Showing 5 results for Madadi
H. Madadi, M. R. Ashrafzadeh,
Volume 1, Issue 2 (3-2013)
Abstract
Effective river ecosystem management requires that the existing hydrologic regime be characterized in terms of the natural hydrologic regime and the degree to which the human-altered regime differs from natural conditions. This is known as Range of Variation Approach (RVA) and can be used for variation of stream flow, range of variation and appraisal of dam impacts on riparian zones. In this paper, we used 31 hydrologic parameters, classified into five groups, monthly flow indices, extreme flow indices, timing indices, high-flow and low-flow indices, and rate of change, to assess hydrologic regime alteration in downstream of Karkheh dam. For this, purpose the hydrologic parameters of Pay-Pol hydrometric station have been taken. into consideration. As the Riparian ecosystems are highly dependent on and sensitive to variation in the hydrological cycle, the focus of this study was the 50-meter buffer of the Karkheh River. To examine the impacts caused by the variation of hydrologic regime, we tested if this variation and 8 different landscape metrics in the study area are correlated. The results showed that variation of hydrologic regime had a significant impact on the landscape structure of riparian zone in Karkheh downstream and caused isolation in landscape pattern of the woodland cover. Therefore, landscape structure in Karkheh downstream is highly correlated to hydrologic processes of upstream of the river. It can be concluded that an effective water management strategy is keeping safe the ecological condition and integrity of the riparian zone of Karkheh. This happens when all the hydrologic parameters are in the natural range of variation as they were before dam construction.
H. Madadi, H. Moradi, S. Fakheran, M. Jokar , T. Makki,
Volume 3, Issue 9 (12-2014)
Abstract
The most common sources of environmental noise are human transportation systems which can have catastrophic effects on physiology and behavior of wildlife species. Spatial models of noise propagation from roads in ecological sensitive region could be very useful tools for prediction of roads impacts. The goal of our study was to apply a straightforward, accurate, and affordable approach for modeling noise impacts from Isfahan’s west ringway, which passes through Ghamishloo wildlife refuge. We used the System for the Prediction of Acoustic Detectability noise model (SPreAD-GIS). For this study, land use map, meteorological data, topography map, and noise source characteristics were used as the model inputs. We compared the model results to wildlife occurrences to evaluate how noise effects could impact threatened animals. The key affected species of the study area Goitered gazelle (Gazella subgutturosa) and wild sheep (Ovis orientalis isphahanica), were considered for impact analysis. The results showed that in the areas with noise intensity lower that 20 db the animal has no actions and the area is known as “calm area”, however the areas with noise intensity higher than 20 db is as “disturbance and action” area. The comparison of the results of both species showed that the results vary based on their habitat and behavior, and we found the higher noise impacts on distribution of Goitered gazelle in the study area.
M. Madadizadeh, J. Kambouzia, S. Soufizadeh,
Volume 6, Issue 2 (9-2017)
Abstract
In order to evaluate phenologic and thermal time response of three maize hybrids (KSC 704, Maxima and TWC 604) in different rates of nitrogen (0, 92, 220 and 368 kg ha
-1), a two-year experiment was laid out as a randomized complete block design with a factorial arrangement of treatments and three replications in 2014 and 2015. Results showed that nitrogen and genotype had a significant effect (p<0.01) on leaf appearance rate, phenology and grain yield of maize hybrids. In both years, nitrogen stress postponed the tasseling, silking and physiological maturity occurrence in hybrids and increased their thermal time requirements, but this effect was more severe in the second year. The thermal time required for all of the phenological stages of hybrids showed significant increase only in control treatment, compared with other N rates and there was no significant difference among other N rates from this viewpoint. Significant yield benefits of KSC 704 and Maxima compared to TWC 604 was observed. Among the studied hybrids, Maxima is recommended due to the shorter growing season duration, lower thermal time requirement and faster germination rate under N stress
H. Madadi, H. Moradi, A. R. Soffianian, A. Salman Mahiny,
Volume 6, Issue 2 (9-2017)
Abstract
Noise pollution of roads can propagate within a broader extent than the road only. This spatial space is called "road ecological effect zone" which is known as the natural areas exposed by 40 dB or greater noise level in both sides of the road. In this study, using Calculation of Road Traffic Noise (CRTN) model, the propagation range of noise from Lorestan road network was simulated. Then, the natural habitats of oak forests, scattered woodlands, and grassland affected by the zone were analyzed. The results showed that the road ecological effect zone is between 50 to 2000 meter based on 40 dB noise level. Besides, the habitats within Khorramabad, Poldokhtar, and Karkheh watersheds are receiving the most effects from the road networks. In addition, in the studied area, 6.2% of oak forests, 8.4% of scattered woodlands, and 12.1% of grasslands are within the road ecological effect zone. Moreover, 7.4% of the protected areas in Lorestan province are under effects of road traffic noise, where Chahaeshakh no-hunting zone with 42.6%, Poldokhtar wetlands with 28.6%, and Azna-Doroud wildlife refuge with 13% effect are the most affected areas.
. A. Mirzajani, . S. Bagheri, . J. Sabkara, . M. Makaremi, . S. Khatib, . N. Nezamabadi, . A. Mirzajani, . A. Mirzajani, . F. Madadi,
Volume 10, Issue 4 (3-2022)
Abstract
Water hyacinth (Eichhornia crassipes) is native to the Amazon basin and is one of the worst aquatic weeds in the world. It has been an invasive species in aquatic ecosystems of northern Iran since 2011. The use of herbicides as a method of plant control is common and efforts are made to select a formulation with the least impact on the environment. In the current study, three types of herbicide including glyphosate (Roundup), Glufosinate-ammonium (Basta) and Bispyribac sodium (Nominee) were used to control water hyacinth and the effects of their use on the abundance and diversity of planktonic communities were investigated. Roundup treatment has an immediate effect on water hyacinth, while Basta and Nominee treatments were effective for a longer period of time. Results showed that about 90% of phytoplankton and 71% of zooplankton belonged to the diatom and protozoa, respectively. The diversity of plankton species did not change after herbicides application and the number of genera in control ponds was almost constant. The phytoplankton abundance was higher after herbicides applications, especially in the Roundup treatment. The used doses of herbicides not only had a controlling effect on water hyacinth but also had no significant negative effect on the diversity and abundance of planktonic communities.
