SUN Wen-yi, GUO Sheng-Li, SONG Xiao-yan . Effects of topographies and land use on spatial distribution of surface soil organic carbon in hilly region of Loess Plateau[J]. JOURNAL OF NATURAL RESOURCES, 2010 , 25(3) : 443 -453 . DOI: 10.11849/zrzyxb.2010.03.010