Saeid Rashvand; Hoshmand Safari; Parvaneh Ashouri sanjabi
Volume 19, Issue 2 , September 2012, , Pages 355-369
Abstract
In this study, sustainability of forage production in some rangeland species of mountainous rangelands of Alamut Qazvin was investigated. These mountainous rangelands are located in the highlands of North-Eastern city of Qazvin as a part of south basin of central Alborz Mountains. The rainfall of these ...
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In this study, sustainability of forage production in some rangeland species of mountainous rangelands of Alamut Qazvin was investigated. These mountainous rangelands are located in the highlands of North-Eastern city of Qazvin as a part of south basin of central Alborz Mountains. The rainfall of these natural environments is 400 mm per year. Long dry season is considered as the main characteristics of the natural environments of these ecosystems. Production per hectare of 24 species was studied during four years. Combined analysis of variance for dry forage production (kg/ha) showed significant differences (p>0.01) among species and the years. According to the results of mean comparisons (Duncan’s multiple test) and cluster analysis (Ward method), Eryngium billardieri, Cousinia esfandiari, Artemisia aucheri, Verbascum speciosum, Agropyron intermedium, and Cirsium haussknechtii had higher forage production. Interaction effect of species * year was significant at 1% probability level and sustainability parameters were calculated based upon average forage production. Parameters of CVi, S2di and R2 had similar trends in introduction of sustainable species and most of them showed low forage production based upon these parameters. Parameters of Bi, W2i and S2i also showed the same trend in expression of sustainability and on the basis of these three parameters, an average forage production was recorded for most of sustainable species. In general, Cousinia esfandiari and Artemisia aucheri showed appropriate production sustainability based upon most sustainability parameters. Agropyron intermedium and Cirsium haussknechtii were not sensitive to adverse conditions while Verbascum speciosum and Eryngium billardieri were sensitive to adverse conditions. Therefore, Agropyron intermedium and Artemisia aucheri could be introduced for range improvement programs.
Mahmood khosravi fard; Abbas ali sandgol; Ahmad Akbarinia
Volume 13, Issue 2 , February 2006, , Pages 94-101
Abstract
About 15% of Iranian lands are affected by salinity. Species of chenopodiacea family, such as Atriplex canescens is special for planting in these area. This study was conducted from 1993 to 2003 in Nowdehak rangeland station of Qazvin province. objectives of this research were planting density of Atriplex ...
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About 15% of Iranian lands are affected by salinity. Species of chenopodiacea family, such as Atriplex canescens is special for planting in these area. This study was conducted from 1993 to 2003 in Nowdehak rangeland station of Qazvin province. objectives of this research were planting density of Atriplex canescens. The statistic design was split split plot (using on CRBC) with three replication. Main plot were density (2´2, 4´4, 6´6 meter), sub plots were pruning period (annual, binnial, triennial) and sub sub-plot were hight pruning (control, complete pruning, 20, 40, 60 heights). Result showed that planting density and pruning had significant effect on forage yield (P<0.01). Planting density 2´2 m had higher yield than others treatments. Complete pruning and pruning 20 cm height had no differet yield but produced forage were higher than other treatments. Triennial pruning preiod was better than anuual and binnial praning priod in respect of forage yield. Generally result showed that in this area and similar zone planting, distance (2´2m) with triennial pruning and complete pruning had maximum forage yield.