Effects of planting years on functional diversity of carbon-metabolic microbial community in rhizosphere soils of alfalfa

• Meng-meng ZHANG, 
• Hong AO, 
• Jing-yun ZHANG, 
• Cheng-mei JU, 
• Ju-wei HU, 
• Xin
  LI, 
• Dun-jiang CAI, 
• Guang-yu SUN