Cropland Dynamics and Their Influence on the Productivity in Northern Shaanxi, China, for the Past 20 Years: Based on Remotely Sensed Data
LIU Wenchao, LIU Jiyuan, YAN Changzhen, QIN Yuanwei, YAN Huimin
Journal of Resources and Ecology . 2014, (3): 272 -279 .  DOI: 10.5814/j.issn.1674-764x.2014.03.010