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马尾松幼林往往因打枝过早或过度打枝而使生势变慢,甚至严重影响其成长。因为打枝后减少了植株正常生长的针叶,缩小了同化面积,违反生长发育的自然规律。我们对标准株进行测定的结果,不打枝的冠长4.25米,占树干总长的60%,冠幅2.6米,枝轮9层,主枝68条,针叶表面积22.87平方米;打枝的冠长2.26—3.23米,占树干总长的39.6—55.4%,冠幅2.04—2.23米,枝轮6—7层,主枝22条,针叶表面积9.01—15.13平方米。可见不打枝的立木冠长冠大,
Young masson pine trees tend to slow or even slow their growth due to premature or excessive branching. Because after the pruning reduced the normal growth of plant needles, reducing the area of assimilation, in violation of the natural law of growth and development. We measured the results of the standard strains, not the crown length 4.25 meters, accounting for 60% of the total length of the trunk, crown 2.6 meters, 9 branches, main branch 68, the surface area of 22.87 square meters coniferous; The crown length 2.26-3.23 meters, accounting for 39.6-55.4% of the total length of the trunk, crown 2.04-2.23 meters, branches 6-7 layers, the main branch of 22, coniferous surface area of 9.01-15.13 square meters. Can not be seen standing wood crown long crown,