The accumulation of active ingredients of Polygonatum cyrtonema Hua is associated with soil characteristics and bacterial community oleh Qingyou Zhang, Qingyou Zhang, Yunzhang Cai, Yunzhang Cai, Luping Zhang, Luping Zhang, Mei Lu, Mei Lu, Luyun Yang, Luyun Yang, Dekai Wang, Qiaojun Jia, Qiaojun Jia