Ali Ehsani
Volume 10, Issue 2 , September 2019, , Pages 215-236
mohammad Amin Soltanipour; Saeedeh Nateghi; Ali Ehsani
Volume 26, Issue 2 , July 2019, , Pages 271-281
Abstract
To determine the phenological stages and plant height of three important range species Aeluropus lagopoides, Desmostachya bipinnata and Halocnemum strobilaceum, this investigation was carried out for four years starting in 2007 in Zaminsang Rangelands of Hormozgan province. In this study, the information ...
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To determine the phenological stages and plant height of three important range species Aeluropus lagopoides, Desmostachya bipinnata and Halocnemum strobilaceum, this investigation was carried out for four years starting in 2007 in Zaminsang Rangelands of Hormozgan province. In this study, the information about the phenology and plant height for 10 individuals of each species in 10-day intervals was measured and recorded. The results showed that phenological stages of three species were different in the study years, so that plant growth started 2-3 weeks earlier in wet years and later in dry years, while the duration of vegetative and reproductive activity of plants was different. The results showed that vegetative growth started with cooling of air and the onset of rainfall. The growth period of A. lagopoides, D. bipinnata and H. strobilaceum was 6, 6.5, and 10 months, respectively. The vegetative growth of A. lagopoides started from 22 December, whereas the vegetative growth of D. bipinnata and H. strobilaceum started from 20 February. The flowering stage started from April, June, and September, and the seeding stage from 22 April, 22 July, and 15 October, respectively. The dormancy period of plants started in 22 May, 1 September, and 22 December, respectively. Since Aeluropus lagopoides is a palatable and dominant species in the Zaminsang region, the time of arrival and departure of livestock is recommended to be late November to late May.
Somayeh Dehdari; Masoomeh Movaghari Rodposhti; Zohreh Khorsandi Koohanestani; Ali Ehsani
Volume 25, Issue 1 , April 2018, , Pages 227-234
Abstract
The reduced biomass in forests and rangelands ecosystems for any reason can affect the process of carbon sequestration and as a result of global warming. This study was conducted to assess carbon storage under different grazing intensities in rangeland of Chah Mary dominated with Artemisia ...
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The reduced biomass in forests and rangelands ecosystems for any reason can affect the process of carbon sequestration and as a result of global warming. This study was conducted to assess carbon storage under different grazing intensities in rangeland of Chah Mary dominated with Artemisia siberi in Khuzestan province. Three sites under heavy, moderate and low grazing intensities were selected based on similar topographic features (slope, aspect and elevation), rainfall, soil and climate. Plant sampling was done in key areas by random-systematic method along three transects of 100m and 60 plots of 1m2. Then, aerial and underground biomass parameters were evaluated in each plot and carbon was determined by ash method. The data were analyzed by SPSS v.16 software. According to the results, carbon sequestration decreased from 5704/3 in the low-grazing region to 3470/1 in the high-grazing region. Also, under low-grazing intensity, the carbon stored in aerial biomass and underground biomass was 4360/9 and 2180/5, respectively.
Seyyed Ali Hosseini; Ali Ehsani
Volume 24, Issue 3 , October 2017, , Pages 635-645
Ahmad Mousavi; Ali Ehsani; Farhad Aghajanlou
Volume 23, Issue 2 , September 2016, , Pages 208-197
Abstract
Phenology studies are one of the appropriate tools to determine the utilization time of rangelands.This research was aimed to study the phenology of Festuca ovina in the Bademestan rangelands of Zanjan province, located at 45 km northeast of Zanjan for four years. The results showed that the study species ...
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Phenology studies are one of the appropriate tools to determine the utilization time of rangelands.This research was aimed to study the phenology of Festuca ovina in the Bademestan rangelands of Zanjan province, located at 45 km northeast of Zanjan for four years. The results showed that the study species had a very special reaction to the rainfall amount and time, especially during the growing season i.e., from the onset of spring to July. In other words, no reproductive growth and formation of flowers were recorded in 2007-2008, whose rainfall was much less than average during the growing season (57.2 mm in the spring quarter). A sharp decline in rainfall during the spring caused the species not to complete its phenology and produce seeds. The year 2009-2010 had much less rainfall as compared with the year 2007-2008; however, due to the good rainfall in spring 2010, Festuca ovina could complete all phenological stages and flowering stage occurred. Therefore, it seems that the spring rains are vital for this species to complete the plant life cycle.
Farideh Saghafi Khadem; Ali Ehsani; Masoumeh Shahabi
Volume 23, Issue 1 , June 2016, , Pages 92-107
Abstract
Studying the phenology of range species is an important factor in management actions for optimal utilization of these species. On the other hand, drought and stresses arising from it cause to the changes in plant growth stages, affecting forage yield. Bromus kopetdaghensis ، Festuca arundinacea ...
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Studying the phenology of range species is an important factor in management actions for optimal utilization of these species. On the other hand, drought and stresses arising from it cause to the changes in plant growth stages, affecting forage yield. Bromus kopetdaghensis ، Festuca arundinacea ، Stipa arabica and Poa bulbosa are the main elements of semi-steppe areas to dry forests of Khorasan rangelands as relatively palatable species, grazed by livestock. In the current research, phenology of the mentioned species was studied during 2007-2010. Moisture conditions and drought classes were also studied by Standardize Precipitation Index (SPI) in rangelands of Binalood, Khorasan Razavi province in a twenty-year period. Effects of different drought periods were investigated on emergence of plant organs and the period length of vegetative and reproductive stages. Results showed that reproductive growth was shorter during drought period. Under drought conditions of 2008, vegetative growth was started earlier compared to other years and the change from vegetative to reproductive stage occurred in a shorter period. Results of growth degree-day showed that the range was from 2814.12 in 2010 to 2406.95 centigrade degree in 2008. Consequently, GDD model could be used with relatively high accuracy in determining the appropriate time for livestock entry and exit.
Sedigheh Zarekia; Niloofar Zare; Ali Ehsani; Farhang Jafari; Hasan Yeganeh
Volume 19, Issue 4 , March 2013, , Pages 614-623
Abstract
Each of the range species has certain production in different months and years of grazing seasons. Without understanding the production characteristics of species during grazing season, planning and livestock management is not feasible. Therefore, understanding the annual and monthly production of different ...
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Each of the range species has certain production in different months and years of grazing seasons. Without understanding the production characteristics of species during grazing season, planning and livestock management is not feasible. Therefore, understanding the annual and monthly production of different rangeland types is essential for efficient and effective management of livestock grazing. Consequently, relationships between forage production and climatic variables should be studied. For this purpose, annual forage production was measured in research exclosure of Khoshkerood-Saveh during 2007-2010 by clip and weigh method. Monthly rainfall in this period was calculated using Saveh synoptic station data and then the amount of cumulative rainfall in winter and spring of each year was calculated. Afterward, the relationship between production and winter and spring rainfall as well as rainfall of different months of winter and spring was studied separately. Statistical analysis was performed using Minitab software. Results showed that winter rainfall had no significant impact on the production of perennial species. However, cumulative rainfall in winter and spring showed different effects on forage production of the species. In other words, a significant relationship was observed between the production of Artemisia sieberi and Salsola laricina and rainfall while no significant relationship was recorded between the production of Stipa hohenackeriana and Poa sinaica and rainfall. Also, there was a significant relationship between cumulative rainfall in March and April and annual production of the species