EN中文
Emergy Analysis of Agroecosystem Productivity of Typical Valley in Loess Hilly-gully Region of the Loess Plateau: A Case Study in Zhifanggou Valley of Ansai County
DONG Xiaobin, GAO Wangsheng, YAN Maochao
Acta Geographica Sinica . 2004, (2): 223 -229 .  DOI: 10.11821/xb200402008