scholarly journals Gum Arabic Production and Population Status of Senegalia senegal (L.) Britton in Dryland Forests in South Omo Zone, Ethiopia

2021 ◽  
Vol 13 (21) ◽  
pp. 11671
Author(s):  
Gizachew Zeleke ◽  
Tatek Dejene ◽  
Wubalem Tadesse ◽  
Pablo Martín-Pinto
Keyword(s):  
Tree Species ◽  
Linear Models ◽  
Gum Arabic ◽  
Yield Potential ◽  
Population Status ◽  
Tree Diameter ◽  
Valuable Product ◽  
Senegalia Senegal ◽  
South Omo ◽  
Natural Stands

Senegalia senegal (L.) Britton is a multi-purpose dryland tree species that produces gum arabic, a commercially valuable product. However, this resource is underused in Ethiopian dryland areas. The aim of this study was to evaluate the population status and potential gum yield of S. senegal growing in natural stands in South Omo Zone, Ethiopia. Forty-five sample plots, each measuring 20 × 20 m, were established at 500 m intervals along transects, with 1 m2 subplots located within the main plots to determine regeneration. S. senegal trees with a diameter at breast height of between 2 and 12 cm were most prevalent. Forty-two tree species were associated with S. senegal, of which 16 were gum- and resin-producing species. S. senegal was positively associated with Vachellia tortilis, Senegalia mellifera, Vachellia nilotica, Commiphora edulis, and Dobera glabra. Senegalia senegal comprised approximately 35% of regenerating trees. The maximum gum arabic yield obtained was 3948 g tree−1. Linear models of dendrometric variables indicated that gum arabic yield is better predicted by tree diameter than by height. Despite the limitations of this pioneer survey, the population status and yield potential suggest that gum arabic could be sustainably produced and commercialized in natural stands of S. senegal in the studied dryland areas, providing local communities with supplementary seasonal incomes.

Guidelines for choosing volume equations in the presence of measurement error in height

2000 ◽  
Vol 30 (2) ◽  
pp. 306-310 ◽  
Author(s):  
M S Williams ◽  
H T Schreuder
Keyword(s):  
Measurement Error ◽  
Tree Species ◽  
Measurement Errors ◽  
Tree Diameter ◽  
Total Height ◽  
Volume Equations

Assuming volume equations with multiplicative errors, we derive simple conditions for determining when measurement error in total height is large enough that only using tree diameter, rather than both diameter and height, is more reliable for predicting tree volumes. Based on data for different tree species of excurrent form, we conclude that measurement errors up to ±40% of the true height can be tolerated before inclusion of estimated height in volume prediction is no longer warranted.

Estimating Breast Height Diameters from Stump Measurements in British Columbia

1982 ◽  
Vol 58 (3) ◽  
pp. 143-145 ◽  
Author(s):  
Julien P. Demaerschalk ◽  
Stephen A. Y. Omule
Keyword(s):  
British Columbia ◽  
Prediction Model ◽  
Tree Species ◽  
Prediction System ◽  
Tree Diameter ◽  
Local Volume ◽  
Breast Height ◽  
Central Canada ◽  
Volume Equation ◽  
Stump Diameter

A means of estimating tree diameter at breast height from stump measurements has many applications. In this paper, metric equations are derived for estimating diameters at breast height from measured stump heights for all commercial tree species in British Columbia by age class and biogeoclimatic zones. The model found best was the same one as used by Alemdag and Honer (1977) for eleven tree species from eastern and central Canada. This prediction system can be incorporated into any local volume equation to derive a tree volume prediction model based on stump diameter and stump height.

Regeneration ecology and population status of a critically endangered and endemic tree species (Ilex khasiana Purk.) in north-eastern India

2009 ◽  
Vol 20 (3) ◽  
pp. 223-228 ◽  
Author(s):  
Upadhaya Krishna ◽  
Barik Saroj Kanta ◽  
Adhikari Dibyendu ◽  
Baishya Ratul ◽  
Lakadong Nigyal John
Keyword(s):  
Tree Species ◽  
Critically Endangered ◽  
Eastern India ◽  
Population Status ◽  
North Eastern ◽  
Regeneration Ecology ◽  
North Eastern India

Biomass of jack pine and mixed hardwood stands in northeastern New Brunswick

1976 ◽  
Vol 6 (4) ◽  
pp. 441-447 ◽  
Author(s):  
David A. MacLean ◽  
Ross W. Wein
Keyword(s):  
New Brunswick ◽  
Tree Species ◽  
Biomass Accumulation ◽  
Jack Pine ◽  
Tree Crown ◽  
Tree Diameter ◽  
Stem Biomass ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Fire Origin

Biomass accumulation in 12 jack pine and 11 mixed hardwood stands of fire origin ranging in age from 7 to 57 years is presented. Logarithmic equations relating aboveground tree, crown, and stem biomass to tree diameter at breast height are given for eight tree species.

scholarly journals Nothing else matters? Tree characteristics have more effects than biogeoclimatic context on microhabitat diversity and occurrence: a nationwide analysis

2018 ◽  
Author(s):  
Yoan Paillet ◽  
Nicolas Debaive ◽  
Frédéric Archaux ◽  
Eugénie Cateau ◽  
Olivier Gilg ◽  
...  
Keyword(s):  
Tree Species ◽  
Large Scale ◽  
Wood Decay ◽  
Life Cycles ◽  
Structural Elements ◽  
Biodiversity Indicators ◽  
Forest Reserves ◽  
Tree Diameter ◽  
Dead Trees ◽  
Large Living

AbstractManaging forests to preserve biodiversity requires a good knowledge not only of the factors driving its dynamics but also of the structural elements that actually support biodiversity. Tree-related microhabitats (cavities, cracks, conks of fungi) are tree-borne features that are reputed to support specific biodiversity for at least a part of species’ life cycles. While several studies have analysed the drivers of microhabitats number and occurrence at the tree scale, they remain limited to a few tree species located in relatively narrow biogeographical ranges. We used a nationwide database of forest reserves where microhabitats were inventoried on more than 22,000 trees. We analysed the effect of tree diameter and living status (alive or dead) on microhabitat number and occurrence per tree, taking into account biogeoclimatic variables and tree genus.We confirmed that larger trees and dead trees bore more microhabitats than their smaller or living counterparts did; we extended these results to a wider range of tree genera and ecological conditions. Contrary to expectations, the total number of microhabitat types per tree barely varied with tree genus – though we did find slightly higher accumulation levels for broadleaves than for conifers – nor did it vary with elevation or soil pH. We observed the same results for the occurrence of individual microhabitat types. However, accumulation levels with diameter and occurrence on dead trees were higher for microhabitats linked with wood decay processes (e.g. dead branches or woodpecker feeding holes) than for other, epixylic, microhabitats such as epiphytes (ivy, mosses and lichens).Promoting large living and dead trees of several tree species may be an interesting, and nearly universal, way to favour microhabitats and enhance the substrates needed to support specific biodiversity. In addition, a better understanding of microhabitat drivers and dynamics at the tree scale may help to better define their role as biodiversity indicators for large-scale monitoring.

scholarly journals HeightߝDiameter Equations for 12 Upland Species in the Missouri Ozark Highlands

2007 ◽  
Vol 24 (2) ◽  
pp. 149-152 ◽  
Author(s):  
James R. Lootens ◽  
David R. Larsen ◽  
Stephen R. Shifley
Keyword(s):  
Tree Species ◽  
Tree Height ◽  
Tree Diameter ◽  
Ozark Highlands ◽  
The Mean ◽  
Predicted Values ◽  
Total Tree

Abstract We calibrated a model predicting total tree height as a function of tree diameter for nine tree species common to the Missouri Ozarks. Model coefficients were derived from nearly 10,000 observed trees. The calibrated model did a good job predicting the mean heightߝdiameter trend for each species (pseudo-R2 values ranged from 0.56 to 0.88), but for a given tree diameter observed tree heights were highly variable. We also present a technique for incorporating the observed variation in tree heights in the predicted values.

Studi Karakteristik Sarang Orangutan (Pongo pygmaeus morio) di Resort Sangatta dan Resort Sangkima Taman Nasional Kutai

SCISCITATIO ◽  
2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Marcelina Tikurara Londong Allo ◽  
Kisworo ◽  
Suhendra
Keyword(s):  
Tree Species ◽  
National Park ◽  
Tree Height ◽  
Pongo Pygmaeus ◽  
Average Height ◽  
Tree Diameter ◽  
Transect Line ◽  
Nest Height ◽  
Nest Type

Orangutan (Pongo pygmaeus morio) merupakan satwa langka yang harus dikonservasi melalui pelestarian Taman Nasional Kutai (TNK). Studi karakteristik sarang orangutan merupakan bagian dari upaya pelestarian. Metode yang digunakan dalam penelitian ini adalah menggunakan jalur transek dengan menghitung sarang orangutan serta mencatat karakteristik sarang orangutan yang meliputi kelas sarang, posisi sarang, tinggi sarang, tinggi pohon, diameter pohon dan jenis pohon sarang. Pada lokasi penelitian ditemukan sebanyak 173 sarang orangutan yang terdiri dari 84 sarang di resort Sangatta dan 89 sarang di resort Sangkima. Jenis sarang didominasi oleh kelas sarang C dan D dengan posisi sarang sebagian besar terdapat pada ujung dahan (UD) di resort Sangatta, posisi sarang terbanyak ada pada ujung dahan (UD) dan pucuk pohon (PP) di resort Sangkima. Rata-rata tinggi sarang orangutan adalah 12,2 - 40,2 m, diameter pohon 17,4 - 110 cm, dan tinggi pohon 12,2 - 40,2 m di resort Sangatta. Pada resort Sangkima rata-rata tinggi sarang orangutan adalah 10,2 - 24,2 m dengan diameter pohon 20 - 109,4 cm dan rata-rata tinggi pohon 14-28,6 m. Karakteristik sarang orangutan menjadi indikator kondisi habitat orangutan yang ada di TNK. Orangutan (Pongo pygmaeus morio) is a rare animal that must be conserved through the preservation of the Kutai National Park (KNP). Study of orangutan nest characteristics is part of conservation efforts. The method used in this study is to use a transect line by counting orangutan nests and noting orangutan nest characteristics which include nest class, nest position, nest height, tree height, tree diameter and nest tree species. At the study site, 173 orangutan nests were found, consisting of 84 nests at Sangatta resort and 89 nests at Sangkima resort. The nest type is dominated by the nest classes C and D with the nest position mostly found at the tip of the branch (UD) at Sangatta resort, the position of most nests is at the tip of the branch (UD) and tree tops (PP) at the Sangkima resort. The average height of orangutan nests is 12.2 - 40.2 m, tree diameter 17.4 - 110 cm, and tree height 12.2 - 40.2 m at Sangatta resort. At Sangkima resort, the average height of orangutan nests is 10.2 - 24.2 m with a tree diameter of 20 - 109.4 cm and an average tree height of 14-28.6 m. The characteristics of orangutan nests are an indicator of the condition of orangutan habitat in KNP.

scholarly journals Tree size comparison of some important street trees growing at different sites of Karachi City, Pakistan

2016 ◽  
Vol 20 (2) ◽  
pp. 453-461
Author(s):  
Muhammad Zafar Iqbal ◽  
Amber Khan ◽  
Muhammad Shafiq ◽  
Mohammad Athar ◽  
Zia-Urrehman Farooqi ◽  
...  
Keyword(s):  
Urban Environment ◽  
Tree Species ◽  
Tree Size ◽  
University Campus ◽  
Tree Diameter ◽  
Healthy Environment ◽  
Particulate Air Pollution ◽  
Breast Height ◽  
Ficus Benghalensis ◽  
Wide Range

The importance of trees in urban environment is now widely recognized as they cleanse the particulate air pollution and help to make cities and towns more agreeable places to dwell upon. A detailed survey was conducted to study the size of Alstonia scholaris, Azadirachta indica, Bombax ceiba, Cassia fistula, Eucalyptus sp., Ficus benghalensis, Ficus religiosa and Guaiacum officinale trees in the urban environment of Karachi, Pakistan. Results showed a wide range of variation in tree diameter breast height (17.12-65.50 cm) at M. A. Jinnah Road, University Road (near Hassan Square), North Nazimabad and Karachi University Campus, respectively. A. indica, Eucalyptus sp., and F. benghalensis showed less dbh (tree diameter breast height) at M. A. Jinnah Road as compared to University Road (near Hassan Square), North Nazimabad and Karachi University Campus, respectively. G. officinale growing at University Road (near Hassan Square) showed  ess tree dbh as compared to M. A. Jinnah Road and Karachi University campus. Similarly, the tree size of B. ceiba and A. scholaris was recorded less at Nazimabad as compared to M. A. Jinnah Road, University Road (near Hassan Square) and Karachi University Campus, respectively. C. fistula growing at North Nazimabad site showed low tree dbh as compared to University Road (near Hassan Square) site. A. scholaris growing at Karachi University Campus site showed highest dbh value as compared to all studied sites. The tree size of G. officinale was recorded highest at M. A. Jinnah Road as compared to North Nazimabad, University Road (near Hassan Square) and Karachi University Campus, respectively. Whereas, Eucalyptus sp. and F. benghalensis recorded highest dbh at North Nazimabad site as compared to M. A. Jinnah Road, University Road (near Hassan Square) and Karachi University Campus, respectively. More research is needed on these trees for healthy environment of city. The present study recommends for the complete documentation of tree species growing in city. Such information will be useful to identify characteristics that can be used to select tree species that are better suited for planting on other areas of the city. These findings can be helpful for arboriculturists, environmental scientists and town planners when working on plantation in the selected area.Keywords: Circumference, diameter at breast height, size, roadside tree, urban environment, Pakistan

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