Hamidreza Abbasi; Mohammad Darvish
Volume 11, Issue 2 , August 2019, , Pages 163-178
Fatemeh Sharifani; Mohammad Jafari; Hossein Azarnivand; Hamid reza Abbasi; Mahshid Sori
Volume 13, Issue 4 , February 2007, , Pages 359-367
Abstract
This paper investigates the effects of plant growth on soil quality in Sagzi plain of Isfahan in order to evaluate the effects of agriculture on desertification processes in dry lands. Inappropriate crop management is the most effective factor which is related to soil and water ...
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This paper investigates the effects of plant growth on soil quality in Sagzi plain of Isfahan in order to evaluate the effects of agriculture on desertification processes in dry lands. Inappropriate crop management is the most effective factor which is related to soil and water salinization and this is one of the important processes of desertification. Is agriculture a positive or negative factor for reclamation of saline soils? To find an answer for this question, some improved and degraded factors of desertification in Sagzi plain of Isfahan were considered. Among those common agricultural products, which of them is more effective and which of them is less effective in soil reclamation? Treatments of Medicago, Wheat and Barley were selected and compared with derelict land that was independent variable in this experiment. In order to investigate the effects of those products, soils were considered that were allocated to cultivation of these products successively at least for 5 years. Then sampling was selected in every treatment with 5 reduplication, from the depth of 0-3, 30-60, 60-90, 90-120, 120-150 centimeter. The saline features and CaCo3, EC, OM,K+, Mg2+,Ca2+, Na+, Caso4, Cl-, SAR, HCo3-, So42- investigated in every treatments. Dunkan test was applied for comparison of soil features. The results of variance analysis showed that there is significant different between treatments in different depths. Dunkan is test showed that according to the overall scores for each factor, derelict lands are least decent treatment while Weat annual agro technical lands are the most suitable one. Then this is better that agricultural products that are appropriated with condition is cultivated.
Mohammad ali Meshkat; Mohammad reza Daneshvar; Mohammad reza Ekhtesasi; Kazem Dashtakian
Volume 13, Issue 1 , February 2006, , Pages 10-16
Abstract
Desertification is important for our country because it refer to land degradation in arid, semi-arid and arid sub - humid zones due to climatic and human agents. General and continuous study, local and exact investigation,and use of current quantitative models is necessary to better understanding of ...
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Desertification is important for our country because it refer to land degradation in arid, semi-arid and arid sub - humid zones due to climatic and human agents. General and continuous study, local and exact investigation,and use of current quantitative models is necessary to better understanding of land degradation process and desert development. In this research that is based on FAO/UNEP provisional methodology , some of the main desertification processes such as: vegetation destruction, wind erosion, and salinization were studied from two aspects:1) current status and 2) inherent risk. This area covers about 327700 hectars, extends to north of Yazd - Ardakan basin. Then, six maps were drawn for three processes and for two aspects which mentioned above, separately in 1:50000 scale, when the field observations and measurements were carried out. Finally two equal maps were provided by combination of six previous maps . Results of this investigation show that at the present time degrees of vegetation destruction, salinization, and wind erosion are ,, severe to very severe ,, ,,,medium to severe ,,, and,, slight to medium,, respectively . However, degrees of these processes from inherent risk aspect are ,, very severe ,, , ,, medium to severe,,, and,, medium to severe,, respectively. Although the FAO/UNEP methodology is the best model , however it has still some problems, such as: Non quantitative of some criteria; Non sensitivity of some indexes to slight changses ; Non measureable of some criteria; and Non equal the number of indexes in different processes.