TY - Biodiv Sci A1 - Guoke Chen, Keping Ma T1 - Criteria and methods for assessing the threat status of ecosystem Y1 - 2012-01-20 JF - Biodiversity Science JO - Biodiv Sci SP - 66 EP - 75 VL - 20 IS - 1 UR - https://www.biodiversity-science.net N1 - 10.3724/SP.J.1003.2012.10171 ER -