Impact of land-use change on soil properties in a typical karst agricultural region of Southwest China: a case study of Xiaojiang watershed, Yunnan. - Yong-Jun Jiang; Dao-Xian Yuan; Cheng Zhang; Ming-Sheng Kuang; Jian-Li Wang; Shi-You Xie; Lin-Li Li; Gui Zhang; Rao-Sheng He (Environmental Geology, 2006)