Horizontal array study and plant cover zonation of Choghakhor wetland (W Iran) (original) (raw)
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Nova Biologica Reperta, 2015
Boujagh National Park, with water ecosystems including Boujagh and Kiashahr wetlands, has an area of approximately 3477.3 hectares. In order to study factors affecting the vegetation in aquatic and wet habitats, 44 releves were implemented in the region. To test the chemical properties of the available water, samples were collected from 22 releves. The results of a two-way species indicator analysis of the modified TWINSPAN suggested that four groups of plants were present in the region. The first group being floating, immersed and submerged and the third and fourth groups being mostly helophytic. The second group of plants grows in areas with sand and mud. The results of comparative DCA analysis of water factors (PH, Depth, P, N, Cl, CO 3 , Hco 3 , EC, Na, K) showed a significant correlation between the factors and plant groups and the most important factors influencing the distribution and separation of plants was found to be water depth. In addition, Boujagh and Kiashahr wetlands vegetation map, based on the plant groups, was also prepared.
ﺟﻠﺪ 24 ﺷﻤﺎره ، 2 ﺻﻔﺤﻪ ، 403-392) 1396 (وﻳﮋﮔﻲ از ﺑﺮﺧﻲ ﺑﺮرﺳﻲ در اﻧﺪﻣﻴﻚ ﻣﺮﺗﻌﻲ ﮔﻮﻧﻪ ﺳﻪ روﻳﺸﻲ و ﻣﺤﻴﻄﻲ ﻫﺎي آذرﺑﺎﻳﺠﺎن اﺳﺘﺎن ﺷﺮﻗﻲ ﻃﻴﺐ ﻧﺎزﻳﻼ ﻧﮋاد 1 ﻋﺼﺮي ﻳﻮﻧﺲ ، 2 * ﭘﺎﻛﺮوان ﻣﻨﻴﮋه ، 3 ﻧﺠﻴﺐ ﻣﺤﻤﺪرﺿﺎ و زاده 4 ﺟﻠﺪ اﻳﺮان ﺑﻴﺎﺑﺎن و ﻣﺮﺗﻊ ﺗﺤﻘﻴﻘﺎت ﻓﺼﻠﻨﺎﻣﻪ 24 ﺷﻤﺎره 2 393 ﺟﻠﺪ اﻳﺮان ﺑﻴﺎﺑﺎن و ﻣﺮﺗﻊ ﺗﺤﻘﻴﻘﺎت ﻓﺼﻠﻨﺎﻣﻪ 24 ﺷﻤﺎره 2 403 Abstract Acantholimon gilliatii, Astragalus aharicus and A. neo-mobayenii are the endemic species with one population in East Azarbaijan. Previous observations of researchers have shown that survival of these species at risk and their distribution is being limited. In this study, topographic, climatic and soil characteristics were investigated in habitats of these species. Also, coverage, height density and phenology of the study species were determined by using 10 plots in each area with random method during 2013 and 2014. The habitat of A. gilliatii is very limited in the southern slopes of ...
Journal of Water and Soil Science
To determine the nitrate pollution (water, soil, and tubers) in small (< 0.5 ha), medium (0.5-1 ha) and large (> 1 ha) size of potato fields, this study was conducted in Fereidan region of Isfahan province during growing season of 2014-2015. For this purpose, the amounts of inputs and the tuber yield were recorded in each farm. Also, average nitrate-N concentration in irrigation water, soil and tubers of different potato farms were measured before planting and after harvesting. The results showed that the average soil N-nitrate concentration in small, medium and large size farms were 16.3, 17.4 and 19.9 mg kg-1 before planting and 10.3, 13.3 and 23.3 mg kg-1 after harvesting, respectively. The average N-nitrate concentration of irrigation water in small, medium and large size farms were 36.3, 27.1 and 19.5 mg L-1 before planting and 47.6, 33.1 and 16.4 mg L-1 after harvesting, respectively. After harvesting, NO3-N concentration of irrigation water was below the standard range concentration (45 mg L-1) in the all large farms while 87 % of small and 85% of medium farms showed more than standard concentration. The nitrate concentrations of tubers in large-sized farms were lower than others. The tuber NO3-N concentration was affected by potato cultivar. The lowest concentration of nitrate was observed in the late-season potato cultivars (Agria). That might be associated with greater tubers yield.
Technical Note: Study the Groundwater Nitrate Pollution in the Mian-Jungle Region, Fasa, Iran
2013
Nitrate in high dosage may cause serious diseases for both human beings and animals. WHO has set 45 mg/l as the maximum permitted level for nitrate in drinking water. High concentrations of nitrate in drinking water of the Mian Jungle region of Fasa, located 120 km south east of Shiraz, caused inhabitants to avoid using groundwater as the source of drinking water. Main objectives of this study were i) to determine the main sources of nitrate in the groundwater and ii) to introduce a feasible nitrate removal method in the region. Monthly groundwater sampling were carried out from April 2010 to March 2011 for 15 sources including water wells and outcropped springs. Nitrate, EC, and pH were measured in situ, however remaining parameters were determined in the lab using standard methods. Amounts of nitrate changed from 3.1 mg/l to 259.4 mg/l in diferent times and locations in this region. Results showed that an internal and external background of nitrate in groundwater are originating f...
journal of watershed management research, 2017
Regional analysis is the stability method to improve estimates of flood frequency, which has become one of the dynamic sectors in hydrology and the new theories are testing, constantly. Application of geostatistical method is an innovation in this field for regional flood analysis.This technique is based on the interpolation of hydrological variables in the physiographical space instead of using common geographical space. However, the hydrological, climatological and physiographical information of 38 river basin information of watersheds inside of Mazandaran province were obtained and Canonical Kriging method was used for regional flood analysis whit return periods of 10, 20, 50 and 100 years. The Canonical Correlation Analysis was used to design physiographic space by the geomorphoclimatical variables affecting the flood. The Gaussian model had the best fit to semi-variogram model in all return periods and the geostatistical method of Ordinary Kriging was used for regionalization. Results evaluated using Jack Knife mutual procedure and the five statistical indexes. The performance of NASH was obtained over than 0.9 in all of return periods, which implies the accurate and acceptable predictions of flood in ungauged basins. The other indicators led to satisfying results, too. According to the results of relative statistical indicators accuracy regional estimates improves as long as return periods increase. These results showed that application of Canonical Kriging method is effective and practical approach for regional flood analysis.
2016
In this study, management plan was developed for normal and critical scenarios in the Chehel-Chai watershed. Landslide distribution map of the study area was created using air photos interoperation and field studies. Landslide management plan also was suggested for five management strategies: without management program, low-risk tolerance, zero risk tolerance, avoiding of risk and controlling measures. The management plan was developed for both normal and critical scenarios. Additionally, multi-criteria evaluation was used to calculate the management score. Results show that in the two normal and critical scenarios, 6.67% and 11.8% of the Chehel-chai watershed need controlling measures, respectively. In contrast, 37% and 12.57% of the study area are identified as the areas that do not need any intervention (without management program), with respect to the two scenarios respectively. The kappa index of agreement for the management plan maps corresponding to both scenarios was calculated as 0.64 suggesting that there is 36% difference between the two management plan scenario maps. The implementation of the landslide management plans based on this research in local and regional scales can solve the problems arising from hill slope instability. This can lead to appropriate watershed management practices and therefore to achieve sustainable development.
2012
Spectral decomposition has provided a means for observing those features in seismic data that are not always clear in the time domain. There are several approaches that can be used to produce a spectral decomposition of a seismic trace. A case history of using the spectral decomposition and coherency to interpret incised valleys was shown by Peyton et al. (1998). Partyka et al. (1999) used a windowed spectral analysis to produce discretefrequency energy cubes for applications in reservoir characterization. Continuous wavelet
Distribution survey and some biological aspects of Water Hyacinth in Anzali Wetland, Guilan province
Zīst/shināsī-i Giyāhī-i Īrān, 2019
Water Hyacinth, Eichhornia crassipes is one of the world's worst weeds. It originates from Amazonia and be invader to other areas in the worldwide. It has recently been detected in several natural areas of northern part of Iran such as Anzali Wetland. Here, distribution of Water Hyacinth was studied in Anzali Wetland during 2015-2018. Also some biological characteristic including; evapotranspirative water losses, surveillance against salinity gradients and nutrient effect on biomass production of root and green parts were investigated. Water Hyacinth infestation was observed from 7 to 84 points of Anzali Wetland with 100 to 1000 m2 in different years. The distribution of Water Hyacinth was limited in summer of 2017 because of a prolonged temperatures below freezing winter. The seed was germinated in study area after two years. The water losses were estimated up to 2.5 times more from Water Hyacinth compared to open water. While the mortality of Water Hyacinth was observed in sal...