Volume 77 (2024)
Volume 76 (2023)
Volume 75 (2022)
Volume 74 (2021)
Volume 73 (2020)
Volume 72 (2019)
Volume 71 (2018)
Volume 70 (2017)
Volume 69 (2016)
Volume 68 (2015)
Volume 67 (2014)
Volume 65 (2012)
Volume 63 (2010)
Volume 62 (2009)
Study on the effect of soil chemical characteristics and crown canopy of Ziziphus spina-christi L. on soil seed bank characteristics

Moharram Ashrafzadeh; Reza Erfanzadeh

Volume 66, Issue 4 , March 2014, Pages 477-491


  This study was carried out to investigate the effect of crown canopy of Ziziphus spina-christi on seed bank characteristics (density and similarity with above ground flora) in two sites with saline-alkaline and alkaline soils. In each soil, forty plots were established, half in and half outside of Z. ...  Read More

Comparison of stochastic models and conceptual models in hydrological drought forecast (case study: Karkheh River Basin)

Ommolbanin Bazrafshan; Ali Salajegheh; Ahmad Fatehi; Abolghasem Mahdavi; Javad Bazrafshan; Somayeh Hejabi

Volume 66, Issue 4 , March 2014, Pages 493-508


  Drought is random and nonlinear phenomenon and using linear stochastic models, nonlinear artificial neural network and hybrid models is advantaged for drought forecasting. This paper presents the performances of autoregressive integrated moving average (ARIMA), Direct multi-step neural network (DMSNN), ...  Read More

Comparison of Geostatistical methods for prediction of soil parameter in plant community of Nitraria schoberi(arid regions)

Hamid Toranjzar; Asghar Zare Chahouki

Volume 66, Issue 4 , March 2014, Pages 509-519


  Geostatistical approaches have great importance because they include spatial correlation of geographic data. Present study evaluated the efficiency of geostatistical techniques and demonstrated their capabilities in studying the soil variables(soil texture (sand percent), EC and So4-2) in the important ...  Read More

Application of the Genetic Algorithm technique for optimization of the Hydrologic Tank and SIMHHYD Models’ Parameters

Hamed Rouhani; Mohsen Farahi Moghadam

Volume 66, Issue 4 , March 2014, Pages 521-533


  In the past decades, much effort has been devoted to simulation of the rainfall-runoff process. Hydrological models are simplified representations of the natural hydrologic system. In each case, the choice of the model to be applied depends mainly on the objective of the modeling but also on the available ...  Read More

Compare of Changes diversity and richnes of plant species and plant forms in three utilization sites (Case study: southern slopes of Damavand mountain Summer Rangeland)

Ghodrat Alah Heydari; Hamid Reza Saeidi Goraghani

Volume 66, Issue 4 , March 2014, Pages 535-547


  Assessment of diversity and species richness in the understanding of ecosystem functions, protect and preserve genetic resources, evaluation and control of environmental change and the success or failure will help natural resource management programs. Arbitrary banning livestock grazing program and one ...  Read More

Study of grazing behaviour of hybrid cows in the rangeland of Tezkharab

Mohammad Fayaz; Hossein Piry Sahragard; Hassan Yeganeh; Anvar Soor; Mirtaher Ghaemi

Volume 66, Issue 4 , March 2014, Pages 549-563


  Having a comprehensive and correct understanding of grazing behaviour of livestock helps to maximize livestock products. Moreover, a good understanding of livestock behavior allows us to predict the effects of livestock on rangeland and finally we can do livestock grazing management the best possible. ...  Read More

Modification of Reconnaissance Drought Index (RDI) based on the best method of evapotranspiration estimation and probability distribution function

محمد قبایی سوق; Abolfazl Mosaedi

Volume 66, Issue 4 , March 2014, Pages 565-582


  Reconnaissance Drought Index (RDI) is based on fitting a Log-normal distribution to the ratio of precipitation to evapotranspiration (ETo) values in selected periods. In this index value of ETo were calculated based on mean temperature by Thorenth-Waite (Th) method. Th method, may underestimated ETo ...  Read More

The effect of grazing on density, diversity and richness of soil seed bank in mountainous rangelands (case study: Waz watershed, Mazanderan province)

Paria Kamali; Reza Erfanzadeh; Hasan Ghelichnia

Volume 66, Issue 4 , March 2014, Pages 583-593


  This study aimed to investigate the effect of animal grazing on soil seed bank characteristics in the northern slopes of Alborz. For this purpose, soil seed bank characteristics were compared between grazed and ungrazed areas. Therefore, four transects perpendicular to the sides of exclosure inside and ...  Read More

Suitability Determination for Sheep in Rangeland of Ferydounshahr, Isfahan

Ebrahim Gavili; Mohamad Reza Vahabi; Fazel Amiri; Hossain Arzani

Volume 66, Issue 4 , March 2014, Pages 595-607


  This research was conducted to recognize Sibak-Sardab watershed rangeland potentials, evaluate and determine of suitability classes for sheep grazing. In this research, we used the proposed method of FAO (1992) and for information layers crossing used in Geographical Information System (GIS). In this ...  Read More

Estimating Topsoil Salinity from LANDST Data: A Comparison between Classic and Spatial Statistics

Ali Akbar Noroozi; Mahdi Homaee; Abbas Farshad

Volume 66, Issue 4 , March 2014, Pages 609-620


  Soil salinity is a limiting factor for plant growth and a serious cause of land degradation. Field sampling and statistical analysis for estimating soil salinity is expensive and time consuming. Estimating soil salinity by spatial statistical models and Geographic Information System (GIS) is recommended, ...  Read More

Monitoring the Effects of Precipitation on Vegetation Cover Changes Using Remote Sensing Techniques in 12 Years Period (Case study: Semirom Isfahan)

Fatemeh Hadian; Reza Jafari; Hossein Bashari; Saeed Soltani

Volume 66, Issue 4 , March 2014, Pages 621-632


  Because soil moisture condition affects vegetation changes hence, monitoring of drought and vegetation changes are among valuable management tools in these ecosystems. Nowadays, satellite images are used as a low-cost and fast method for vegetation study in different scales. Vegetation change is assessed ...  Read More

Determining an appropriate combination of geochemical elements to investigate the relative importance of lithological units in sediment production of Khor-Sefidarak Basin

Sadat Feiznia; Soheila Youneszadeh Jalili; Hasan Ahmadi

Volume 66, Issue 4 , March 2014, Pages 633-646


  Due to difficulties in the application of traditional methods for identifying sediment sources, fingerprinting techniques, based on physical, chemical and organic properties of sediment and source materials, are increasingly being used as a valuable and effective alternative approach to obtain such information. ...  Read More