EN中文
Temporal and spatial variations of soil organic and total nitrogen in the Songnen Plain maize belt
ZHANG Chun-hua, WANG Zong-ming, REN Chun-ying, ZHANG Bai, SONG Kai-shan, LIU Dian-wei
GEOGRAPHICAL RESEARCH . 2011, (2): 256 -268 .  DOI: 10.11821/yj2011020006