impact of land use changes from rangeland to horti-agriculture on soil total carbon and particulate organic matter in micro- and macro aggregates (case study: salavatabad, sanandaj)

this study aimed to determine the effect of land use changes from rangeland to horti-agricultural lands on the most important qualitative characteristics of soil such as total soil carbon and particulate organic matter, in salavatabad region, sanandaj. in the present study, one rangeland, two cultivated pea lands, two cultivated wheat lands and two gardens were selected in growth season in the end of spring, 2014. forty two soil samples were taken randomly and systematically from the study region. then, soil micro- and macro aggregates were separated using 0.25 mm and 2 mm sieves. total soil carbon and particulate organic matter of soil samples were measured in the laboratory. the results showed that land use changes from rangeland to horti-agriculture significantly decreased total carbon and particulate organic matter in micro-aggregates. while total carbon and particulate organic matter in macro-aggregates was not changed by land use changes from rangeland to horticultural land. we suggested that if rangeland will be converted into agricultural land, horticultural land is the best for land use changes.