Global ETD Search

351	Effects of increased nitrogen input on the net primary production of a tropical lower montane rain foest, Panama / Auswirkungen erhöhter Stickstoffzufuhr auf die Netto-Primärproduktion eines tropischen Bergregenwaldes in Panama Adamek, Markus 18 June 2009 (has links) No description available. 570 Biowissenschaften Biologie Forest Sciences and Forest Ecology Stickstoffdüngung tropischer Bergregenwald Netto-Primärproduktion überirdische Holzproduktion Streufall Feinwurzel-Produktion sequential coring ingrowth cores Kohlenstoff-Festlegung Eschweilera panamensis Oreomunnea mexicana Vochysia guatemalensis Panama N fertilization tropical lower montane rain forest net primary production above-ground woody biomass production litterfall fine root production sequential coring ingrowth cores carbon sequestration Eschweilera panamensis Oreomunnea mexicana Vochysia guatemalensis Panama 42.44 42.91 WNA 250: Wald Urwald {Biologie Ökologie} WNA 500: Tropische Biotope {Biologie Ökologie}
352	Wood Quality, Carbon and Nitrogen Partitioning, and Gene Expression Profiling in <i>Populus</i> Exposed to Free Air CO<sub>2</sub> Enrichment (FACE) and N-fertilization / Auswirkungen von CO<sub>2</sub>-angereicherter Luft im Freiland (FACE) und zusätzlicher Stickstoffdüngung auf die Holzqualität, Kohlenstoff- und Stickstoffverteilung, sowiedie Genexpression bei Pappeln Luo, Zhibin 19 December 2005 (has links) No description available. 580 Pflanzen (Botanik) Forest Sciences and Forest Ecology Holzwirtschaft Biomasse Brennwert Klimaveränderung FT-IR Genexpression Lignin Stickstoffdüngung lösliche Proteine Phenole Zucker Stärke Tannine Holzanatomie Holzeigenschaften Pappel Agroforestry Biomass Calorific value Carbon sequestration Climate change Elevated CO<sub>2</sub> FT-IR Gene expression Lignin N-fertilization Phenolics Soluble proteins Starch Sugar Tannins Wood anatomy Wood properties <i>Populus</i> 48.99 YQE 000: Physiologie {Forstbotanik} YQO 000: Ökologie {Forstbotanik}
353	Quantitative Agricultural Policy Impact Analysis at Enhanced Farm & Regional Resolution Gocht, Alexander 18 June 2024 (has links) In dieser Habilitationsschrift werden elf ausgewählte Zeitschriftenartikel vorgestellt. Alle Artikel zielen darauf ab, die Heterogenität der Betriebe des Agrarsektors durch eine bessere Auflösung der Angebotsmodelle zu berücksichtigen. Der erste Abschnitt konzentriert sich auf die Anwendungen mit dem partiellen Gleichgewichtsmodell CAPRI. Der Abschnitt deckt ein breites Spektrum politischer Fragen ab, zum Beispiel, Kopplung bzw. Konvergenz der Direktzahlungen, Ökologisierung, Verringerung der Treibhausgasemissionen und Kohlenstoffsequestrierung. Ich zeige, dass betriebsbezogene Angebotsmodelle eine detailliertere Analyse politischer Auswirkungen ermöglichen. Zudem erlauben diese Angebotsmodelle eine Verknüpfung mit Modellen höherer räumlicher Auflösung. Der zweite Abschnitt befasst sich mit methodischen Fragen zur Schätzung struktureller Veränderungen auf der Ebene der Betriebstypen in einem EU-weiten Ansatz. Der entwickelte Ansatz hilft, Faktoren, die den landwirtschaftlichen Strukturwandel beeinflussen, besser zu bestimmen und bietet die Möglichkeit einer umfassenden Analyse des landwirtschaftlichen Strukturwandels in der EU. Es wird gezeigt, dass die Ergebnisse zum Strukturwandel auch in der Modellierung berücksichtigt werden können. Dafür wurden Methoden entwickelt, die die Wahrung der Konsistenz der regionalen Ebene und die Berücksichtigung von betriebstypspezifischen Bilanzen, Indikatoren und Veränderungen in der Zahl der landwirtschaftlichen Betriebe gewähren. Der letzte Abschnitt befasst sich mit Methoden zur Rückschätzung von zensierten Daten. Ich untersuche verschiedene Datenaggregationsansätze, wie zum Beispiel, ein lokales gewichtetes Durchschnittsverfahren und ein bayesianisches Schätzverfahren, um Parameter für die zensierten Daten zu ermitteln, die der Realität so weit wie möglich entsprechen. / In this habilitation thesis, eleven selected journal articles were presented. All articles aimed to improve the resolution and thus reduce aggregation error to better account for farm heterogeneity in the agricultural sector models. The first section focused on model application with the partial equilibrium model CAPRI at the farm-type level. It covered many policy issues, such as coupling, convergence, greening, GHG mitigation, and carbon sequestration. I demonstrate that the farm-type supply models enable a detailed analysis of various policy impacts. It was demonstrated that the EU's supply models could improve model linkage with higher spatial resolution models, thus further closing the gap with spatial land-use models. The second section addressed significant methodological queries about estimating structural changes at the farm-type level in an EU-wide approach. A regional approach helps to identify better factors affecting agricultural structural change. The approach offers the opportunity for a comprehensive and previously unachievable analysis of agricultural structural change in the EU. Integrating the development into the CAPRI farm-type model poses challenges with the top-down approach. It requires maintaining consistency with the regional NUTS2 level and considering farm-type-specific balances, indicators, and changes in the number of farms from the structural change estimation. The last section addressed methods for back-estimating censored data. I explored different data aggregation approaches, such as a local weighted average method and a Bayesian estimation procedure, to establish parameters for the censored data that match reality as closely as possible. Einkommensverteilungseffekte GAP-Reform Modellierung auf Betriebsebene Direktzahlungen Bodenrenten Anbaudiversifizierung Betriebsmodell Dauergrünland Kohlenstoffbindung Treibhausgasemissionen Produktivitätsanalyse Ländliche und regionale Entwicklung Genom-Editierung Handelsverzerrung Betrieblicher Strukturwandel Produktionsspezialisierung Betriebsstandort Baseline Betriebstypologien Highest Posterior Density Estimation Zensusdaten Clusteranalyse Income distributional effects CAP reform Farm-level modeling Direct payments Land rents Crop diversification Ecological focus area Economic and environmental impacts Farm model Permanent grassland Carbon sequestration Greenhouse gas emissions Productivity analysis Rural and regional development Genome editing Trade distortion Farm structural change Production specialization Farm location Baseline Farm typologies Highest posterior density Data protection regulation Census data ZB 56200 ZB 56500 QS 700 ddc:630
354	Multispectral imaging of Sphagnum canopies: measuring the spectral response of three indicator species to a fluctuating water table at Burns Bog Elves, Andrew 02 May 2022 (has links) Northern Canadian peatlands contain vast deposits of carbon. It is with growing urgency that we seek a better understanding of their assimilative capacity. Assimilative capacity and peat accumulation in raised bogs are linked to primary productivity of resident Sphagnum species. Understanding moisture-mediated photosynthesis of Sphagnum spp. is central to understanding peat production rates. The relationship between depth to water table fluctuation and spectral reflectance of Sphagnum moss was investigated using multispectral imaging at a recovering raised bog on the southwest coast of British Columbia, Canada. Burns Bog is a temperate oceanic ombrotrophic bog. Three ecohydrological indicator species of moss were chosen for monitoring: S. capillifolium, S. papillosum, and S. cuspidatum. Three spectral vegetation indices (SVIs) were used to characterize Sphagnum productivity: the normalized difference vegetation index 660, the chlorophyll index, and the photochemical reflectance index. In terms of spectral sensitivity and the appropriateness of SVIs to species and field setting, we found better performance for the normalized difference vegetation index 660 in the discrimination of moisture mediated species-specific reflectance signals. The role that spatiotemporal scale and spectral mixing can have on reflectance signal fidelity was tested. We were specifically interested in the relationship between changes in the local water table and Sphagnum reflectance response, and whether shifting between close spatial scales can affect the statistical strength of this relationship. We found a loss of statistical significance when shifting from the species-specific cm2 scale to the spectrally mixed dm2 scale. This spatiospectral uncoupling of the moisture mediated reflectance signal has implications for the accuracy and reliability of upscaling from plot based measurements. In terms of species-specific moisture mediated reflectance signals, we were able to effectively discriminate between the three indicator species of Sphagnum along the hummock-to-hollow gradient. We were also able to confirm Sphagnum productivity and growth outside of the vascular growing season, establishing clear patterns of reflectance correlated with changes in the local moisture regime. The strongest relationships for moisture mediated Sphagnum productivity were found in the hummock forming species S. capillifolium. Each indicator Sphagnum spp. of peat has distinct functional traits adapted to its preferred position along the ecohydrological gradient. We also discovered moisture mediated and species-specific reflectance phenologies. These phenospectral characteristics of Sphagnum can inform future monitoring work, including the creation of a regionally specific phenospectral library. It’s recommended that further close scale multispectral monitoring be carried out incorporating more species of moss, as well as invasive and upland species of concern. Pervasive vascular reflectance bias in remote sensing products has implications for the reliability of peatland modelling. Avoiding vascular bias, targeted spectral monitoring of Sphagnum indicator species provides a more reliable measure for the modelling of peatland productivity and carbon assimilation estimates. / Graduate peatland peatland restoration peatland monitoring peatland modelling peat peat moss multispectral multispectral imaging multicamera array multitemporal multiple linear regression linear mixed effects Sphagnum sphagna Sphagnum capillifolium Sphagnum papillosum Sphagnum cuspidatum spatiospectral uncoupling near-sensing remote sensing phenospectral phenology phenologies phenospectral bias phenospectral libraries carbon assimilation carbon dioxide carbon dynamics carbon emissions carbon geographies carbon mineralization carbon sequestration carbon source carbon sink carbon storage irrecoverable carbon climate forcing methane Ecological Restoration restoration ecology ecohydrology ecohydrological restoration hydrology ecohydrological gradients ecological integrity reflectance nature based solutions ombrotrophic moss raised peatland mires mires photochemical reflectance index normalized difference vegetation index chlorophyll index climate change climate forcing climate envelope climatope nonvascular vascular bias plant functional type plant functional types structure equation models spectral vegetation indices hummock hollow acrotelm catotelm diplotelmic biocrusts organic soil periodicity moisture deficit senescence rejuvenescence productivity photosynthesis light use efficiency photosynthetic function photosynthetically active radiation water table hydrology rewetting depth to water table landscape change landscape degradation peat subsidence Burns Bog

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