Ghader Karimi; Saadat Mozafari; Mansour Nikbakht
Volume 16, Issue 3 , December 2009, , Pages 353-361
Abstract
The pressure of livestock grazing and overall utilization of rangelands have caused vegetation and siol degradation in many natural rangelands of Iran. Changes of canopy cover, species composition, forage production, in Margoon station were studied. In this study cover estimated by quadrates and forage ...
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The pressure of livestock grazing and overall utilization of rangelands have caused vegetation and siol degradation in many natural rangelands of Iran. Changes of canopy cover, species composition, forage production, in Margoon station were studied. In this study cover estimated by quadrates and forage yield were measured by clipping and weighting method. Results showed that species diversity in this region was relatively good (about 31 species). Palatability class I, II and III were 12.6, 27.5 and 9.5 percent respectively. Cover, density and yield of Bromus tomentellus and Hordeum bulbosum increased inside the station (enclosure). Also, canopy cover changed from 33.4 to 55.5 percent. Forage production increased from 309 to 569.8 Kg/ha due to management practices.
Ghader Karimi; Mohammad hassan Assareh
Volume 13, Issue 4 , February 2007, , Pages 402-409
Abstract
In this research salt tolerance and physiological characteristics of Atriplex verrucifera ecotypes in Tabriz, Qazvin and Arak rangelands were investigated. This species due to bushy form, salt resistant, proper proteine percent, is one of the native plants and valuable in saline ...
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In this research salt tolerance and physiological characteristics of Atriplex verrucifera ecotypes in Tabriz, Qazvin and Arak rangelands were investigated. This species due to bushy form, salt resistant, proper proteine percent, is one of the native plants and valuable in saline rangelands. These characteristics caused extensive use of this plant in rangelands reformation programs. The aim of this research paying attention to physiological parameters changes of salt resistant species ecotypes. Samples (soil and plant) of Atriplex verrucifera ecotypes were collected from Tabriz, Arak and Qazvin region and were analyzed. The experimental design was completely randomized design with 4 replications and 3 treatments (Tabriz, Arak and Qzvin). The studied parameters consisted of: water content relation, water potential, glycinebetaine, , proline, soluble sugars, starch, sodium, chlor, potassium, manganese, calcium, pH, Ec and soil texture. Results showed that rate of changes related water content, water potential, glycinebetaine, proline, soluble sugars, starch and ion accumulation in ecotypes were significant. Also in this research it was noted that salt resistant parameters in ecotypes dependent to climatic condition, soil chemical and physical characteristics. Results showed that Tabriz ecotype salt resistant parameters increased compared to others ecotypes.