Hosein Azarnivand; Ali Tavili; Ali Sadeghi Sangdehi; Mohammad Jafari; Mohamad ali Zare Chahouki
Volume 18, Issue 3 , September 2011, , Pages 372-383
Abstract
Understanding ecological needs of range species is of utmost importance for range managers in conservation and utilization of rangeland ecosystems. The current research was conducted to find out ecological characteristics of Astragalus squarrosus in Kashan. In each study area, soil sampling was performed ...
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Understanding ecological needs of range species is of utmost importance for range managers in conservation and utilization of rangeland ecosystems. The current research was conducted to find out ecological characteristics of Astragalus squarrosus in Kashan. In each study area, soil sampling was performed at depths of 0-30 and 30-60 cm along four transects. Vegetation sampling was done in three phonological stages of vegetative growth, flowering and seed ripening. Soil studies of the mentioned species showed that it mainly grew in soils with sandy loam to loamy sand textures, EC of 0/4 -4/2 ds/m and pH of 7/49 -8/17. According to the results of the vegetation studies, average of the current yield was 78/3 kg/ha and 1322/9 species per hectare was estimated as average of the density of A. squarrosus. Forage quality analysis at three phonological stages of vegetative growth, flowering and seed ripening showed that the amount of CP and OC were reduced up to 3.6% and 0/82 respectively. Decrease of DMD and ME and increase of ADF values at seed ripening stage was associated with a considerable decrease in palatability and subsequently forage quality.
Zainab Nurikiya; Akbar Javadi; Akbar Fakhireh; Ali Tavili; Mohammad ali Zare chahouki; Hamid reza Abbasi
Volume 16, Issue 4 , January 2010, , Pages 574-585
Abstract
The purpose of this research was to compare the amount of N, P and K in the soil under three rangeland species i.e. Agropyron tauri, Astragalus ammodendron and Bromus tomentellus and (with) the soil properties of the control area. After identifying the habitats (sites) of the mentioned species, soil ...
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The purpose of this research was to compare the amount of N, P and K in the soil under three rangeland species i.e. Agropyron tauri, Astragalus ammodendron and Bromus tomentellus and (with) the soil properties of the control area. After identifying the habitats (sites) of the mentioned species, soil sampling was done in all key areas at the end of the growing season based upon randomized systematic method. In order to study the features of the mentioned species, 10 plots (1 m2) were established along 4 transects.Soil sampling was carried out in the beginning and in the end of all transects from 0-10 and 10-40 cm soil depths. Soil sampling was also done in the control area and then N, P and K were measured. All data were analyzed and compared by T test. The results indicate that the amount of N, P and K in the first soil depth beneath Agropyron tauri is more than that in Astragalus ammodendron and Bromus tomentellus. In most cases the amount of N and K in the soil beneath (under) the species are more than that in the control area which indicates the increase of fertility in the soil beneath the species in comparison to the control area and it can be due to the litter fall or intensified biological activities of the organisms.
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 ...
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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).