Welcome to Chinese Agricultural Science Bulletin,
Effects of Long-term Fertilization on Enzyme Activities and Soil Fertility for Black Farmlands under Different Soil Matter Levels
陈文婷 付岩梅 隋跃宇 刘晓冰 李建维
Chinese Agricultural Science Bulletin . 2013, (15): 78 -83 .  DOI: 10.11924/j.issn.1000-6850.2013-0318