Abolfazl Rahmati Zadeh; Mostafa Jafari; Mostafa Karimian Eghbal
Volume 21, Issue 4 , March 2015, , Pages 580-590
Abstract
Identifying the border of saline lands is the first step to deal with the problem of salinity in these regions. This research was aimed to investigate the relationship between edaphic, climatic and vegetative factors in each habitat and its extension to other similar areas. In the current research, the ...
Read More
Identifying the border of saline lands is the first step to deal with the problem of salinity in these regions. This research was aimed to investigate the relationship between edaphic, climatic and vegetative factors in each habitat and its extension to other similar areas. In the current research, the vegetation types were detected by Landsat satellite images. For this purpose, a soil profile was dug in each vegetation type and where water was found, samples were analyzed. In addition, a number of soil profiles were dug in areas without vegetation. Results showed that half of the studied vegetation types grew on saline soils and the other half grew on non-saline soils. The soil of the study area was classified as saline and alkaline soils. Seidlitzia sp. and Aeluropus sp. were identified as the most and least resistant halophytes, respectively. Geological formations containing evaporite deposits (Neogen), Qom formation deposits, little precipitation, Qom salt dome, saline water flowing in the region and geomorphological position were the factors increasing the salinity of the study area.
Mohammad ali Meshkat; Mohammad hadi Rad; Seyed Reza Hoseini
Volume 14, Issue 4 , February 2008, , Pages 447-454
Abstract
Higher evaporation compared to precipitation in arid zones causes upward movement of soil water and consequently salts will be accumulated in root zone. Since Salt moves with water flow, salt distribution will fallow a pattern similar to soil water distribution. The amount of applied water or leaching ...
Read More
Higher evaporation compared to precipitation in arid zones causes upward movement of soil water and consequently salts will be accumulated in root zone. Since Salt moves with water flow, salt distribution will fallow a pattern similar to soil water distribution. The amount of applied water or leaching fraction is one of the most important and effective factors on salt movement and distribution in soil. This research was established at Yazd Desert Research Station in weighting lysimeters. Salt profile in soils of three hrrhgation treatments : FC, 1/3 FC and no irrigation were plotted and compared with each others for three times (t1 , t2 and t3) in this research. In addition soil moisture was also controlled in different ways. The experhment was done in a completely randomized design and Duncan's test was used for comparison of means. Results indicated that soil salinity increased from top soil to deeper layers and this feauture was more significant in fully irrigated treatments specially at the latest times (t2 and t3). Total accumulated salt was also more at more irrigated treatments. High salinity of water and inadequate of leaching ,were the most important factors which led to salt accumulation in the deep layers of fully irrigated lysimeters.