investigation of changes in rangeland vegetation regarding different slopes, elevation and geographical aspects (case study: yazi rangeland, noor county, iran)

نویسندگان

hamid reza saeedi goraghani

mojtaba solaimani sardo

nabi azizi

ali azareh

sara heshmati

چکیده

in many studies, topographic factors have been considered as an important factor in establishing the vegetation in different ecosystems. so, it affects vegetation composition and diversity by influencing soil moisture, fertility and soil depth. the aim of this research was to investigate the effects of slope, elevation and geographical aspects on species growth, forage production and vegetation cover in yazi rangeland, noor province, iran. sampling was done along three transects with the length of 150 m in each unit. along each transect, 15 plots (1 m2) were established with 10 m distances. in each plot, species name, growth form, cover percent and soil surface percent such as percentages of stones, pebbles and amount of litter were recorded. also, the rangeland production was measured by the clip-and-weigh method. data were analyzed and mean comparisons were done using duncan method. results showed that the geographical aspects had significant impacts on forage production, vegetative form and species composition. northern aspects had the highest forage production rate and species frequency. also, elevation had a significant effect on forage production and vegetative form so that the elevation of 1600-1900 m and 2200-2500 m had the highest and lowest effects. also, according to forage production and vegetative form in the range of slope classes, it is specified that it has also a significant effect on forage production seen in higher slopes.

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عنوان ژورنال:
journal of rangeland science

ناشر: islamic azad university, boroujerd branch

ISSN 2008-9996

دوره 4

شماره 3 2014

میزبانی شده توسط پلتفرم ابری doprax.com

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