Showing 5 results for Hyrcanian Forest
Volume 3, Issue 2 (6-2015)
Abstract
The present study aimed to assess pure planted species (i.e., Alnus subcordata L., Poplus deltoids L., Taxadium distichum L. Rich) and a mixed natural forest (i.e., dominated by Quercus castaneifolia C. A. Mey. - Carpinus betulus L. - Parrotia persica C. A. Meyer) on basis of some soil quality indices in Mazandaran Province, northern Iran. Sixteen samples per stand were taken from the top 10 cm of soil and bulk density, texture, water content, pH, EC, organic C, total N, available nutrients, earthworm biomass, microbial respiration, fine root biomass with organic C and total N of litter layer were determined. Nine criteria (i.e., silt, EC, K, Ca, Mg, microbial respiration, fine root biomass, nitrogen mineralization and litter C/N) were selected according to Principal Component Analysis (PCA) as Minimum Data Set (MDS). The analytical hierarchy process (AHP) method was employed to assign the data integration in an index. The calculated overall priority based on nine criteria, showed that the A. subcordata forest type had higher ecological potential (0.370) compared to the other stands. Whereas, P. deltoids mixed natural forest and T. distichum with ecological potential of 0.295, 0.213 and 0.122 had next priorities, respectively. As a conclusion, the N-fixing species, A. subcordata, was found more efficient in improving soil quality in degraded forest regions
Volume 5, Issue 1 (3-2017)
Abstract
Finding a minimum allowable radius length of a circle horizontal curve is essential to reduce earthwork cost or damage to the forest ecosystem, as well as make driving more comfortable. The present study is conducted i) to analyze different radius lengths of circle horizontal curves using an integrated approach consists of a Civil3D in concert with the field surveys, and ii) to propose a set of geometric design criteria which are more consistent with the existing condition of forest road network in Hyrcanian forest, north of Iran. Depth of the rutting (i.e., machine footprint) and soil mechanical properties are examined for a total of 36 existing horizontal curves with different radius lengths. Further, technical characteristics (i.e., stopping sight distance, horizontal sight line offset and turning speed) and a few parameters on pavement damage are included and incorporated into the research objective. No-statistical differences between radius lengths of the horizontal curve for classes of 10-15 and 16-20 m may associate with dissimilarity in the soil mechanical properties and in the dimension of the rut depth. These findings confirmed that it is therefore possible to shorten allowable radius length of a circle horizontal curve to at least 12 m under a longitudinal slope of 5% for forest road network in the north of Iran.
Arash Bakhshi, Masoumeh Shayanmehr, Mahmood Mohammadi Sharif, Eliye Yahyapour, Igor Kaprus,
Volume 8, Issue 3 (9-2022)
Abstract
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The focus of this study was to extend investigations on Collembola fauna in parts of Hyrcanian forests - Hezarjirib forests, located near Neka in Mazandaran province. For this, irregular samplings from leaf litter and soil in different localities were done during 2020–2021. The springtail specimens were extracted by Berlese funnel and after permanent slide mounting identified by relevant taxonomic keys. It resulted in the identification of 25 species belonging to eight families and 19 genera. Three species including Hypogastrura papillata Gisin, 1949 (Hypogastruridae), Lepidocyrtus bicoloris Mateos, 2012 (Entomobryidae) and Folsomia trisetata Jordana & Ardanaz, 1981 (Isotomidae) were recorded for the first time from Iran. Brief information for each species including the material studied, distribution and some illustrations of the new records are given.
Volume 9, Issue 2 (2-2020)
Abstract
Two genera, Aneuropria Kieffer and Diapria Latreille and two species, Aneuropria foersteri (Kieffer, 1910) and Diapria conica (Fabricius, 1775) (Hymenoptera: Diapriidae) are recorded from Iran for the first time. The specimens were collected using Malaise traps from Hyrcanian forests of Mazandaran, Gulian and Golestan provinces in northern Iran. Diagnostic characters and geographical distribution of the newly recorded taxa are presented.
Masoumeh Shayanmehr, Elham Yoosefi Lafooraki, Thomas Tully, Cyrille Dhaese, Mehdi Ghajar Sepanlo,
Volume 10, Issue 1 (3-2024)
Abstract
The present study reports new records of the Collembola (Arthropoda: Hexapoda) from the Bula Hyrcanian forest located in Mazandaran province, north of Iran. The results show two genera Spatulosminthurus Betsch & Betsch-Pinot, 1984 (Sminthuridae) and Wankeliella Rusek, 1975 (Tullbergiidae) and five species including Anurophorus alpinus Potapov & Stebaeva, 1990 (Isotomidae), Pseudosinella cf. decipiens Denis, 1924 and P. immaculata (Lie Pettersen, 1896) (Entomobryidae), Superodontella tyverica Kaprus, 2009 (Odontellidae), and Wankeliella bescidica Smolis & Skarżyński, 2004 (Tullbergiidae) are new records for Collembola fauna of Iran.
