НАУКА ЗА ГОРАТА, КН. 1, 2003
FOREST SCIENCE, No 1, 2003
OF WOODY PLANTS BIODIVERSITY
Moslem Akbarinia, Seyed Mohsen Hosseini
Department of Forestry, Faculty of Natural Resources,
Tarbiat Modarres University,
Noor, Mazandaran, Iran
Abstract: In this study plant biodiversity is define as variety, population structure and
frequency models (P a r t h a s a r a t y, 1977) that for Iranian native conifers forests were
evaluated. The biodiversity of Cupressus sempervirens, Taxus baccata and Thuja orientalis in
several sites of Hyrcanian forests of Iran such as Hasanabad, Zarringol, Afratakhteh, Vaz and
Soorkesh forests were studied. In these sites several ecosystems units by using the composition of
maps of slope, aspect, elevation and soil were recognized. In plots of 2500 m2 list of all plants
and the number of woody plants were recorded. For comparison between sites common formulas
of biodiversity were applied but these formula showed didn’t have accurate results for these
forests. Thus some new formulas were planned. Results show biodiversity decreased by elevation
which related to temperature and precipitation. Biodiversity decreased from west to east that is
related to the decrease of precipitation in this area. The west and north aspects have a better plant
biodiversity as well as the soil has most effects on biodiversity.
Key words: Biodiversity, Iranian conifers, Hyrcanian forests