天然杨桦林密度效应的研究
兰士波
Management Density Effects of Poplar and Birch Natural Forests
LAN Shi-bo
南京林业大学学报(自然科学版) . 2007, (02): 83 -87 .  DOI: 10.3969/j.jssn.1000-2006.2007.02.019