Mohammad khosroshahi | Tarbiat Modares University (original) (raw)

Papers by Mohammad khosroshahi

Zeitschrift für Geomorphologie, 2018

journal of watershed management research

Due to the limited water resources and low rainfall, finding proper solutions to reduce the water... more Due to the limited water resources and low rainfall, finding proper solutions to reduce the water consumption for vegetation production in natural areas has received attention more than ever before. For this purpose, this research was aimed to investigate the effects of superabsorbent polymer and Plantbac panels on the efficient use of water on Saxaul

Journal of Spatial Analysis Environmental hazarts, Sep 10, 2021

Journal of Rangeland Science, 2017

Negative impacts of gully erosion in marly areas are severe due to improper landuse practices suc... more Negative impacts of gully erosion in marly areas are severe due to improper landuse practices such as irrigation, tillage, overgrazing and degradation of vegetation cover. The objective of this research was to evaluate gully thresholds related to plant vegetation cover and landuse change in the Agriculture (AG), Fair Rangeland (FR) and Weak Rangeland (WR) areas of Ghaasr-e-Shirin, Kermanshah, Iran in 2015. The topographical parameters and vegetation cover were measured in the field. Furthermore, nine flumes were performed to determine the critical values of hydraulic parameter and sedimentation. Results revealed that cross-section, width, depth and gully branches length in the FR were significantly lower than those for AG and WR (p<0.05) affected by plant canopy and litter. The significant differences were found between three sits for soil organic carbon (SOC), electrical conductivity (EC) and hydraulic characteristics (inlet discharge, velocity, loaded sediment). Higher vegetati...

International Journal of Fundamental Physical Sciences, 2021

The first climatic factors affecting the phenomenon of dust and fine dust are collected, reconstr... more The first climatic factors affecting the phenomenon of dust and fine dust are collected, reconstructed, extended and completed in the form of DSI (Dust Storm Index) and Lancaster in Mehrabad meteorological station of Tehran was studied and analyzed. The results showed that in Mehrabad meteorological station in terms of temperature in 1992 the lowest value and in 1998, 2001, 2017 the highest value and in terms of humidity in 2017 the lowest amount of humidity and in 2000 the highest amount of humidity and in terms of rainfall in the year 2013 the lowest amount of precipitation and in 2019 the highest amount of precipitation and in terms of evaporation in 2009 the lowest amount of evaporation and in 1391 the highest amount of evaporation and finally in terms of number of dust days in 1998 the lowest number of days and in 2009 the highest number of days Dust has been recorded. Mehrabad station of Tehran in years showed DSI index, more than one number and Lancaster index, more than fift...

Satellite images and geographic information system (GIS) are important data resources for the dyn... more Satellite images and geographic information system (GIS) are important data resources for the dynamic analysis of landscape transformations. The application of these data made possible to monitor the changes in different land uses in less time, at low cost and with better accuracy. In this study, Lesu dna/ Land cover changes was investigated using of Remote Sensing and GIS in the south east of Zayanderood watershed. Multispectral satellite data acquired from images of Landsat satellite for the years 1998and 2013 was used. Processing operations was performed using ENVI4.7 software. Supervised classification-maximum likelihood algorithmwas appliedto detectland cover/land use changes observed in the study area. Studywatershed wasclassified into eight major land use classes viz., Vegetation, Agriculture, Gavkhouni Wetland, Settlement area, Sand dune, Salt land, Bare land and Poor pastureland. The results indicate that over 15 years, agriculture, poor pastures, vegetation and Gavkhouni w...

Real deserts as one of the most important biomes of biosphere, occupy nearly 7.5 percent of world... more Real deserts as one of the most important biomes of biosphere, occupy nearly 7.5 percent of world arid lands (UNDP, 1997). In order to determining geographical domain of real deserts for correct managing and sustainable development, we need to information about environmental factors that interactions between them resulted to desert condition. So, in this research which was carried out in 2000-2003, some of major earth sciences such as Geology, Geomorphology, Climatology, Hydrology, Pedology and Vegetation cover which are directly or indirectly affected on existing desert bioms, were studied. Then, considering fitness index for any of above subjects using standard tables, map of Khorasan deserts were drawn in six layers. Scale of base maps were 1/250000 that digitized in Geographical Information System (GIS) and were analyzed by Ilwis software. Individual analyzing of environmental factors indicated that climatic deserts contain the maximum area of Khorasn province (22100112 hectare)...

Iranian Journal of Watershed Management Science and Engineering, 2016

Environmental Health Engineering and Management, 2021

Background: Biological soil crusts (BSCs) that are able to produce sticky extracellular polymeric... more Background: Biological soil crusts (BSCs) that are able to produce sticky extracellular polymeric substances (EPS) play an important role in the formation of soil aggregates, thereby, reducing soil erosion. In this study, experiments were undertaken to identify biocrust species that produce EPS, in order to combat desertification in the Sejzi desert of Iran. Methods: A biocrust distribution map of Sejzi plain was prepared using Landsat 8 OLI images, then, various sampling points were selected. Some physicochemical parameters of samples from lichen-dominated and non-biocrusted areas were measured. The relationship between soil parameters and biocrusts presence was confirmed based on the Pearson’s correlation coefficient and principal component analysis (PCA) method. The type of chemical compounds in the soil content were determined via Fourier transform infrared spectroscopy (FTIR), including polysaccharides. To estimate the degradability of polysaccharides, each soil sample was plac...

Damghan Haj Aligholi Desert is about 2466 Km 2 , of which 813 Km 2 comprises the humid area (marg... more Damghan Haj Aligholi Desert is about 2466 Km 2 , of which 813 Km 2 comprises the humid area (margin). To investigate the fluctuations of groundwater level, 20 wells were drilled at the humid margin of south and southwest of desert. The changes in ground water level were measured at the beginning and half of each month in comparison to the constant level embedded at the edge of each well, and its hydrograph was depicted. According to the statistics taken from wells during April 2010 to September 2011 (15 months), fluctuations in water level compared to the initial level (water level in April 2010) were calculated for each month. Our results showed that the rate of water level fluctuation depended on the climate and topography of the region. The highest and the lowest water level of the wells were recorded from the second half of May to the first half of June and from December to mid-January, respectively. The type of vegetation surrounding each well was affected by the mentioned fluctuations in addition to the percentage of water minerals and the depth of groundwater level. Also, canopy cover percentage and density could be effective in increasing or decreasing the rate of groundwater evaporation. The groundwater is hyper saline with an EC of 18.9 to 274 ds/m and a pH of 6.7 to 8.4. The reduction of incoming waters to the desert due to the consecutive droughts and the prevention of runoff entering because of watershed management operations and dam construction have resulted in decline of groundwater level and it may cause many problems in the future.

Journal of Geography and Regional Planning, 2012

Environmental Monitoring and Assessment

Climate change is responsible for changes in the world’s vegetation. This study was aimed to inve... more Climate change is responsible for changes in the world’s vegetation. This study was aimed to investigate the effect of long-term variations in the air temperature, precipitation, and dust concentration on normalized difference vegetation index (NDVI) variations in the spring, summer, and growing season over arid regions of Iran. The results showed that the precipitation had a positive association with the NDVI in the spring and growing seasons (β > + 0.28; P < 0.05), while air temperature had a negative relationship with the NDVI changes in these seasons (β > − 0.34; P = 0.013). Our results also showed a negative relationship between the accumulated dust concentration (ADC) and NDVI in the spring (β = − 0.23; P = 0.09) and growing seasons (β = − 0.24; P = 0.003). Spatially, the strongest linkage between NDVI and climatic variables was observed in about two-thirds of the study region. In total, our findings indicate that the use of dust concentration, air temperature, and precipitation helps us to make a more accurate approach for evaluating the impacts of climate change on vegetation variations in the arid environments.

3 : IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH 2004; 11(3):275-286. IDENTIFICATION AND SEPARATI... more 3 : IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH 2004; 11(3):275-286. IDENTIFICATION AND SEPARATION OF GEOMORPHOLOGICAL DESERTS IN TEHRAN PROVINCE ATA POUR FARD A.,HOSSEINI MAJID ...

Ekológia (Bratislava)

Proper management of natural ecosystems is not possible without the knowledge of the health statu... more Proper management of natural ecosystems is not possible without the knowledge of the health status of its components. Vegetation, as the main component of the ecosystem, plays an important role in its health. One of the key determinants of vegetation health is its resilience in the face of environmental disorders. This research was conducted in parts of the Namakzar-e Khaf watershed in Northeast of South Khorasan Province with the aim of quantifying the vegetative resilience on behalf of the ecosystem health in response to long-term precipitation changes. First, the annual precipitation standardization was performed during a thirty-year period by the SPI method. Then, the average variation in TNDVI index obtained from the Landsat satellite images was examined and the resilience was tested by calculating the four effective factors (amplitude, malleability, damping and hysteresis). According to the results, the amplitude in the survey period was 6.04% and the vegetation has had differ...