Evaluation of effects of different cutting intensities on generative and vegetative attribute of koeleria cristata in Gharebagh rangelands-West Azarbaijan province

Document Type : Research

Authors

1 Member of Scientific Board of Agricultural and Natural Resources Research Center of West Azarbaijan

2 Assistant Professor, Research Institute of Forest and Rangelands

3 Ph.D. Student in Range Management of University of Tehran

4 Expert of Research Institute of Forest and Rangelands

5 Master of Rangeland management, Sari University of Agricultural Sciences and Natural Resources

Abstract

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.

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History

  • Receive Date: 19 October 2012
  • Revise Date: 28 February 2013
  • Accept Date: 20 April 2013

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