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过度修枝对油松生长及其抗虫性影响以及合理修枝探讨
周章义 李景辉
THE EFFECT OF OVER-PRUNING ON PINUS TABULAEFORMIS GROWTH AND ITS RESISTANCE TO DENDROLIMUS,AND ITS RESONABLE PRUNING
Zhou Zhangyi;Li Jinghui
林业科学 . 1993, (5): 408 -414 .