Ecological cost of grain production in gully area of Loess Plateau.
LI Xiao1, XIE Yong-sheng1,2, ZHANG Ying-long1, LI Wen-zhuo1
1College of Resources and Environment, Northwest A &|F University, Yangling 712100, Shaanxi, China;2Institute of Soil and Water Conservation, Chinese Academy of Sciences/Ministry of Water Resources, Yangling 712100, Shaanxi, China