TITLE:
The Effect of Clay Content and Land Use on Dispersion Ratio at Different Locations in Sulaimani Governorate—Kurdistan Region—Iraq
AUTHORS:
Saman M. K. Rasheed
KEYWORDS:
Particle Size Distribution, Dispersion Ratio, Bulk Density, Organic Matter
JOURNAL NAME:
Open Journal of Soil Science,
Vol.6 No.1,
January
20,
2016
ABSTRACT: Land use changes
from natural ecosystems into managed ecosystems resulted in negative impact on soil
structure and quality. The purpose of this study was to determine the influences
of different land-use types on physical and chemical properties of soils in Sulaimani
governorate. Land use systems including natural forest, pastureland and agriculture
were identified. Ten of soil samples were collected from the 0 - 30 cm depth, and
some soil physical and chemical properties of soil were determined. The land use
alters from forest to agriculture resulting in significant decrease in organic matter,
calcium carbonate and soil surface area and with this change, dispersion ratio affected
on the physical property. The value of DR was highest in the Zrguezi Gawra
cultivated with Cucumber and the lowest value in Dukan is 13%, and correlation coefficient
between dispersion DR with sand, silt and bulk density is positive, value
is (0.4979, 0.0126 and 0.7536) respectively, and with clay and specific surface
area (SSA) the correlation coefficient value is (-0.7281 and -0.4466).