Naser Ansari; Mohammad Fayaz; Mohammad hassan Gasemi
Volume 16, Issue 3 , December 2009, , Pages 293-304
Abstract
Rangelands degradation is the most important problem of Iran natural resources, especially in these decade .In this research for determination of the quality and quantity of rangelands degradation,9 provinces distributed within 3 main zones of Henry Pabbot’s climatic zones map of Iran territory, ...
Read More
Rangelands degradation is the most important problem of Iran natural resources, especially in these decade .In this research for determination of the quality and quantity of rangelands degradation,9 provinces distributed within 3 main zones of Henry Pabbot’s climatic zones map of Iran territory, were selected. In these provinces, sample areas in each climatic zone were bounded on topographic maps. In the sample areas, converted rangelands to other usages, from 1955 to 1995(40 years) and then, lost and converted rangelands clarified. Considerable decline in forage production of the rangelands were also well described by comparing dry matter yield in an enclosure and the fenced area. Results showed that 9.1% of the rangelands areas, during 40 years between 1955-1995 periods, had been disappeared. Rangelands degradation in semi-desert zone with degradation index of 28.4% is lowest and in high-mountain zone with degradation index of 60.5% is the highest one. Degradation intensity in high-mountain zone is as twice as semi-desert zones. Average of degradation index for all the country zones, is 49.4% that revealed, about half of the production potential of the rangelands has been lost.
Abbas Hente; Naser Ansari; Mohammad ali Zare chahuki
Volume 15, Issue 3 , January 2008, , Pages 360-368
Abstract
This study was conducted to evaluate Atriplex canescens planting in Zarand-e-Saveh rangelands. For this purpose, a questionnaire about effects of Atriplex planting was prepared to be replied by randomly selected people whose herds use the rangelands. The questions were answered by 35 persons in ...
Read More
This study was conducted to evaluate Atriplex canescens planting in Zarand-e-Saveh rangelands. For this purpose, a questionnaire about effects of Atriplex planting was prepared to be replied by randomly selected people whose herds use the rangelands. The questions were answered by 35 persons in 9 different villages. According to the answers, vegetation cover of the subject rangelands has been improved, the composition of herds is constant, and Atriplex plants are used only for grazing. Most of the herders believe that planting by Atriplex resulted in increase of production and quality of range forage, and consequently dairy products and meat production were boosted. Herders think that the fauna of the area has been changed. Conversely, some herders declare that grazing of Atriplex caused some gut damages, diarrhea and abortion in grazing animals. We believe that the reasons of these problems are early season grazing and also lack of diversity in plant composition (mono culturing).