نوع مقاله : علمی - پژوهشی
نویسندگان
1 دانشجوی دکتری جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران.
2 دانشیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه
3 دانشیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران.
4 استادیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
This study was performed in order to investigate the effect of deleting rare species and common species in compartment No.317 (managed forest) and No.318 (control forest) of Jamand district of Golband forest in Mazandaran (Noshahr). For this purpose, random-systematic sampling method with regular grid of 100×200 m was used to locate samples. The plot size was 400 m2 considering to tree and shrub species and in the center of each main plot, one 100 m2 subplot was set up for herb species. Estimate of percent cover of each plant species recorded using of Braun-Blanquet scale. DCA and NMDS ordination used and the results were compared by Procrust analysis.The results illustrated that deleting the rare species data had a little effect on output of ordination, although excluding of common species can change significantly output of ordination, and correlation between the raw data and removed common species is low. Generally, it can be concluded that the removal of rare species without losing too much information is a way to prevent probable errors but common species which have so much information should be retained.
کلیدواژه‌ها [English]
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