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油松人工林中林木叶的元素含量及其年度和季节的变化
翟明普 夏祖延 曹玉英
THE ELEMENT CONTENT AND ITS ANNUAL VARIATION AND SEASONAL VARIATION IN TREE LEAVES OF PINUS T ABUL AEFORMIS PLANTATION
Zhai Mingpu;Xia Zuyan;Cao Yuying
林业科学 . 1987, (3): 286 -298 .