scholarly journals Spatial Distribution, Regeneration, Growth and Thicket Formation of Thornless Mimosa tenuiflora in a Caatinga Site of Northeast Brazil

2020 ◽  
pp. 137-149
Author(s):  
Maria Beatriz Ferreira ◽  
Olaf Andreas Bakke ◽  
Geovana Gomes de Sousa ◽  
Ivonete Alves Bakke ◽  
Sebastiana Renata Vilela Azevedo ◽  
...  
Keyword(s):  
Random Distribution ◽  
Tree Cover ◽  
Pure Stand ◽  
Diameter Class ◽  
Basal Diameter ◽  
Breast Height ◽  
Clustering Pattern ◽  
Adult Plants ◽  
Juvenile Plants ◽  
Mimosa Tenuiflora

Aims: Percentage of native thorny and thornless Mimosa tenuiflora (Willd.) Poiret trees, and their growth, height and/or diameter class distribution and clustering pattern were determined in a pure stand of this species. Study Design: A survey of the adult and juvenile plants was carried out in a 50 m x 50 m site after 10 years of tree cover regeneration. Place and Duration of Study: The study site was located at Fazenda Nupearido, Patos-PB, Brazil and data collection occurred in September 2017. Methodology: Adult plants with trunk circumference at breast height (1.3 m from the soil) > 6 cm (CBH > 6 cm) were measured for height and CBH, and located within the study area. Juvenile plants (i.e.: CBH ≤ 6 cm) were divided into 4 height classes. The position of only the thornless individuals within the study area was determined. Results: Among the 170 adult plants documented in the area, 95.3% and 4.7% were thorny and thornless, respectively. Height and diameter at breast height averaged higher for thornless than for thorny adult plants (4.13 m and 9.28 cm vs. 3.61 m and 5.90 cm). In contrast, thornless juvenile plants averaged lower for height and basal diameter than the thorny ones. The number of juvenile M. tenuiflora totaled 897 plants, including 58 thornless ones, but percentage of thornless juveniles peaked at 17.6% for 10-to-50 cm high plants. In general, thorny plants showed a clustering pattern of distribution while the thornless plans were randomly distributed. Conclusion: The density, random distribution and growth of the thornless plants suggest the possibility to form thickets of thornless plants in caatinga sites where this tree predominates. Also, these data show that in forested sites with thorny trees that generate thornless mutants, as observed in the Caatinga Biome for M. tenuiflora and other tree species, it is possible to increase the frequency and abundance of the naturally regenerating thornless plants, making easier the exploitation of forest resources, an approach that may be applied in other types of vegetation.

scholarly journals Estimation of Genetic Parameters and Wood Yield Selection Index in a Clonal Trial of Korean Pine (Pinus koraiensis) in Northeastern China

2021 ◽  
Vol 13 (8) ◽  
pp. 4167
Author(s):  
David Kombi Kaviriri ◽  
Huan-Zhen Liu ◽  
Xi-Yang Zhao
Keyword(s):  
Selection Index ◽  
Tree Height ◽  
Stem Volume ◽  
Korean Pine ◽  
Branch Number ◽  
Basal Diameter ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Stem Straightness ◽  
Clonal Trial

In order to determine suitable traits for selecting high-wood-yield Korean pine materials, eleven morphological characteristics (tree height, basal diameter, diameter at breast height, diameter at 3 meter height, stem straightness degree, crown breadth, crown height, branch angle, branch number per node, bark thickness, and stem volume) were investigated in a 38-year-old Korean pine clonal trial at Naozhi orchard. A statistical approach combining variance and regression analysis was used to extract appropriate traits for selecting elite clones. Results of variance analysis showed significant difference in variance sources in most of the traits, except for the stem straightness degree, which had a p-value of 0.94. Moderate to high coefficients of variation and clonal repeatability ranged from 10.73% to 35.45% and from 0.06% to 0.78%, respectively. Strong significant correlations on the phenotypic and genotypic levels were observed between the straightness traits and tree volume, but crown breadth was weakly correlated to the volume. Four principal components retaining up to 80% of the total variation were extracted, and stem volume, basal diameter, diameter at breast height, diameter at 3 meter height, tree height, and crown height displayed high correlation to these components (r ranged from 0.76 to 0.98). Based on the Type III sum of squares, tree height, diameter at breast height, and branch number showed significant information to explain the clonal variability based on stem volume. Using the extracted characteristics as the selection index, six clones (PK105, PK59, PK104, PK36, PK28, and K101) displayed the highest Qi values, with a selection rate of 5% corresponding to the genetic gain of 42.96% in stem volume. This study provides beneficial information for the selection of multiple traits for genetically improved genotypes of Korean pine.

scholarly journals Assessment of the Regeneration Potential of Red Oaks and Ash on Minor Bottoms of Mississippi

1999 ◽  
Vol 23 (3) ◽  
pp. 133-138 ◽  
Author(s):  
Keith L. Belli ◽  
Christopher P. Hart ◽  
John D. Hodges ◽  
John A. Stanturf
Keyword(s):  
Assessment System ◽  
Diameter Class ◽  
High Quality ◽  
Regeneration Potential ◽  
Breast Height ◽  
Growing Seasons ◽  
Red Oaks ◽  
System A ◽  
Advance Regeneration ◽  
Stump Sprouts

Abstract Plots were established to monitor the success of advance regeneration for red oaks and ash on eight high quality sites on minor bottoms in Mississippi. Data were collected pre- and post-harvest, and annually for 3 yr following harvest. Red oak and ash stems were initially categorized by height class, or by diameter class for those stems at least 1 in. in diameter at breast height. Survival and competitive position were monitored to provide estimates of the probability of producing at least one free-to-grow stem 3 growing seasons following stand harvest. Regardless of species, the competitive advantage of larger seedlings and stump sprouts over smaller seedlings (less than 1 ft tall) was clear. Less than 10% of the smaller seedlings were free-to-grow after 3 growing seasons, whereas 26% to 71% of the larger seedlings and stump sprouts were judged free-to-grow after the same amount of time. Results were used to revise an existing regeneration assessment system. A field tally sheet was developed to aid in the application of the revised system. South. J. Appl: For. 23(3): 133-138.

scholarly journals Nesting habitat selection of Mediterranean raptors in managed pinewoods: searching for common patterns to derive conservation recommendations

2013 ◽  
Vol 24 (2) ◽  
pp. 138-151 ◽  
Author(s):  
RAFAEL BARRIENTOS ◽  
BERNARDO ARROYO
Keyword(s):  
Habitat Selection ◽  
Tree Cover ◽  
Nesting Habitat ◽  
Random Factor ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Heterogeneous Habitats ◽  
Large Trees ◽  
Generalised Linear Mixed Model ◽  
Selection Of

SummaryInvestigating habitat selection is a key step in improving the population conservation of forest species in areas managed for different purposes, from timber harvesting to hunting or recreation. Because economic resources allocated to conservation are limited, studies that assess cost-effective strategies are necessary, especially when concerning non-threatened species. We studied nest-site habitat selection of two raptor communities (totalling 245 nests from the five most common species: Short-Toed Eagle Circaetus gallicus, Goshawk Accipiter gentilis, Sparrowhawk A. nisus, Common Buzzard Buteo buteo and Booted Eagle Aquila pennata) in two pinewoods in central Spain separated by 200 km. Using a Generalised Linear Mixed Model for each species and with locality as a random factor, we obtained five models of habitat selection. We highlighted the common nesting patterns in order to facilitate an integrated management of forestry in relation to raptor nesting habitat selection. The most important variable for all species, with the exception of the Sparrowhawk was the nest-tree diameter at breast height, with raptors preferentially selecting nesting trees of large width. Tall trees and a high amount of tree cover around the nesting tree were also important habitat features for several species. Our results suggest that pinewoods should retain unharvested patches with moderate tree coverage (30–70%) containing not only several large trees (diameter at breast height > 40 cm) but also small ones. At the landscape level, open forests and heterogeneous habitats are preferred. These forest patches should be dispersed throughout the landscape.

scholarly journals BIOMASS EQUATIONS FOR CAATINGA SPECIES

Nativa ◽  
2018 ◽  
Vol 6 (5) ◽  
pp. 517
Author(s):  
Mayara Dalla Lana ◽  
Rinaldo Luiz Caraciolo Ferreira ◽  
José Antônio Aleixo da Silva ◽  
Gustavo Pereira Duda ◽  
Carlos Frederico Lins e Silva Brandão ◽  
...  
Keyword(s):  
Aboveground Biomass ◽  
Total Biomass ◽  
Good Precision ◽  
Diameter At Breast Height ◽  
Total Height ◽  
Breast Height ◽  
Biomass Equations ◽  
Statistical Criteria ◽  
Aspidosperma Pyrifolium ◽  
Mimosa Tenuiflora

EQUAÇÕES DE BIOMASSA PARA ESPÉCIES DA CAATINGA O objetivo deste trabalho foi determinar as proporções de fuste, galhos e folhas em relação a biomassa total seca acima do solo e ajustar modelos estatísticos para estimativa da biomassa das principais espécies arbustivo-arbóreas em uma área de Caatinga. O número de indivíduos abatidos e com a biomassa aérea total determinada foi de 15 para Anadenanthera colubrina, Aspidosperma pyrifolium, Cnidoscolus quercifolius, Mimosa ophthalmocentra, Mimosa tenuiflora, Poincianella bracteosa e, de 30 para Bauhinia cheilantha e Croton heliotropiifolius. Para ajuste dos modelos foram utilizados os dados de biomassa total seca acima do solo coletados como variável dependente e as variáveis independentes foram o diâmetro à altura do peito e a altura total dos indivíduos por espécie. Foram testados oito modelos para cada uma das espécies e para todas as espécies agrupadas. Para a seleção da melhor equação utilizou-se os tradicionais critérios estatísticos. As proporções de biomassa das espécies foram quantificadas, tanto para os seus compartimentos, quanto para o total e apresentaram uma grande variação entre espécies e indivíduos da mesma espécie. Equações de biomassa aérea seca foram ajustadas com boas estatísticas de precisão, podendo ser utilizadas para a sua estimativa de biomassa de maneira confiável em regiões de Caatinga.Palavras-chave: Análise de regressão, diâmetro à altura do peito, altura total. ABSTRACT:The objective of this work was to determine the proportions of stem, branches and leaves in relation to total dry aboveground biomass and adjust statistical models to estimate the biomass of the main species in an area of Caatinga. The number of trees cut and with the determined total aboveground biomass was 15 for Anadenanthera colubrina, Aspidosperma pyrifolium, Cnidoscolus quercifolius, Mimosa ophthalmocentra, Mimosa tenuiflora, and Poincianella bracteosa, and 30 for Bauhinia cheilantha and Croton heliotropiifolius. The data of total dry aboveground biomass were used as dependent variables and the diameter at breast height and total height of individuals per species were used as the independent variables for adjusting the models. Eight models were tested for each species and for all grouped species. Traditional statistical criteria was used for selecting the best equation. The proportions of the species were quantified for both their biomass compartments and for the total biomass, showing great variation between species and individuals of the same species. Dry aboveground biomass equations were developed with good precision statistics and can therefore be used for estimating biomass in Caatinga regions.Keywords: Regression analysis, diameter at breast height, total height.

Estimation of coarse root biomass and nutrient content for sugar maple, jack pine, and black spruce using stem diameter at breast height

2008 ◽  
Vol 38 (1) ◽  
pp. 92-100 ◽  
Author(s):  
Rock Ouimet ◽  
Claude Camiré ◽  
Marcel Brazeau ◽  
Jean-David Moore
Keyword(s):  
Tree Species ◽  
Root Biomass ◽  
Sugar Maple ◽  
Black Spruce ◽  
Nutrient Content ◽  
Root Diameter ◽  
Stem Diameter ◽  
Diameter Class ◽  
Coarse Root ◽  
Breast Height

Estimates of belowground biomass and mineralomass are fundamental to understanding carbon and element cycling in forest ecosystems. At two sites, we measured coarse root (diameter ≥2 mm) biomass by diameter class and their mineralomass for sugar maple ( Acer saccharum Marsh.), black spruce ( Picea mariana (Mill.) BSP), and jack pine ( Pinus banksiana Lamb.) trees to relate them to stem diameter at breast height (DBH). All regressions describing coarse root biomass and nutrient content as a function of stem DBH were highly significant (r2 ≥ 0.89, P < 0.001). Root mineral element (N, P, K, Ca, Mg, and S) concentrations varied with tree species and root diameter class. Sugar maple roots had higher N, P, and S concentrations than the other two tree species. Black spruce had higher root Ca concentrations. Element concentrations increased consistently with the reduction of root diameter for the three studied species. We also found that the horizontal root extent of sugar maple was related to tree DBH. In conjunction with other studies, the relationship suggests that this tree species could tolerate a 10%–20% root loss but not losses ≥28%–34%; otherwise, sugar maple health and vigour would be compromised in the short term.

scholarly journals Crown Area as a Parameter for Biomass Estimation of Croton sonderianus Müll. Arg.

2019 ◽  
Vol 26 (4) ◽  
Author(s):  
Jeferson Luiz Dallabona Dombroski ◽  
José Rivanildo de Souza Pinto
Keyword(s):  
Plant Height ◽  
Plant Biomass ◽  
Remote Sensing Data ◽  
Biomass Estimation ◽  
Tree Biomass ◽  
Basal Diameter ◽  
Crown Area ◽  
Breast Height ◽  
Multiple Stems ◽  
Non Destructive

ABSTRACT Current tree biomass estimation techniques generally use remote sensing data and allometric models for validation, which relate non-destructive parameters to plant biomass, usually employing diameter at the plant base or breast height and plant height. In the Caatinga Biome, many plants present multiple stems, thus making it difficult to measure the plant diameter, and lost branches, which are difficult to correct for. Hence, there is a need for suitable models for Caatinga plants, as well as studies on the possibility of using other parameters. For this study, plant and branch basal diameter, plant height, and crown area of Croton sonderianus plants were measured, and plants were also collected and weighed. Several classic models and their variations were tested. The best models were variations of Naslund (R2 = 0.92; rmse = 1,221) and Schumacher & Hall (R2 = 0.92; rmse = 1,217). Plant height and crown area enables a better biomass estimation than using plant or branch basal diameter.

A simplified tree bait for the mountain pine beetle

1993 ◽  
Vol 23 (6) ◽  
pp. 1108-1113 ◽  
Author(s):  
J.H. Borden ◽  
L.J. Chong ◽  
B.S. Lindgren ◽  
E.J. Begin ◽  
T.M. Ebata ◽  
...  
Keyword(s):  
Release Rate ◽  
Mountain Pine Beetle ◽  
Diameter Class ◽  
Individual Tree ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Mountain Pine ◽  
Pine Beetle ◽  
Antiaggregation Pheromone ◽  
And Control

Seven, split-block experiments throughout British Columbia in 1989 tested the efficacy of binary tree baits containing the pheromones trans-verbenol and exo-brevicomin or ternary baits with the addition of the host tree kairomone myrcene for containing and concentrating infestations of the mountain pine beetle, Dendroctonusponderosae Hopkins, in stands of lodgepole pine, Pinuscontorta var. latifolia Engelm. Attack densities on baited trees, attack frequencies of baited trees and trees within 10 m of the baited trees, and the ratios of newly attacked, green, trees to previously attacked, red, trees were generally statistically equal between sub-blocks containing binary or ternary baits. Where statistically significant differences occurred for one or more of the above criteria in one experiment, they were generally offset by statistically significant differences in the opposite direction in another experiment. Two individual-tree experiments in 1990 that supported the equality of binary and ternary baits indicated that raising the release rate of trans-verbenol in binary baits tended to reduce their efficacy (possibly because of contamination with the antiaggregation pheromone verbenone) and showed that increasing the release rate of exo-brevicomin tended to counteract this effect. When attack frequencies were subdivided by diameter class of available trees attacked, all baits were effective in inducing attack on available trees <30.0 cm diameter at breast height (1.3 m), but attack on baited and control trees ≥30 cm diameter at breast height was equal. Provided that the trans-verbenol in binary baits does not contain or autoxidize to verbenone, myrcene can be deleted from operational tree baits.

scholarly journals Population structure of Alnus jorullensis, a species used as firewood by five rural communities in a natural protected area of Mexico

2020 ◽  
Vol 98 (2) ◽  
pp. 238-247
Author(s):  
Carla Leticia López-Sánchez ◽  
Beatriz Bolívar-Cimé ◽  
Armando Aparicio-Rentería ◽  
Héctor Viveros-Viveros
Keyword(s):  
Population Structure ◽  
Rural Communities ◽  
Population Density ◽  
Protected Area ◽  
National Park ◽  
Permanent Plots ◽  
Pioneer Species ◽  
Basal Diameter ◽  
Breast Height ◽  
Standing Trees

Background: Ilite (Alnus jorullensis) is a very important pioneer species for the regeneration of temperate forests but also the source of fuel for the inhabitants of the Cofre de Perote National Park in Veracruz, Mexico. Questions: How much ilite is consumed by families in the Cofre de Perote National Park? What type of population structure is exhibited by Alnus jorullensis? Are there differences in population structure of this species between years? What is the diameter of the individuals extracted for firewood? Study site and dates: The population structure of ilite was evaluated during April 2016 and April 2017 in five localities of the Cofre de Perote National Park. Methods: Eighty families in these localities were interviewed about the use of firewood. Eighteen permanent plots of 20 × 50 m were established in order to record total height and diameter at breast height (130 cm) of standing trees of A. jorullensis and the basal diameter of its stumps. Results: Families in the study area indicated that they use in average 2 loads of ilite as firewood per week and extract adult individuals. Population density of ilite decreased from 2016 to 2017, in both years juvenile individuals were predominant, with a low presence of seedlings. Population structure did not differ between years. The basal diameters of stumps measured between 6 and 214 cm. Conclusions: Extraction of A. jorullensis did not change its population structure between years, however local inhabitants perceive that this activity and clandestine logging are affecting their availability.

scholarly journals Structure of Plants across Habitat Types in Amurum Forest Reserve, Plateau State Nigeria

2021 ◽  
Vol 25 (5) ◽  
pp. 847-850
Author(s):  
N. Janfa ◽  
M.J. Francis ◽  
C. Kambai ◽  
M.S. Chomini ◽  
S.A. Popoola ◽  
...  
Keyword(s):  
Habitat Type ◽  
Height Distribution ◽  
Gallery Forest ◽  
Diameter Class ◽  
Habitat Types ◽  
Forest Reserve ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Rocky Outcrop ◽  
Plateau State

The Amurum Forest Reserve is one of the nature reserves in Plateau State North central Nigeria. Strict Nature reserve is prominent among the methods for in situ conservation of biodiversity in Nigeria and also the world at large. A study was conducted in the Forest across three habitat types in order to measure tree height and diameter at breast height (dbh) of trees. 50m x 50m plots were marked across the habitat types by simple random sampling technique. Trees and shrubs were identified to species level. Measurement were limited to all woody plants with diameter at breast height (dbh) of ≥ 10cm. Data collected was analyzed in excel. A total of 397 woody species were identified during the study period. 87.7 of the plants were shrubs while 12.3% were trees. The gallery forest had the highest diameter class(30-35cm) followed by the savanna(25-30cm) and lastly the rocky outcrop with the diameter class of 20-25cm.The rocky outcrop had the highest number of trees with the lowest dbh (10-15cm) while the gallery forest had more trees in the highest diameter class (30-35) (Figure 2). The highest mean height distribution in the Gallery forest shows that the plant communities in this habitat type has grown over the years without disturbance since the place is a protected site. Therefore, other surrounding bushes should be protected in order to preserve species from local extinction.

Sign in / Sign up

Export Citation Format

Share Document