引黄灌区不同种植年限紫花苜蓿土壤养分与细菌群落特征研究
, 刘秉儒, 牛宋芳 Correlation between soil nutrient status and the bacterial community composition in alfalfa stands of different ages in the Yellow River irrigation area
ZHANG Wen-wen, LIU Bing-ru* , NIU Song-fang
, LIU Bing-ru, NIU Song-fang 