نوع مقاله : پژوهشی
نویسندگان
1 عضو هیئت علمی مرکز تحقیقات کشاورزی و منابع طبیعی آذربایجان غربی
2 استادیار مؤسسه تحقیقات جنگلها و مراتع
3 دانشجوی دکتری مرتعداری دانشگاه تهران
4 کارشناس مؤسسه تحقیقات جنگلها و مراتع
5 کارشناس ارشد مرتعداری دانشگاه علوم کشاورزی و منابع طبیعی ساری
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The goal of this research was determining of effects of different cutting intensities on generative and vegetative attributes of Koeleria cristata which is the key and most important species in Gharabagh Rangelands. First of all, half hectare area with suitable condition were selected and enclosed in the first year. Then 40 individuals plant were selected from this species and treated with 4 treatments including 25%, 50%, 75% and control harvesting with one background sample (each 10 individuals with one treatment). The influences of harvesting were determinate with study the changing of forage production, seed characteristics, vigurity condition and mortality of selected plant species. Results in split plot design during four years with SAS software were analyzed. The results showed that the effect of year, different harvesting and intensity interactions in different harvesting intensity on forage production and vitality of five species level is a significant percentage. The effect of yield showed that 75% harvest intensity had the lowest yield and stability and 50% harvest intensity had maximum stability. On the basis of this investigation the cutting intensity of 50% for this species were suitable and with the least negative effects plant characteristics. The results showed that increase of 75% in utilization and deterioration caused negative effects on the critical capabilities and harvest limit of 50% with the lowest incidence of adverse effects on plant characteristics and capabilities.
کلیدواژه‌ها [English]
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