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8 results for “stem diameter”
Stem diameter of trees and shrubs in thinleaf alder sites along the Tanana River floodplains and severity of stem canker infection of alder in 2006.
This dataset includes the stem diameter of each woody plant >2m tall, by species (or genus), found in each of the thinleaf alder sites we established in the Tanana River floodplains in 2006, as well as an assessment of the severity of canker infection in each thinleaf alder stem. Species (or genus), diameter at breast height (dbh), and severity of canker infection are the variables included here. This dataset can be used in conjunction with a dataset of alder size/age relationships (DN_alder_stand_structure2.xls) to estimate the age structure of alder stands.
Text-fig. 13. Macrophotographs of the fossil stems from Mhengere. a: large (90 cm diameter) palm tree trunk in situ; b: external view of the outer roots at the base of the trunk; average diameter of single root is 7 mm; c, d: cross-sections of a fragment of trunk showing the random distribution of equal-sized fibre vascular bundles throughout the trunk, the so-called Coccos-type. in Stratigraphy, Chronology And Palaeontology Of The Tertiary Rocks Of The Cheringoma Plateau, Mozambique
Text-fig. 13. Macrophotographs of the fossil stems from Mhengere. a: large (90 cm diameter) palm tree trunk in situ; b: external view of the outer roots at the base of the trunk; average diameter of single root is 7 mm; c, d: cross-sections of a fragment of trunk showing the random distribution of equal-sized fibre vascular bundles throughout the trunk, the so-called Coccos-type.
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>
Multiple abiotic and biotic drivers of long-term wood decomposition within and among species in semiarid inland dunes: a dual role for stem diameter
<p>This is wood decomposition data conducted in an semiarid inland dune including mass loss, initial wood traits and k values of combinations between five diameter classes and four shrub species under different treatments including UV and litter position. We found that after 34 months of in situ incubation, the mass loss of buried woody litters was three times faster than those of suspended and surface woody litters (53.5 ± 2.7 %, 17.0 ± 1.0 % and 14.4± 1.2 %, respectively). In surface and suspended positions, litter decomposition rates were almost equally low and most mass loss was during the first two years, when bark was still attached and UV radiation had no significant effect on woody litter mass loss.</p> <p> </p> <p> </p>
Data from: Maximum stem diameter predicts liana population demography
<p>Determining population demographic rates is fundamental to understanding differences in species life-history strategies and their capacity to coexist. Calculating demographic rates, however, is challenging and requires long-term, large-scale censuses. Body size may serve as a simple predictor of demographic rate; can it act as a proxy for demographic rate when those data are unavailable? We tested the hypothesis that maximum body size predicts species' demographic rate using repeated censuses of the 77 most common liana species on the Barro Colorado Island, Panama (BCI) 50-ha plot. We found that maximum stem diameter does predict species' population turnover and demography. We also found that lianas on BCI can grow to the enormous diameter of 635 mm, indicating that they can store large amounts of carbon and compete intensely with tropical canopy trees. This study is the first to show that maximum stem diameter can predict plant species' demographic rates and that lianas can attain extremely large diameters. Understanding liana demography is particularly timely because lianas are increasing rapidly in many tropical forests, yet their species-level population dynamics remain chronically understudied. Determining per-species maximum liana diameters in additional forests will enable systematic comparative analyses of liana demography and potential influence across forest types.</p>
Multiple abiotic and biotic drivers of long-term wood decomposition within and among species in semiarid inland dunes: a dual role for stem diameter
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Data from: Maximum stem diameter predicts liana population demography
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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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