Global ETD Search

691	Long term restoration effects : Effects of restoration measures on restoration success in nature reserves in acidic fen, buffered fen, dry heather, wet heather, and wet grassland in Drenthe, Netherlands Nyström, Erika January 2020 (has links) Habitat degradation, fragmentation and loss are important factors causing loss in biodiversity and red listed species, and restoring habitats is essential in preventing this. However, there is a limited knowledge of the long term effects of restoration measures. This study focuses on analysing the long term restoration success of restoration measures carried out in a restoration program between the 1980's and early 2000's in locations of acidic fen, buffered fen, dry heather, wet heather, and wet grassland. The aim of the restoration program was to diminish the effects on ecosystems that were influenced by eutrophication, acidification, and dehydration. The locality species composition and Ellenberg values of nitrogen (EVN), moisture (EVM) and pH levels (EVpH) are analysed, by using previous and current restoration success scores from 54 locations in the province of Drenthe in the Netherlands. The dependence of restoration success score and Ellenberg values on change over time, habitat type, restoration method and EVN, EVM and EVpH are analysed. Restoration success depended on habitat type, with wet heather having significantly higher success compared to wet grasslands. The change in score over time, however, did not vary among habitats. Restoration success did not depend on restoration method(s), nor did change in restoration success. Ellenberg values varied among habitat types, and EVM changed significantly over time in dry heather, but was not significantly related to restoration success score. In conclusion, wet heather was shown to be doing quite well, but could benefit from additional restoration. Acidic fen, buffered fen, dry heather, and wet grassland have all shown poor long term restoration effects, indicating an overall need for further restoration measures. The results also highlight the importance of further studies into the effect of long term restorations, especially focused on finding successful restoration methods, and the importance of detailed data gathered in the field. Acidic fen Acidification Buffered fen Dehydration Dry heather Eutrophication Habitat deterioration Habitat management Moisture Nitrogen Nitrogen deposition pH Red listed species Restoration ecology Restoration method Restoration success Wet grassland Wet heather Ellenberg values nature reserve Mosse kärr hed fukthed fuktäng uttorkning försurning näringsöverskott eutrofiering kväveöverskott kväveregn kvävedeponering surt regn habitatförsämring försämring av naturområden förvaltning av naturområden fukt kväve pH rödlistade arter hotade arter restaurering restaureringsekologi restaureringsmetod restaureringsframgång Ecology Ekologi
692	Comparison between high-resolution aerial imagery and lidar data classification of canopy and grass in the NESCO neighborhood, Indianapolis, Indiana Ye, Nan January 2014 (has links) Indiana University-Purdue University Indianapolis (IUPUI) / Urban forestry is a very important element of urban structures that can improve the environment and life quality within the urban areas. Having an accurate classification of urban forests and grass areas would help improve focused urban tree planting and urban heat wave mitigation efforts. This research project will compare the use of high – resolution aerial imagery and LiDAR data when used to classify canopy and grass areas. The high – resolution image, with 1 – meter resolution, was captured by The National Agriculture Imagery Program (NAIP) on 6/6/2012. Its coordinate system is the North American Datum of 1983 (NAD83). The LiDAR data, with 1.0 – meter average post spacing, was captured by Indiana Statewide Imagery and LiDAR Program from 03/13/2011 to 04/30/2012.The study area is called the Near East Side Community Organization (NESCO) neighborhood. It is located on the east side of downtown Indianapolis, Indiana. Its boundaries are: 65 interstate, East Massachusetts Avenue, East 21st Street, North Emerson Avenue, and the rail road tracks on the south of the East Washington Street. This research will also perform the accuracy assessment based on the results of classifications using high – resolution aerial imagery and LiDAR data in order to determine and explain which method is more accurate to classify urban canopy and grass areas. Eastside (Indianapolis, Ind.)
693	Spinnen in Agrarlandschaften und die biologische Kontrolle von Getreideblattläusen / Spiders in agricultural landscapes and the biological control of cereal aphids Schmidt, Martin H. 27 May 2004 (has links) No description available. Agricultural Sciences Ackerland Ausbreitung Biodiversität Biologische Schädlingsbekämpfung Blattläuse Brache Habitatpräferenz Grünland Landschaftsökologie Mulch natürliche Schädlingskontrolle Ökologischer Landbau Parasitoide Populationsdynamik Prädatoren Räuber-Beute Beziehung räumliche Skala Schlupfwespen Schwebfliegen Spinnen Störung Überwinterung Winterweizen 500 Naturwissenschaften Aphididae Aphidiidae Aphidoletes aphidimyza aphids arable crop Araneida biodiversity biological control dispersal disturbance fallow functional scale geographic information system GIS grassland habitat preference landscape ecology Linyphiidae mulch natural pest control organic farming overwintering parasitoid population dynamics predator Rhopalosiphum padi Sitobion avenae spiders Syrphidae Triticum aestivum trophic interactions wasps winter wheat 48.16 42.65 YA
694	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
695	Das Auftreten acidophiler/calcifuger Pflanzenarten in Kalk-Halbtrockenrasen / The occurence of acidophile/calcifuge plant species in semi-arid calcareous grasslands Fühner, Christoph 02 November 2005 (has links) No description available. 580 Pflanzen (Botanik) WVR 240 Einfluss des Bodens WVE 440 Mineralstoffwechsel WVR 300 Pflanzensoziologie Vegetationskunde Mathematics and Natural Science acidophil basiphil calcicol calcifug Kalk-Halbtrockenrasen Vegetationsdifferenzierung Kalkboden Boden-pH Eisen Phosphor Phosphat Stickstoff Calciumcarbonat Hydrogencarbonat Eisendefizienz Mineralstoffernährung Mineralstoffökologie Nährstoffmangel Nährstoffeffizienz Mineralstofftoxizität Mineralstofftoleranz Ökologie Autökologie Ökophysiologie Synökologie Mineralstoffökologie Symbiose Bodenanalytik Bodenlösung Boden-pH Calluna vulgaris Danthonia decumbens Koeleria pyramidata Potentilla neumanniana Potentilla erecta acidophile basiphile calcicole calcifuge semi-arid calcareous grassland vegetation differentiation calcareous soil soil pH iron phosphorus phosphate nitrogen calcium carbonate bicarbonate iron deficiency mineral nutrition ecology of mineral nutrition nutrient deficiency nutrient efficiency tolerance toxicity ecophysiology ecology ecology of mineral nutrition symbiosis soil analyses soil solution Calluna vulgaris Danthonia decumbens Koeleria pyramidata Potentilla neumanniana Potentilla erecta 42.38 Botanik: Allgemeines 42.44 Pflanzengeographie Pflanzenökologie Pflanzensoziologie

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