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造林密度对马尾松林分生长与效益的影响研究
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造林密度对马尾松林分生长与效益的影响研究
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Journal Article
造林密度对马尾松林分生长与效益的影响研究
2011
Overview
用21年生造林密度试验林的观测资料,分析了造林密度对林分生长和经济效益的影响。结果表明：（1）4种不同造林密度（A 1 667、B 3 333、C 5 000、D 6 667株.hm-2）对林分生长、林分结构均有显著影响,其中,林分胸径、单株材积、冠幅随密度增大而减小,高径比随密度增大而增大,但16年生后,林分胸径、单株材积、冠幅、高径比随林龄增长均表现出差异逐步缩小的规律;（2）林分蓄积与出材量在幼林期与密度呈正相关,进入中龄期后差异变小。21年生林分A、B、C、D各密度的出材量分别为300.13、309.94、303.19、313.32 m3.hm-2,随着密度增大,小径阶株数率及小径材出材量所占的比例增大;（3）净现值随着林龄的增大与密度的相关性由正相关转化为负相关性。随着密度增大,林分经济收获期提前。根据马尾松林分生长规律,综合出材量与效益核算,培育马尾松纸浆材与小径材宜采用造林密度2 200 3 300株.hm-2,培育大、中径材宜采用造林密度1 667 2 200株.hm-2。
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