hand, hydrolysable nitrogen and carbon is measured and on the other hand, a stepwise thermal fractionation of carbon under pyrolytic conditions is done. The results of the two approaches are compared to nitrogen immobilization measured in common incubation experiments and further validated by nitrogen balances deduced form short-term pot experiments with Chinese cabbage.
Mehr
Ivonne Jüttner,
Nicolas Mauser,
Eleonora Itri,
Prof. Dr. Heike Susanne Mempel
Development of an indoor farming cultivation process for Rhodiola rosea, using an aeroponic and deep-water irrigation method (2022) 31. International Horticultural Congress (IHC2022); International Symposium on advances in Vertical Farming .
Ivonne Jüttner,
B.Sc. Julian Hecht,
Prof. Dr. Heike Susanne Mempel
Influence of different light spectra on growth and quality of Rosmarinus officinalis cultivars in a deep- water vertical indoor farming system (2022) 31. International Horticultural Congress (IHC2022): International Symposium on Advances in Vertical Farming .
Ivonne Jüttner,
Prof. Dr. Heike Susanne Mempel
Pulsed light − optimal ratio between yield and energy reduction (2022)
Ivonne Jüttner,
Prof. Dr. Heike Susanne Mempel
Fruit vegetables in indoor farming – potential of chili pepper production (2022) 31. International Horticultural Congress (IHC2022): International Symposium on Advances in Vertical Farming .
Betreuung der Publikationsseiten
Gerhard Radlmayr
Referent für Wissenstransfer und Forschungskommunikation
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