Classification of forest communities (co-)dominated by Taxus baccata in the Hyrcanian forests (northern Iran) and their comparison with southern Europe

2021 ◽  
Author(s):  
P. Karami-Kordalivand ◽  
O. Esmailzadeh ◽  
W. Willner ◽  
J. Noroozi ◽  
S. J. Alavi
Keyword(s):  
Taxus Baccata ◽  
Southern Europe ◽  
Forest Communities ◽  
Northern Iran ◽  
Hyrcanian Forests

scholarly journals Analyzing the Biological and Structural Diversity of Hyrcanian Forests Dominated by Taxus baccata L.

Forests ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 701
Author(s):  
Seyed Jalil Alavi ◽  
Razieh Veiskarami ◽  
Omid Esmailzadeh ◽  
Klaus v. Gadow
Keyword(s):  
Species Abundance ◽  
Structural Diversity ◽  
Structural Features ◽  
World Heritage Site ◽  
Small Scale ◽  
Taxus Baccata ◽  
Natural Forests ◽  
Northern Iran ◽  
Hyrcanian Forests ◽  
Field Plots

The Hyrcanian Forests, well-known for its World Heritage site in the South Caspian region of Northern Iran, are refugia for a special tree flora. Some areas in particular feature a concentration of large and numerous trees of Taxus baccata, a species that has attracted the interest of many researchers given its medicinal importance. The objective of this study was to analyze the biological and structural features of these unique ecosystems based on three large tree-mapped field plots using new methods. We developed a species abundance distribution and three species–area relations, and analyzed the small-scale structural patterns of each of the 15 tree species that occur in the plots. Species-specific details are presented for each of the three field plots, including the tree densities and average tree sizes, as well as the associated structural indices “species mingling”, “dominance”, and “size differentiation”. This includes non-linear relationships between tree density and neighborhood mingling, and between the average tree size and neighborhood dominance, and a linear relation between the neighborhood dominance and the mean neighborhood differentiation. Based on the findings, we recommend the use of these methods and indices for analyzing the structure of natural forests in other regions of the world.

scholarly journals Diversity and Gradient Analysis of Common Yew (Taxus Baccata L.) Communities in Eastern Hyrcanian Forests, Northern Iran

2020 ◽  
Author(s):  
Omid Esmailzadeh ◽  
Meysam Soofi ◽  
Pari Karami
Keyword(s):  
Expert Knowledge ◽  
Environmental Gradients ◽  
Soil Depth ◽  
Environmental Parameters ◽  
Clay Content ◽  
Taxus Baccata ◽  
Northern Iran ◽  
Diagnostic Species ◽  
Hyrcanian Forests ◽  
Species Combination

Abstract Aims: To outline syntaxonomical synthesis of yew (Taxus baccata L.) in the eastern of Hyrcanian forest and to identify their main environmental gradients. Location: Jahan-Nama protected area (JNPA) as a unique yew population with heterogeneous floristically composition in the east of Hyrcanian forests, Northern Iran. Methods: Vegetation units were classified using modified TWINSPAN and were translated into syntaxonomic system. Syntaxa were determined by re-arrangement of each relevé based on diagnostic species occurrences and expert knowledge with the aim to increase the floristic distinctiveness of vegetation units. Syntaxa were finally evaluated by diagnostic species and environmental parameters according to phi- values and ANOVA, respectively. DCA was used to visualize the dissimilarity of syntaxa and their relationships with the environmental factors. We also used species combination concept for determining diagnostic species in the second association. Results: The classification of JNPA yew forests resulted in 6 Vegetation unites. These patterns were translated into four associations, two sub-associations and two variants. (Asso.1) Fago orientalis-Taxetum baccatae is found in northern aspects with lower slopes and higher soil depth; (Asso.2) Aceri velutini-Taxetum baccatae is occurring in the moderate but rocky slopes. Asso.1 and Asso.2 are the same in altitude and involving Carpinus betulus as a co-dominant. (Asso.3) Carpino betuli-Carpino orientale-Taxetum baccatae developed in the intermediate slopes. (Asso.4) Carpino orientale -Taxetum baccatae appeared in the highest slope of northeast and northwest aspects with shallow soil depth. The main factors determining the species composition of the JNPA syntaxa are slope, eastness, elevation and clay content. Conclusions: Our study provides the first syntaxonomic of yew communities in east of Hyrcanian forests and it also used the concept of species combination for exploring diagnostic species for proposing Carpino betuli- Carpino orientale- Taxetum baccatae association. We also showed that yew could be associated with different plant species which are distributing in different site suitability. It caused to have various yew syntaxa in JNPA and considerably reiterate high floristically and ecologically capacity of this area.

Duration of Last Interglacial Conditions in Northwestern Greece

2002 ◽  
Vol 58 (1) ◽  
pp. 53-55 ◽  
Author(s):  
Polychronis C. Tzedakis ◽  
Michael R. Frogley ◽  
Timothy H.E. Heaton
Keyword(s):  
Calibration Method ◽  
Southern Europe ◽  
Forest Communities ◽  
Last Interglacial ◽  
Ice Volume ◽  
Global Ice Volume ◽  
Northwestern Greece ◽  
Mis 5E ◽  
Pollen Records

AbstractA new astronomical calibration method for long pollen records from southern Europe is applied to the last interglacial interval of the Ioannina sequence, northwestern Greece. This shows that the last interglacial in this region, as defined by the presence of forest communities, lasted ca. 15,500 yr, from 127,300 to 111,800 yr B.P. Interglacial conditions developed within marine isotope substage (MIS) 5e and persisted into MIS 5d, lagging changes in global ice volume.

scholarly journals The Query of Suitable Areas for plantation and development of Taxus baccata L Species by Using GIS in Northern Iran

2014 ◽  
Vol 86 (3) ◽  
pp. 1497-1505
Author(s):  
ANOSHIRVAN ALAMI ◽  
ALIREZA ESLAMI ◽  
SEYED A. HASHEMI
Keyword(s):  
Analytical Hierarchy Process ◽  
Native Species ◽  
Taxus Baccata ◽  
Northern Iran ◽  
Ecological Characteristics ◽  
Multi Criteria Evaluation ◽  
Golestan Province ◽  
Ecological Parameters ◽  
Northern Forests ◽  
Hierarchy Process

Taxus baccata is a native species to the Caspian forests and is considered as the identification of these forests by some resources. The aim of this study was to understand the ecological characteristics of T. baccata in order to find suitable areas for its plantation in the Pone Aram preserve of Golestan province. Therefore, Multi-Criteria Evaluation (MCE) methods based on Analytical Hierarchy Process (AHP) were used. In this process at first the needed and effective natural indexes were used as 10 parameters. Then the final map of suitable areas for T. baccata plantation were produced based on Bolian and MCE models. According to the results, in Bolian method about 6218 ha of the total area of the study site (30554 ha) were estimated as suitable and semi suitable and 24336 ha were estimated as unsuitable for MCE model showed that about 2482 ha of the whole 30554 ha area of the study site is adequate for T. baccata plantation and 6181 ha is not adequate for T. baccata plantation. Regarding the results of the MCE and Bolian methods it has been concluded that for dynamic ecological parameters in delineation of suitable areas for T. baccata plantation the MCE weighting is more appropriate than Bolian. Using the results of this investigation it is possible to adequate areas for the presence of T. baccata and to execute a plan in order to facilitate the plantation of T. baccata in northern forests of Iran (watershed 88).

Classification of Australian forest communities using aerial photography, CASI and HyMap data

2008 ◽  
Vol 112 (5) ◽  
pp. 2088-2103 ◽  
Author(s):  
Richard Lucas ◽  
Peter Bunting ◽  
Michelle Paterson ◽  
Laurie Chisholm
Keyword(s):  
Aerial Photography ◽  
Forest Communities

scholarly journals First syntaxonomical contribution to the invasive Ailanthus altissima (Mill.) Swingle forest communities at its southern limit in Europe

2020 ◽  
Vol 57 (2) ◽  
pp. 145-160
Author(s):  
Silvia Montecchiari ◽  
Marina Allegrezza ◽  
Veronica Pelliccia ◽  
Giulio Tesei
Keyword(s):  
Urban Areas ◽  
Central Italy ◽  
Forest Community ◽  
Ailanthus Altissima ◽  
Soil Conditions ◽  
Southern Europe ◽  
Forest Communities ◽  
Southern Limit ◽  
Canopy Density

Ailanthus altissima (tree of heaven), an invasive alien tree native to China, has become invasive all over the world and in Italy is present in all the administrative regions where it can form dense forest communities. Although there are several ecological studies on this species there is a lack of floristic-vegetational data for southern-Europe. The study presents the results of a floristic vegetational study on A. altissima forest communities of central Italy that aims to highlight the possible floristic-vegetational autonomy of these coenoses. The results have allowed the characterization of A. altissima coenoses at the ecological, biogeographic, syntaxonomic and landscape levels. These represent first A. altissima syntaxa described for the Italian peninsula and for southern-Europe. We propose two new sub-Mediterranean and Mediterranean associations comprised in the recently described alliance Lauro nobilis-Robinion pseudoaciae, in the Chelidonio-Robinietalia order and the Robinietea class: Asparago acutifolii-Ailanthetum altissimae: forest community with stratified structure and high canopy density on the warmer slopes of the hills in dry soil conditions and low anthropic disturbance and Aro italici-Ailanthetum altissimae: paucispecific forest communities with a monolayered structure typically found in agricultural, and peri-urban areas on pelitic, alluvial silty-sandy substrates, in conditions of edaphic humidity and high anthropogenic disturbance. The comparison with literature data highlights the autonomy of these associations of the sub-Mediterranean and Mediterranean alliance Lauro nobilis-Robinion pseudoacaciae alliance from the Balloto nigrae-Ailanthetum altissimae association of the Central and SE-European Balloto nigrae-Robinion pseudoacaciae alliance.

Acer iranicum (Sapindaceae), a New Species of Maple from Northern Iran

2020 ◽  
Vol 45 (1) ◽  
pp. 163-172
Author(s):  
Mojgansadat Mohtashamian ◽  
Targol Chatrenoor ◽  
Foad Fatehi ◽  
Azad Rastegar
Keyword(s):  
New Species ◽  
Phylogenetic Position ◽  
Morphological Evidence ◽  
Northern Iran ◽  
Diagnostic Characters ◽  
Hyrcanian Forests ◽  
Upper Limits ◽  
Lowland Forests ◽  
A New Species

Abstract—Acer iranicum (Sapindaceae s. l., Aceroideae), from the upper limits of the lowland forests toward the midlands in the western part of the Hyrcanian forests, is described as new. Diagnostic characters for A. iranicum are sub-leathery to papery leaves, rounded, elongate sepals, oblong-ovate petals, and samara wings diverging at 55‐75°. The phylogenetic position of A. iranicum within Acer section Acer is elucidated based on analysis of the ITS data from representatives of all taxa within section Acer and morphological evidence. Acer iranicum was resolved as sister to A. opalus (Italian maple), but quite distant from all other species of maples in Iran.<fig><caption></caption><graphic xlink:href="i0363-6445-45-1-163-f1.gif"/></fig>

Sign in / Sign up

Export Citation Format

Share Document