Hanieh Safari; Hossein Arzani; Ali Tavili
Abstract
Overgrazing and inappropriate use of Taleghan rangelands has led to poor and very poor condition for almost all vegetation types. Taking the importance of rangelands in forage production and other benefits into consideration, management of these rangelands and improving their condition seems essential. ...
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Overgrazing and inappropriate use of Taleghan rangelands has led to poor and very poor condition for almost all vegetation types. Taking the importance of rangelands in forage production and other benefits into consideration, management of these rangelands and improving their condition seems essential. The present research was conducted using data integration of vegetation, condition, slope, soil, precipitation, etc. in a Geographic Information System (GIS) environment. Our study area was located in 50˚, 36َ, 43ً - 50˚, 53َ, 23ً longitude and 36˚, 5َ, 19 ً - 36˚, 19َ, 19ً latitude in the middle area of Taleghan watershed with the area of 37977 hectares. According to the results, improving methods and reforming activities could be suggested including prevention of livestock grazing (enclosure), sowing, inter seeding, broad casting and hoe sowing in areas which have poor and very poor condition (in 6621.325, 1274.381, 694.561, 1215.254 and 2368.101 hectares (areas), respectively). Such activities may improve livestock grazing management as well as watershed conditions, wildlife habitat or other similar purposes.
Nafise Panahi; amirhossein hamidian; Ali Tavili
Abstract
This study was conducted in Halgheh Darreh waste disposal site in Karaj in order to determine theconcentration of Ni and Pb in Halimocnemis pilifera and in region’s soil. Three 50*50 m plots inthe direction of the prevailing wind were selected. The First plot was close to the leachate pondsand ...
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This study was conducted in Halgheh Darreh waste disposal site in Karaj in order to determine theconcentration of Ni and Pb in Halimocnemis pilifera and in region’s soil. Three 50*50 m plots inthe direction of the prevailing wind were selected. The First plot was close to the leachate pondsand the next two plots were located at 500 and 1000 m from the first plot, respectively. Ten randomsamples from root and shoot of the plant and also from the soil were collected. The concentrationsof the metals were determined using a flame atomic absorption spectormetery (AA 240 (FS) VarianCompany, USA) after dry acid digestion. Two-way and one-way ANOVA were used to assess thedifferences of metal concentrations in roots and shoots of the plants, and in the soil of the plots,respectively. Duncan Test was applied to compare the average concentrations of metals in differentplots. The results revealed that the soil of the different plots do not have a significant difference inNi and Pb concentrations. No significant difference was observed between the metal concentrationsin roots and shoots of the plants. The plants in the second and third plots showed to have the highestconcentration of Pb (3.27 mg kg-1) and Ni (4.41 mg kg-1), respectively. Bioconcentration andtransmission factors for Ni and Pb (TF=1.21; 0.75 and BCF=1.11; 0.29, respectively) suggested thatH.pilifera is an appropriate plant to remove Pb and Ni from soil.
Sakine Saedi; Ali Akbar Mehrabi; Ali Tavili; Seideh Heydari
Abstract
Development impact assessment is key to achieving a comprehensive planning aligned with landsustainability. In human and natural systems studies, changes can be simultaneously examined intwo different systems. The purpose of this paper is to understand the effects of dam construction onland prices and ...
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Development impact assessment is key to achieving a comprehensive planning aligned with landsustainability. In human and natural systems studies, changes can be simultaneously examined intwo different systems. The purpose of this paper is to understand the effects of dam construction onland prices and land use change in nearby villages of Taleghan Dam. Descriptive - qualitativestatistics were used in this research and library and field methods were used for collecting therequired information. In order to specify the land value of the four villages of the area of the damfor four decaes, based on the prices of the year 1390, the land vlue formula was applied. Also, TMsatellite images of 1379 and 1386 were used for pinpointing land use changes. The results of thesestudies indicate that dam construction in 1380s and 1390s increased land price significantly andchanges in land price affected upon land use changes in nearby villages of dam and the price of landin the Zydasht village overlooking the dam increased dramatically.Based on the results of thisresearch, it can be stated that the dynamics of the land use of the area was affected by land pricethat for achieving sustainability in the watershed, an effective law must be enforced to prevent landdegradation and control land prices.