scholarly journals Height Allometry of Pinus nigra Arn. in Troodos National Forest Park, Cyprus

2021 ◽  
Vol 13 (11) ◽  
pp. 5998
Author(s):  
Dimitrios I. Raptis ◽  
Vassiliki Kazana ◽  
Nikolaos Onisiforou ◽  
Christos Stamatiou ◽  
Angelos Kazaklis
Keyword(s):  
Forest Management ◽  
Mathematical Formulation ◽  
Tree Height ◽  
Large Degree ◽  
Pinus Nigra ◽  
Mixed Effects ◽  
Parameter Estimates ◽  
Black Pine ◽  
Biological Processes ◽  
Total Height

Total height is one of the basic morphometric tree variables included in all forest management inventories, because it is connected with several forest processes and functions related to the estimation of the woody tree volume and sustainable forest yield. The current research, based on a total sample of 1059 measured Black pine (Pinus nigra Arn.) trees from Cyprus, is an attempt to explore the biological processes related to the tree height allometry of this species and develop a generalized mixed-effects model for tree height prediction. The proposed model, with three additional basic covariates and two random parameters, explained almost 96% of the height variance. The model results showed that although competition and site-connected variables affected the total height, it was the crown base height that explained, to a large degree, the height expression. Through the mixed-effects modeling approach it was possible to explore the complex biological processes related to the tree allometry of Black pine and depict those within a mathematical formulation. The proposed generalized model decreased the error significantly, and therefore it can be used for operational forest management purposes. However, for marginal predictions, use of only the fixed part of the basic model could suffice, since this also provided unbiased parameter estimates.

Mixed-effects height–diameter models for black pine (Pinus nigra Arn.) forest management

Trees ◽  
2021 ◽  
Author(s):  
Dimitrios I. Raptis ◽  
Vassiliki Kazana ◽  
Angelos Kazaklis ◽  
Christos Stamatiou
Keyword(s):  
Forest Management ◽  
Pinus Nigra ◽  
Mixed Effects ◽  
Black Pine

scholarly journals Growth and Survival Variation among Scots Pine (Pinus sylvestrisL.) Provenances

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Süleyman Gülcü ◽  
Nebi Bilir
Keyword(s):  
Pinus Sylvestris ◽  
Scots Pine ◽  
Native Species ◽  
Tree Height ◽  
Pinus Nigra ◽  
Black Pine ◽  
Basal Diameter ◽  
Growth And Survival ◽  
Seed Sources ◽  
Provenance Test

Tree height, basal diameter, and survival were examined in thirteen-year-old provenance test established by 30 seed sources of Scots pine (Pinus sylvestrisL.) at two exotic sites of the species in Southern part of Turkey. Variations within provenance and among provenances and relations among the traits were estimated to compare Scots pine provenance and two other native species. Averages of tree height and basal diameter were 350 cm and 52.7 mm in Aydogmus site and 385 cm and 51.2 mm in Kemer site, respectively. There were large differences within and among provenances for the characters. Sites were similar (p>0.05) for the characters, while there were significant differences (p≤0.05) among provenances within site according to results of variance analysis (ANOVA). Scots pine provenances were higher and had more thickness than that of black pine (Pinus nigraArnold) and Taurus cedar (Cedrus libaniA. Rich.) which were natural species of the region. There were positive and significant (p<0.05) correlations between height and basal diameter in the species. Average survivals were 56% and 35% of the provenances in the sites. They were 71% and 11% in black pine and 53% in Taurus cedar for the sites respectively.

scholarly journals A Crown Width-Diameter Model for Natural Even-Aged Black Pine Forest Management

Forests ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 610 ◽  
Author(s):  
Dimitrios Raptis ◽  
Vassiliki Kazana ◽  
Angelos Kazaklis ◽  
Christos Stamatiou
Keyword(s):  
Forest Management ◽  
Nonlinear Models ◽  
Management Practice ◽  
Basal Area ◽  
Field Measurements ◽  
Pinus Nigra ◽  
Least Square ◽  
Black Pine ◽  
Mixed Effect ◽  
Crown Width

Crown size estimations are of vital importance in forest management practice. This paper presents nonlinear models that were developed for crown width prediction of Black pine (Pinus nigra Arn.) natural, pure, even-aged stands in Olympus Mountain, central Greece. Using a number of measured characteristics at tree and plot level from 66 sample plots as independent variables, an attempt was made to predict crown width accurately, initially based on Least Square Analysis. At the second stage, nonlinear mixed effect modeling was performed in order to increase the fitting ability of the proposed models and to deal with the lack of between observations independence error assumption. Based on the same form, a generalized crown width model was developed by including six main regressors, such as the diameter at breast height, the total height, the canopy base height, the basal area, the relative spacing index and the diameter to quadratic mean diameter ratio, while at the final stage, the same model was expanded to mixed-effect. The proposed models were evaluated against independent crown width sample observations that were also obtained from the study area. The results showed that the two types of mixed-effect models performed equally well and, therefore, we propose those for use in forestry practice. Furthermore, the exact contribution of each inherent variable in crown width allometry was evaluated, thus providing a framework to facilitate field measurements for forest management predictions.

scholarly journals Factors Influencing Epiphytic Lichen Species Distribution in a Managed Mediterranean Pinus nigra Arnold Forest

Diversity ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 59 ◽  
Author(s):  
Ece Sevgi ◽  
Osman Yalçın Yılmaz ◽  
Gülşah Çobanoğlu Özyiğitoğlu ◽  
Hüseyin Barış Tecimen ◽  
Orhan Sevgi
Keyword(s):  
Tree Height ◽  
Pinus Nigra ◽  
Geographic Region ◽  
Lichen Species ◽  
Pine Forests ◽  
Stand Age ◽  
Black Pine ◽  
Frequency Data ◽  
Epiphytic Lichen ◽  
Lichen Diversity

Lichens have important ecological functions in black pine forests, such as nitrogen fixation and nutrient cycling. Understanding lichen diversity could provide a better understanding of black pine ecosystems. The aim of this study was to identify the factors affecting the composition of lichen communities and their specific diversity in Mediterranean black pine forests. Research was conducted in 48 sampling plots. For the analysis, presence–absence and frequency data of lichen species were used. For stand level analysis, four community composition tables were created. We used bioclimate, topography, stand, and parent rock as variables. A total of 33 epiphytic lichen species were identified in the black pine forests from 282 sampled trees. Indicator lichen species were determined according to geographic region and stand age classes. Hypocenomyce scalaris was found to be an indicator species for old forests. Frequency data were more useful for revealing lichen species composition than presence–absence data. Of the topographic variables, elevation was the most prominent and had the highest explanation ratio for the composition of lichen species with a coefficient of correlation (R2) value of 0.49. Significantly positive (p < 0.001) relationships were found between epiphytic lichen richness and tree crown height, tree height, and bark pH. Our results revealed that to retain the trees in the stands rich in lichen species diversity is recommended in the managed forests.

Estimation de la hauteur des peuplements forestiers par diffusiomètre radar

2000 ◽  
Vol 30 (12) ◽  
pp. 1983-1991 ◽  
Author(s):  
J M Martinez ◽  
A Beaudoin ◽  
P Durand ◽  
T Le Toan ◽  
N Stach
Keyword(s):  
Forest Management ◽  
Basal Area ◽  
Tree Height ◽  
Pinus Nigra ◽  
Site Index ◽  
Sensor Data ◽  
Stem Volume ◽  
Backscatter Coefficient ◽  
Scatter Coefficient ◽  
Local Site

This paper presents the results of an analysis of radar airborne scatterometer data obtained over an Austrian black pine (Pinus nigra Arnold ssp. nigricans Host.) forest in Lozère, France. This system provides vertical sounding inside canopy from which can be derived tree height estimations. The objective of this paper is to analyse the validity of these measurements and, then, to study the interest of this kind of sensors for better forest management. The mean and top height estimations give very good results with a relative error of about 6%. The radar measures the back scatter coefficient of the vegetation from which can be estimated other parameters such as stem volume or basal area. The radar backscatter coefficient is found to be sensitive to the biomass in a low to intermediate range of values (0-200 m3/ha), particularly when the canopy backscattering is separated from the ground echo. The estimation of stem volume using a regression with both tree height estimations and backscatter measurements gives satisfying results. Finally, we discuss the interest of this kind of sensor data for an improved and detailed forest management giving an example of application on the evaluation of the variability of the local site index within a stand.

scholarly journals A Mixed-Effects Model for the dbh–Height Relationship of Shortleaf Pine (Pinus echinata Mill.)

2008 ◽  
Vol 32 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Chakra B. Budhathoki ◽  
Thomas B. Lynch ◽  
James M. Guldin
Keyword(s):  
Tree Height ◽  
Ordinary Least Squares ◽  
Mixed Effects ◽  
Mixed Effects Model ◽  
Tree Level ◽  
Permanent Plots ◽  
Pinus Echinata ◽  
Shortleaf Pine ◽  
Individual Tree ◽  
Total Height

Abstract Individual tree measurements were available from over 200 permanent plots established during 1985–1987 and later remeasured in naturally regenerated even-aged stands of shortleaf pine (Pinus echinata Mill.) in western Arkansas and eastern Oklahoma. The objective of this study was to model shortleaf pine growth in natural stands for the region. As a major component of the shortleaf modeling effort, an individual tree-level dbh–total height model was developed in which plot-specific random parameters were fitted using maximum-likelihood methods. The model predicts tree height on the basis of dbh and dominant stand height (which could be obtained from a site-index model). The mixed-effects model approach was found to predict the total height better than the similar models developed previously for this species using ordinary least-squares methods. Moreover, such a model has the appeal of generalization of the results over a region from which the plots were sampled; and also of calibration of parameters for newly sampled stands with minimal measurements.

scholarly journals Differentiating mature and old-growth forests in the Upper Foothills and Subalpine Subregions of west-central Alberta

2003 ◽  
Vol 79 (3) ◽  
pp. 602-612 ◽  
Author(s):  
Luigi E Morgantini ◽  
John L Kansas
Keyword(s):  
Forest Management ◽  
Growth Index ◽  
Tree Height ◽  
Tree Age ◽  
Old Growth ◽  
West Central ◽  
Decay Class ◽  
Management Area ◽  
Growth Attributes ◽  
Live Tree

Weyerhaeuser Company Ltd. is developing harvest strategies that will maintain appropriate levels of late to very late seral stages ("old growth") in its Drayton Valley Forest Management Area. This management area encompasses 490 570 ha in the Foothills and Rocky Mountain Natural Regions of west-central Alberta. In planning for future forest landscapes, Weyerhaeuser intends to maintain a range of age structures consistent with the ecological processes characteristic of each natural region and subregion. The absence of a discrete point separating mature forest from old growth means that the age at which a stand is currently identified as "old growth" and subject to special management practices is arbitrary. In a research study initiated in the summer of 2000, we seek to understand the differences in structure and composition between forests of various ages and topographic site conditions (elevation, aspect, and slope angle). Using 95 sampling plots in a 123-km2 study area in the Upper Foothills and Subalpine Natural Subregions, we quantified vegetation structure and composition for stands ranging in age from 70 to 300 years. Variables measured and analysed included live-tree height and diameter, snag density, diameter and decay class, downed woody material volume, diameter and decay class, vascular plant species richness, sapling and regeneration density, and duff depth. An old-growth index was developed for each sampled stand that took into account multiple attributes. Preliminary results indicate that specific attributes (snag basal area and density, decay stage and density of downed woody material, variation in live-tree age, and variation in live-tree height and age) separate a younger forest from a more mature one and hence may describe "old-growth" conditions. The age of onset of these old-growth attributes is variable but appears to occur between 160 and 180 years. Key factors other than stand age that contribute to or modify the development of old-growth attributes (as measured by the old-growth index) are elevation and moisture regime (as modified by site position). Further investigation is required to more accurately assess the effect of site factors on old-growth attributes. These results are now used by Weyerhaeuser to address retention of late seral stages in long-term forest planning. Key words: old growth, mature forests, old growth protection, forest management, Alberta, Weyerhaeuser, Rocky Mountains foothills

Effect of traffic-induced air pollution on seed germination of Arizona Cypress (Cupressus arizonica Green) and Black Pine (Pinus nigra Arnold)

2020 ◽  
Vol 55 ◽  
pp. 126841
Author(s):  
Zahra Babapour Aliyar ◽  
Abbas Banj Shafiei ◽  
Nasrin Seyedi ◽  
Salar Rezapour ◽  
Saeed Musavi Moghanjugi
Keyword(s):  
Air Pollution ◽  
Seed Germination ◽  
Pinus Nigra ◽  
Black Pine ◽  
Cupressus Arizonica
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