TY - JOUR ID - 24347 TI - An Investigation of Changes in Fractional Size and Chemistry of Soil Organic Matter JO - Iranian Journal of Soil and Water Research JA - IJSWR LA - en SN - 2008-479X AU - Oosat, Maryam AU - Haidari, Ahmad AU - Sarmadian, Fereydoon AD - Y1 - 2013 PY - 2013 VL - 42 IS - 2 SP - 191 EP - 198 KW - Chemical fractionation KW - Clay mineralogy KW - Fulvic acid KW - Humic Acid KW - physical fractionation DO - 10.22059/ijswr.2012.24347 N2 - Soil organic matter is an indicator of soil, agriculture and environmental quality, playing important roles in soil strength and sound environmental functions. Size and chemical fractionation of soil organic matter are long-standing approaches in clarifying their key role in soil processes. Twenty seven surface samples (0-20 cm) and 6 pedons from different landform units were sampled and described according to USDA, 2002 and by means of illustrating the surface as well as vertical distribution of different size and varied chemical fractions of organic carbon. Physico-chemical, mineralogical, physical and chemical fractionations were carried out following standard methods. The results revealed that organic carbon content increases by decrease in the fraction size, reaching its maximum at UR - https://ijswr.ut.ac.ir/article_24347.html L1 - https://ijswr.ut.ac.ir/article_24347_05eb9463f5975baf04843e43a5b0ed2f.pdf ER -