Effect of altitude on the phosphorus contents of soil and plant litter deposits in a Wugong Mountain meadow

• Qian Liu, 
• Xiang Zheng, 
• Bang-liang Deng, 
• Li-ya Zheng, 
• Li-jun Huang, 
• Shu-li Wang, 
• Ling Zhang, 
• Xiao-min Guo