燕山山地次生阔叶林主要树种的生态位特征

佟欣

Niche characteristics of the major trees in secondary broad-leaved forest in Yanshan Mountain

TONG Xin

河北农业大学学报 . 2016, (6): 83 -87 . DOI: 10.13320/j.cnki.jauh.2016.0138