elham fakhimi; Hossein Naderi
Abstract
Floristic studies are fundamental for the applied sciences such as rangeland management and conservation. Rangelands of Sadrabad with an area of 40000 hectares is jocated in South West of Yazd province that it remarkable habitat for the floristic studies. In this study the floristic list of the region ...
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Floristic studies are fundamental for the applied sciences such as rangeland management and conservation. Rangelands of Sadrabad with an area of 40000 hectares is jocated in South West of Yazd province that it remarkable habitat for the floristic studies. In this study the floristic list of the region is presented and their life forms and endangered species are distingushed Plants were sampled following the common method in the regional taxonomic studies and their families, genera, and species were determined using indispensable references. The life form of plant species was determined using Raunkier’s method. The results showed that 235 plant species belonging to 39 families and 169 genera exist in this area. Hemicryptophytes, Therophytes, Chamaephytes, Geophytes and Phanerophytes included 36.45, 25.65, 23.47 , 7.82 and 6.55% of the total species, respectively. Furthermore, the endangered species of the region were identified on the basis of IUCN criteria and Red Data Book of Iran. Accordingly, 43endangered species were identified, of which 34 were in lower risk (LR) class, , 7 species were in vulnerable (VU) class, and 2 were put in data deficient (DD) class.
Elnaz Hassanzadeh Kuhsareh; ardavan ghorbani; Mehdi Moameri; kazem hashemi majd; Ardeshir pounemati
Abstract
The purpose of this study was to determine the effects of altitude, slope, aspect and topographic index on life forms and total net primary production (NPP) in mountains meadows in Fandoghlou in Namin county in Ardabil province. NPP in three altitude, slope, topographic index classes and four aspect ...
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The purpose of this study was to determine the effects of altitude, slope, aspect and topographic index on life forms and total net primary production (NPP) in mountains meadows in Fandoghlou in Namin county in Ardabil province. NPP in three altitude, slope, topographic index classes and four aspect classes was estimated using one m2 plots (totally 180 plots) by harvesting and weighting method. Correlation between life forms and total NPP with topographic factors were analyzed using stepwise multivariate regression method and using derived regression equations, the maps of NPP were derived. Results show that different topographic factors has significant effects on forbs (p<0.01) and grasses (p<0.01), however on total NPP have no significant effects. The highest NPP of forbs (1584/1 Kg/ha) and total NPP (2339/3 Kg/ha) were observed in the second altitude (1525-1564 m) but has no significant effect on grasses. The NPP of grasses show direct relationship with slope, however the NPP of forbs were decreased with the increase of slope and has no significant effect on total NPP. The highest amount of grasses (894/3 kg/ha) and forbs (1875/5 Kg/ha) were observed in the south and northwest aspect, respectively. According to the various classes of topographic index, the maximum amount of grasses (853/4 Kg/ha) were observed in the first classes and the highest NPP of forbs (1568/6 Kg/ha) on the third classes. The results of this study can be used to balance the amount of biomass, carbon, the supply and demand of and to plan for proper rangeland management.
