A Study of the Origin of Histosol Soils on the Coastal Lands in Nowshahr - Chalous Areas*

The Histosol soils have been one of the tweleve main categories of soil according to the U.S.A (N.R.C.S.U.S.D.A) soil taxonomy used much in agriculture and gardening due to their specific physical and chemical features. These soils have the concentration and dispersion in the east of Nowshahr, ranging from the Mazgah areas to Aliabad Asgarkhan. The composed model of these soils often followed the low coastal lands model. The strong tectonic of this area, the advances of the sea, and the construction of coastal dam, the concentrated plant coverage and the high stability have been the main conditions for the formation of these soils in the area. The Histosol soils of the area with an average thickness of about 2 meters have a volume of about 20 millions m3, and 6% of the total coastal areas of Nowshahr and Chalous consist of these soils. The component parts of these soils in the area mainly result from the analysis of the remainders of Alnus Glutinosa, Canes and Cartex. The Histosol soils of the area are the Hemist suborder in categorization.