Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"Tree Height"”.
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… was designed to collect long-term understory tree growth data under a broad range of conditions, with the objective of separately evaluating the effects of site quality, overstory retention, and understory competition levels on tree height growth. After four years, mean periodic annual height …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… was designed to collect long-term understory tree growth data under a broad range of conditions, with the objective of separately evaluating the effects of site quality, overstory retention, and understory competition levels on tree height growth. After four years, mean periodic annual height …
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Minimum tree height sample sizes necessary for accurately estimating merchantable plot volume in Loblolly pine plantations
The minimum number of tree heights that are necessary, with a probability of 0.95, to obtain a merchantable plot volume estimate of loblolly pine within ± 3, 5, and 10% of the volume observed if all plot trees had been measured for height were determined for all combinations of volume estimation …
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African savanna elephant (Loxodonta africana) impacts on vegetation in a fenced area and the broader implications for elephant conservation.
… savanna elephants (Loxodonta africana) impacted tree species in the small, fenced Karongwe Private Game Reserve (KPGR), South Africa and to determine levels of tree recovery. Trees in high-use areas were significantly less likely to show signs of debarking and push over. Tall trees were …
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Growth of juvenile lodgepole pine in relation to soil and slope
The thesis is concerned with determining site-tree growth relationships that exist in pure evenage juvenile stands of lodgepole pine. The study is a basis for developing methods that will eventually predict site productivity. A pure evenage stand of lodgepole pine 18 to 20 years in age was chosen …
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Live crown ratio model and lumber recovery for intensively managed loblolly pine
… including thinning and sometimes pruning. Tree crowns contain the active photosynthesis region and play a vital role in tree growth. Among various tree crown measurements, live crown ratio (LCR) is derived from height to live crown base (HLCB) and total tree height. Accurate measurement of …
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Response of marula to simulated browsing on a productivity gradient
… birrea) is a heavily utilisedsavannah tree species and is widely used by people and animals for its leaves, bark, fruits and roots. Because of its importance in terms of economy, ecology, cultural values and dominance in some low veld areas of South Africa, it is therefore of importance …
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THE INFLUENCE OF ENVIRONMENTAL VARIABLES ON THE HEIGHT GROWTH OF LOBLOLLY PINE (Pinus taeda) IN THE WESTERN GULF
… the effects of soil and climate factors on the height growth (site index) of loblolly pine (<em>Pinus Taeda L.</em>) using data collected from permanent plots established in intensively-managed plantations across East Texas and Western Louisiana. The Chapman-Richards model was selected as the …
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Using a ground-based lidar instrument (Echidna ®) to reconstruct three-dimensional forest structure for biophysical and ecological studies
… forest structural parameters that include tree diameter at breast height (DBH), tree height, crown diameter, crown height, and foliage area volume density (FA VD), that agree with field measurements and by airborne lidar data. I generate a fine-resolution digital terrain model (DTM) and …
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ΔΙΑΚΥΜΑΝΣΗ ΤΩΝ ΔΟΜΙΚΩΝ ΧΑΡΑΚΤΗΡΩΝ ΤΟΥ ΞΥΛΟΥ ΤΟΥ ΚΥΠΑΡΙΣΣΙΟΥ (CUPRESSUS SEMPERVIRENS L.) ΣΤΗΝ ΕΛΛΑΔΑ
… SAMOS) AND IN A PLANTATION (PELOPONNESE) WITH TREES OF BOTH VARIETIES WAS STUDIED . FOUR TREES WERE CUT FROM EACH REGION AND VARIETY. IN EACH TREE, SAMPLE BILLETS WERE TAKEN FROM FOUR HEIGHT LEVELS (5%, 15%, 35% ΑΝΔ 65%) OFTHE TOTAL TREE HEIGHT. TWO RADII WERE SELECTED IN EACH SAMPLE BILLET AND …
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Estimation of biophysical properties of woodland canopies using LiDAR and hyperspectral imagery
… The studyaimed to retrieve woodland stand height, LAI and canopy cover from the two sensortypes at Delamere Forest, located in North West England. The data were collectedbetween March 2008 and March 2009 in needle leaved evergreen, needle leaveddeciduous and mixed broad leaved deciduous …
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Estimating Plot-Level Forest Biophysical Parameters Using Small-Footprint Airborne Lidar Measurements
… biophysical parameters measuring individual trees identifiable on the three-dimensional lidar surface. This study derived the digital terrain model from lidar data using an iterative slope-based algorithm and developed processing methods for directly measuring tree height, crown diameter, and …
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Extensive Huffman-tree-based neural network for the imbalanced dataset and its application in accent recognition
… this thesis proposed an Extensive Huffman-Tree Neural Network (EHTNN), which fabricates multiple component neural network-enabled classifiers (e.g., CNN or SVM) using an extensive Huffman tree. Any given node in EHTNN can have arbitrary number of children. Compared with the Binary …
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Winter movements and habitat use of northern saw-whet owls at Assateague Island, Maryland
… included number of stems 2.5 cm DBH, roost tree height, roost tree species, canopy cover, average canopy height, average shrub height, roost DBH, distance to nearest tree, and percent ground cover. Vegetation also was measured at a random in similar habitat. Logistic regression was used to …
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Ecological Enhancement of Timber Growth: Applying Compost to Loblolly Pine Plantations
… of compost onto a small loblolly pine tree forest in northeast Texas. Its purpose was to determine if the application of various amounts of compost would provide for accelerated rates of growth for the trees. Soil parameters were also monitored. A total of 270 trees were planted and …
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Comparison of the Survival and Growth of West Gulf Coastal Plain Pine in East Texas
… survival in Houston and Shelby counties. Tree heights were greater in loblolly and slash pine than in shortleaf and longleaf pine, while diameters were greater in loblolly than slash and shortleaf pine, which where greater than longleaf diameters. Height and survival rates were greater in …
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Canopy transpiration of beech forests in Northern Bavaria – Structure and function in pure and mixed stands with oak at colline and montane sites
Mixed stands of broadleaved deciduous tree species are increasing in importance in Bavaria and all of Germany, especially in the context of climate change, forest conversion and sustainable forestry. Very few investigations to date have quantified the canopy transpiration of mixed forest stands, …
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EFFECT OF MYCORRHIZAE INOCULATION ON THE GROWTH AND SUCCESS OF THREE TAXODIUM DISTICHUM HYBRIDS IN SALINE - IMPACTED COASTAL SOILS
… fertilizer application. A total of sixty (60) trees planted in plots of three rows and divided into five randomized replication blocks of four treatments each were used. Plants were measured for total height and diameter at breast height (DBH), and tree leaf nutrient concentration over the 2021 …
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Irrigation of acacia and eucalyptus species with waters of different salinities in a semi-arid environment in Formentera, Balearic Islands
… whether good growth rates could be obtained for trees in a semi-arid environment (Formentera, Balearic Islands) using small quantities of highly saline irrigation water. Soil improvement and avoidance of detrimental long term effects was a prime objective. Two species, Eucalyptus gomphocephala …
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Fire survival and life histories of Acacia and Dichrostachys species in a South African savanna
The tree-grass mix defines savannas, yet savannas can be defined as ecosystems that move between transition states of grass and bush, the dynamics of which are complex, being affected by a number of biotic and abiotic factors. Recently there has been renewed interest in fire and its role in shaping …
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