根据标准地和解析木调查资料，以樟子松人工林树冠内活枝为研究对象，探讨同一树木的不同龄阶的枝生长规律，同一林分不同大小树木枝生长的规律，以及不同林分条件下枝生长的规律。结果表明：单株树木枝条长度总生长曲线呈“S”形，连年生长在生长初期达到一最大值后随年龄的增加而逐渐减小；在同一林分中，枝条总生长随着枝龄的增加而持续增长；在不同年龄相同密度林分中，年龄较小的林分枝长连年生长要比年龄较大的树林增长快一些；在相同年龄不同密度林分中，密度较小的林分比密度较大的林分枝长总生长及同期连年生长要快一些。%According to survey data of sample plot and analytic trees, taking living branchs in tree crown of Pinus sylvestris var. mongolica plantation as researching objects, branch growth of same tree with different ages, different size in same stand and in different stand were discussed. Result shows that ： growth curve of branch length for individual tree shows ＂S＂ shape ; current annual growth decrease with the increase of the tree age after reaching a maximum value ; in the same stand, total growth of branch increase gradually with the increase of branch age ;in the stands with the same density ＆ different ages, current annual growth of younger stand increase faster than that of older stand ;in the stands with the same age ＆ different densities, total growth of branch ＆ current growth at the same stage for stand with smaller density are faster than that with bigger density.
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