Ebrahim Atarod; Naser Baghestani; Jalal Barkhordari; Ali Beman Mirjalili
Volume 25, Issue 2 , August 2018, , Pages 289-297
Abstract
This study was carried out in the Serizi- Bafq flood water spreading area of Yazd province. Vegetation sampling was performed in four flood spreading areas and the adjoining area as control in a completely randomized design. In order to investigate the vegetation changes, the transect-quadratic ...
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This study was carried out in the Serizi- Bafq flood water spreading area of Yazd province. Vegetation sampling was performed in four flood spreading areas and the adjoining area as control in a completely randomized design. In order to investigate the vegetation changes, the transect-quadratic method was used and three transects with a length of 100 meters were established. On each transect, 10 plots of 5×5(m2) were used. Collectively, 120 plots were installed inside the flood spreading area as well as in the control area. The parameters of canopy cover, density and presence of the plants in the flood and control areas were measured. The data were analyzed using t-test in SPSS software. The results showed that the percentage of canopy cover, density and presence of Hammada salicornia, Seidlitzia rosmarinus as well as the percentage of total canopy, total density and total species presence showed a significant difference at the 1% level. A significant difference was also found for litter coverage at the 5% level. The total percentage of annuals, Zygophyllum europterum, Salsola yazdiana, and Artemisia seiberi in the flood and control areas was not statistically significant. Flood water spreading operations have led to the presence of Zygophyllum europterum, Salsola yazdiana, and Artemisia seiberi. The vegetation percentage of these species is low in the current situation, but with repeated water logging in the flood spreading area, there may be significant changes in the long-term vegetation composition.
Jamal Emani; Ali Tavili; Essa Bandak; Mohammad Khosravi
Volume 17, Issue 2 , September 2010, , Pages 234-242
Abstract
Flood water spreading projections have been done with many objectives. One of these objectives is increasing vegetation cover. Flood water spreading leads to the increasing of soil moisture and as a result increasing forage production. In this study the effects of flood spreading are evaluated. This ...
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Flood water spreading projections have been done with many objectives. One of these objectives is increasing vegetation cover. Flood water spreading leads to the increasing of soil moisture and as a result increasing forage production. In this study the effects of flood spreading are evaluated. This assessment is done in aquifer of Mayhem district of Ghorveh state. In each rainfall that results into flood, 6 areas are flooded and 2 areas are not flooded. Therefore, 6 areas considered as the flood water spreading and 2 areas considered as the control site. The samplings of vegetation properties were performed in these eight areas. For this purpose, in each district, 5 transects each with a length of 100 m with 10 m interval from each other were situated and along each transect, 10 quadrates with an area of 1m were established. In each area, the characteristics of canopy cover percentage, forage production and species density were recorded. Analysis of data was performed using of un-paired T-test. Obtained results from T-test indicated that there is significant difference between canopy cover percentage (p≤ 0/1) and forage production (p≤ 0/05) while no significant difference was observed for species density in flooded and non-flooded areas. The results showed that the canopy cover increased from 41/91 percent in the control site to 62/18 percent in the flood spreading area. The forage production increased from 467/17 kg/ha in the control site to 632/17 kg/ha in the flood spreading area. Also the species density increased from 1/18 in the control site to 1/59 in the flood spreading area. Some of the plant species that are in the III classes from palatability aspect, decreased in the flood spreading area rather than control site.
Akbar Ghasemi; Heshmat Hydari; Farhad Fakhri; Davud Azadfar; Musa Sadeghi
Volume 16, Issue 3 , December 2009, , Pages 362-374
Abstract
Plant cover is one of the best index for recognizing and describing the environmental changes in the forest. This paper attempts to determine the effects of different desert soil classes on some distinctive plant vegetative characteristics. For the purpose of sustainable management, application of floodwater ...
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Plant cover is one of the best index for recognizing and describing the environmental changes in the forest. This paper attempts to determine the effects of different desert soil classes on some distinctive plant vegetative characteristics. For the purpose of sustainable management, application of floodwater spreading for irrigation of desert plants will meet increase the essential water supplies for desert plants, which in turn create the optimum conditions for desert plant growth. In order to examine the effects of flood water distribution on physico-chemical properties of soil and finally on vegetative characteristics of desert plants an area of approximately 300 hectares located at Tangestan flood water experimental station, in Bushehr, has been divided into three sections of each 100 hectares. Each section received different amount of flood water as entry (treatments).The process of irrigation have been conducted since 1997(11 years). Each section has been divided into two subdivision of upland and down-land subdivisions. Each subdivision has been divided into three secondary subdivisions (18 secondary subdivisions).In each secondary subdivisions soil samples were collected to study the physico-chemical properties of the soil, meanwhile in each secondary sub sample a Cluster sample of 4 plots were studied for the proposed vegetative characteristic of deserts plants: Prosopis juliflora, Ziziphus spina-christi and Acacia nilotica. The experiment has been conducted in the form of split plot design. The results indicate that the mean stem diameter, height and crown diameter differ significantly in sections; section number one has the best growth conditions. Comparison of subsections indicate that the upland and down-land mean stem diameter and crown diameter differs significantly in that the down-land has a better condition of growth. The comparison of soil physico-chemical properties indicate that there is a significant differences between sections and section one is dominated over the others.
Farzad Bayat Movahed; Seyed Ahmad Moosavi
Volume 14, Issue 2 , January 2007, , Pages 222-231
Abstract
Whereas more than 90 % of Iran is located in arid and semi-arid area, water is one of the most important factors that can prevent from sustainable development in all of agricultural subjects. Thus, the water can play an important role in ecological condition changes especially for plants. In this research, ...
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Whereas more than 90 % of Iran is located in arid and semi-arid area, water is one of the most important factors that can prevent from sustainable development in all of agricultural subjects. Thus, the water can play an important role in ecological condition changes especially for plants. In this research, it was attempted to survey the water harvesting and its spreading impact on plant composition changes in a flood spreader. The study area is located in the part of the Zanjan plain, in north-west of Zanjan city and between two rivers Sorhain and Qarecharian, which is include rain fed and released lands that, has been occupied by quaternary deposition. For this purpose, the amount of rainfall and diverted floodwater to the station monitored and measured during all flooding time. In order to evaluate the plant composition changes in three sites in spreading area and one in control site, totally 11 permanent transects (9 in spreading area and 2 as control) were stabilized and using Line Intercept Method, the canopy cover percentage of all species were noted and all species were distinguished. This study showed that some species under impact of floodwater spreading omitted, some increased or decreased, and some new species observed for first time. Increasing of the vegetation cover and appearance of palatable plants in last year showed that the floodwater spreading can improve the foliage production. Considering to life form of observed species, although perennial forbs increased, but the floodwater spreading in the case of establishment of perennial grasses did not operate successfully. Therefore, shortage of studying period (8 Years) and changes on amount of harvested floodwater make correctitude of these obtained results rather less valid.