Department of Water and Soil Engineering,Faculty of Agriculture,Ilam University,Ilam 6939177111,Iran;
Department of Range and Watershed Management,Faculty of Natural Resource and Earth Science,Shahrekord University,Shahrekord 8818634141,Iran;
Department of Forestry,Faculty of Agriculture,Ilam University,Ilam 6939177111,Iran;
US Forest Service,Northern Research Station,Columbia,OM 65211,USA;
arid ecosystem; carbon sequestration; degraded soil; restoration; reforestation; soil management;