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10 results for “stem height”
Forest metrics derived from the 2008 Lidar point clouds, includes canopy closure, percentile height, and stem mapping for the Andrews Experimental Forest.
There are three types of forest metrics within this database. They all are derived from the raw Lidar point clouds using the FUSION software. The three types are canopy closure, height metric, and stem mapping. The canopy closure and height metric grids cover a variety of canopy heights and grid cell sizes. 1. Canopy closure: This metric measures the canopy closure of a given horizontal cell above a given vertical threshold (height break). Canopy closure can inform many landscape models and provide insight on how much light will reach the forest floor. 2. Height Metric: This metric measures the height at which a given percent of the first return points are below. This analysis is done in a given grid cell size. Height metrics give various statistics of the elevation above ground for a given set of Lidar points. In forested landscapes, first return height metrics describe the forest canopy. 3.This stem map locates the approximate center of all trees in the HJ Andrews Research Forest greater than 10 meters. In addition to the stem location, a canopy radius is also provided. FUSION and TreeVaWA software programs were used to develop this data. Watershed Sciences, Inc. (WS) collected Light Detection and Ranging (LiDAR) data from HJ Andrews and the Willamette National Forest (NF) on August 10th and 11th 2008. Total area for this AOI is 17,705 acres. The total area of delivered LiDAR including 100 m buffer is 19,493 acres.
Text-fig. 2. Plot of height versus height to width ratio of leaf scars of the studied species of Protopteris and Oncopteris. in Revision Of Protopteris And Oncopteris Tree Fern Stem Casts From The Late Cretaceous Of Central Europe
Text-fig. 2. Plot of height versus height to width ratio of leaf scars of the studied species of Protopteris and Oncopteris.
Tree stem diameter and height of Araucaria araucana, Nothofagus pumilio and Nothofagus dombeyi in mixed stands affected to different levels by anthropogenic disturbance in south-central Chile
<p><em><strong>Context: </strong></em>Around half of the <em>Araucaria-Nothofagus</em> forests in Chile are affected by anthropogenic disturbances such as logging, grazing, and seed harvesting, causing forest structure to become more heterogeneous. This can critically affect natural regeneration and stand development. It also challenges forest management and yield estimations, involving tree height predictions. The data allow to assess the impact of anthropogenic disturbances on forest structure and to identify optimal tree height models and calibration designs. Based on the data provided, a general workflow for this purpose was developed and published on GitHub as R software (Zhou & Zwanzig 2022).</p> <p><em><strong>Location: </strong></em>Mixed <em>Araucaria-Nothofagus</em> forests of the Andes Cordillera in the Araucaria Region in south-central Chile. Latitude, longitude and altitude of the plots is provided in the data table.</p> <p><em><strong>Taxon:</strong></em> Monkey Puzzle tree (<em>Araucaria araucana</em> (Molina) K.Koch), Lenga Beech (<em>Nothofagus pumilio</em> (Poepp. & Endl.) Krasser), Coigue (<em>Nothofagus dombeyi</em> (Mirb.) Oerst.)</p> <p><em><strong>Methods:</strong></em> A total of twelve stands were studied at four different sites and classified into four different intensities of anthropogenic disturbance depending on the intensity of the combined effects of logging, grazing and seed harvesting. In 25 to 36 plots per stand, horizontal point sampling measurements of stem diameter as well as of height of selected trees were carried out using a basal area factor of 4 m² per hectare. Diameter at breast height (DBH, in cm) was measured for all selected trees and total tree height (HT, in m) was measured for one-third of them using a Haga device.</p> <p>For ten of the plots, in which no trees were found by horizontal point sampling, 'NA' is entered for species and no values are given for DBH and HT in the data table.</p> <p><em><strong>Funding:</strong></em> The field data collection was funded through the project 016/2019 “Indicadores fenológicos y estructurales de alteración de hábitat en bosques de <em>Araucaria</em>”, being part of the Fondo de Investigación del Bosque Nativo (FIBN) of the Corporación Nacional Forestal (CONAF) and the Ministry of Agriculture of Chile.</p> <p><em><strong>Contributions:</strong></em> JH, PC and AP conceived the field study and acquired the funds; EK, JH, PC and AP performed the empirical observations; XZ, EK and MZ reviewed and processed the data collection for publication.</p>
Data from: Mowing effects on woody stem density and woody and herbaceous vegetation heights along Mississippi highway right-of-ways
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A new algorithm for reconstructing tree height growth with stem analysis data
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Tree regeneration after fire: Aspen removal experiment, Aspen stem numbers, biomass and canopy height
This research was intended to address the general question of whether asexual stem regeneration of trembling aspen (Populus tremuloides Michx.) reduces rates of establishment and growth of potential invading conifer species during the initial years following fire. Interactions between aspen and conifers were studied under natural conditions in a burned aspen stand with a high potential for aspen re-sprouting. The study contributes to our understanding of whether competitive interactions between tree seedlings are likely to help maintain deciduous stands across disturbance cycles by reducing the potential for successful conifer establishment. Includes measurements of aspen stem numbers, biomass and canopy height in clipped and control plots, for samples in 2000 (start of the experiment) and 2002 (experiment harvest on August 16, 2002).
Stem_height_area1
<p>Stem height was derived from remote sensing data (Pleiades images) and trees height</p>
Stem_height_area2
<p>Stem height was derived from remote sensing data (Pleiades images) and trees height</p>
Data from: Outer bark thickness decreases more with height on stems of fire-resistant than fire-sensitive Floridian oaks (Quercus spp.; Fagaceae)
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Dynamics of heights and stem diameters in short-rotation woody crops (SRWCs) in NE of Romania
<p>Data are collected from short-rotation woody crops (SRWCs) installed in NE Romania (close to the border with Ukraine), located in the hilly area (Suceava county), at an average altitude of 350 m. SRWCs were installed in 2014–2016 with two hybrid poplar clones: AF8 (P. x generosa 103-86 x P. trichocarpa PEE) and Pannonia (P. x euramericana), at a planting spacing of 3 x 2 m (with 1667 trees/ha), from rods (2 m long cuttings) as planting material. The rods were planted in the soil using a planting machine at a depth of 0.6 m. During each growing season, regular maintenance work was carried out.</p> <p>The inventory was carried out after 5, 6, and 7 growing seasons, and the choice of sample areas (3 x 10 trees for each variant) was made to avoid marginal influences. Heights (m) was measured on trees at ground level using a router (ensuring 1 cm accuracy) for each year/season of growth in the trunk node (insertion site of lower-order trunk segments). Diameters (cm) were measured on the trunk at one metre intervals (from the base to the top, where it was a whole multipu -1 m) using forest calipers, ensuring an accuracy of 0.1 cm.</p> <p>The height data can be used to generate the evolution of height growth for each crop variant. Results can be compared between growing seasons for total values. From base to top, diameter can generate the shape of the tree stem, comparing the two clones analysed in relation to planting density.</p>
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