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要建立落叶松固定采种区,必须大量选择高产优树,但目前许多选优方法往往要等林分达到50—60龄或更大的年龄时才能适用,而且没有考虑到树木种子的产量和质量。
A large number of high-yielding trees must be selected to establish a fixed seed-setting area for larch production. However, at present, many preferred methods are often applied when the stand reaches 50-60 years of age or older and do not take into account the yield and quality of tree seeds .