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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 11 to 20 of 21 (0.044 seconds)Spelling suggestions: "subject:"cilia"" "subject:"filia""
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Species-specific fine root biomass, morphology and dynamics of six co-occurring deciduous tree species in the Hainich National Park and a conifer tree species at the alpine treelineKubisch, Petra 09 September 2015 (has links)
No description available.
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| 12 |
A GIS MODEL FOR APIARY SITE SELECTION BASED ON PROXIMITY TO NECTAR SOURCES UTILIZED IN VARIETAL HONEY PRODUCTION ON FORMER MINE SITES IN APPALACHIAPotter, Douglass W. 01 January 2019 (has links)
Beekeepers in Appalachia market varietal honeys derived from particular species of deciduous trees; however, finding places in a mountainous landscape to locate new beeyards is difficult. Site selection is hindered by the high up-front costs of negotiating access to remote areas with limited knowledge of the available forage. Remotely sensed data and species distribution modeling (SDM) of trees important to beekeepers could aid in locating apiary sites at the landscape scale. The objectives of this study are i) using publicly available forest inventory data, to model the spatial distribution of three native tree species that are important to honey producers in eastern Kentucky: American Basswood, Sourwood and Tulip Poplar, and to assess the accuracy of the models, ii) to incorporate a method for discounting the value of a nectar resource as a function of distance based on an energetic model of honeybee foraging, and iii) to provide an example by ranking potential apiary locations around the perimeter of a mine site in the study area based on their proximity to probable species habitat using a GIS model.
Logistic regression models were trained using presence-absence records from 1,059 USFS Forest Inventory and Analysis (FIA) sub-plots distributed throughout a 9,000 km2 portion of the Kentucky River watershed. The models were evaluated by applying them to a separate dataset, 950 forest inventory sub-plots distributed over a 40.5 km2 research forest maintained by the University of Kentucky. Weights derived from an energic model of honeybee foraging were then applied to the probabilities of tree species occurrence predicted by the SDM. As an example, 24 potential apiary locations around the perimeter of a reclaimed mine site were selected and then ranked according to a site suitability index. Three tributary areas corresponding to different honeybee flight ranges were considered: 500m, 700m, and 1,200m. Results confirm that rankings are dependent on the foraging range considered, suggesting that the number of colonies at an apiary location would be an important factor to consider when choosing a site. However, the methodology makes assumptions that are only anecdotally supported, notably i) that colonies will forage preferentially at the target species when it is in bloom and, ii) that foragers will exhaust resources closest to the hive first, regardless of patch size. Additional study of how bees deplete the nectar resources surrounding an apiary is needed to verify the usefulness of SDM in site selection for varietal honey production.
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Spatial variation of photosynthetic capacity of early-, mid-, or late-successional broad-leaved tree species in a temperate mixed forestLegner, Nicole 23 March 2012 (has links)
No description available.
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Accelerated Pot-in-Pot using Double Cropped Retractable Roof Greenhouse Grown Tree LinersRivera, Dania 17 December 2010 (has links)
No description available.
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Fine root dynamics in broad-leaved deciduous forest stands differing in tree species diversity / Die Feinwurzeldynamik in unterschiedlich baumartenreichen LaubwäldernMeinen, Catharina 23 September 2008 (has links)
No description available.
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Hydraulic traits and their relevance for water use strategies in five broad-leaved tree species of a temperate mixed forestKöcher, Paul 21 November 2012 (has links)
No description available.
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| 17 |
Effects of tree species composition on fine root biomass and dynamics in the rhizosphere of deciduous tree stands in the Hainich National Park (Thuringia) / Effects of tree species composition on fine root biomass and dynamics in the rhizosphere of deciduous tree stands in the Hainich National Park (Thuringia)Jacob, Andreas 21 November 2012 (has links)
No description available.
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MAŽALAPĖ LIEPA (Tilia cordata Mill.) LIETUVOJE: FENOTIPINĖ ĮVAIROVĖ IR MODALINIŲ MEDYNŲ NAŠUMAS / SMALL-LEAVED LIME (Tilia cordata Mill.) IN LITHUANIA: PHENOTYPICAL DIVERSITY AND PRODUCTIVITY OF MODAL STANDSSemaškienė, Loreta 07 June 2006 (has links)
This doctoral dissertation has been accomplished during the period of 1995-2006 in the Department of Forestry at the Lithuanian University of Agriculture. In Lithuanian forests only one species of genus - small-leaved lime (Tilia cordata Mill.) – is natural. Study aim was to determine the distribution of lime stands in Lithuania, estimate their productivity and phenotypic variation. For the first time distribution of lime stands in different natural forest regions of Lithuania has been analysed. For the first time studies of the phenotypical diversity were conducted, phenotypical diversity in natural stands has been analysed. Phenological forms of small-leaved lime were singled out, their development differences were justified. Yield models for all lime stand sites and site productivity scale for lime stands were designed.For the first time data on the diversity of phenotypical traits and on the influence of environmental factors on phenotypical indices of lime trees were analysed in Lithuanian stands of natural origin. The data may be applied to estimate the possibilities of lime growth in different conditions, forecasting stand productivity. The data on phenotypic diversity may be important to preserve genetic diversity of naturally growing lime stands. For the first time the distribution of lime stands, their species composition in natural forest regions of Lithuania and in different sites were analysed. Yield models of modal stands and site productivity scales for lime... [to full text]
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Water turnover in species-rich and species-poor deciduous forests: xylem sap flow and canopy transpiration / Wasserumsatz in artenreichen und artenarmen Laubwäldern: Xylemsaftfluss und Kronendach-TranspirationGebauer, Tobias 20 February 2009 (has links)
No description available.
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Walddynamik in Mischwäldern des Nationalparks Hainich / Forest Dynamics and Species Interaction in a mixed broad-leaved Forest in the Nationalpark Hainich (Thuringia)Frech, Annika 03 May 2006 (has links)
No description available.
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