Beijing university of civil engineering and architecture library, Beijing 100044,China;
Key Laboratory for Silviculture and Conservation of Ministry of Education, Forest College, Beijing Forestry University, Beijing 100083, China;
Nature conservation College, Beijing Forestry University, Beijing 100083, China;
National and Local Joint Engineering Laboratory of Wetland and Ecological Conservation, Heilongjiang Academy of sciences-Institute of Nature and Ecology, Harbin 150040, China;
Key Laboratory for Silviculture and Conservation of Ministry of Education, Forest College, Beijing Forestry University, Beijing 100083, China;