Effects of different grassland utilization patterns on plant and soil characteristics in the Bashang area of northern Hebei Province

• LI Yuwen, 
• ZHU Zhanjun, 
• WANG Yuqing, 
• GAO Yunchang, 
• MA Zengwang, 
• LI Yuling, 
• LIU Yuhua, 
• LI Xiaogang