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对沙松人工林的调查发现 ,10年生沙松人工林即进入生长速期 ;2 4～ 2 6年生沙松人工林适宜密度为 2 0 0 0～ 2 2 0 0株 / hm2 ;沙松自然整枝能力差 ;30年生沙松人工林生长超过落叶松
According to the survey on the plantation of Pinus armandii, 10-year-old plantation of Pinus sylvestris came to the growth phase. The suitable density of plantation for Pinus sylvestris plantation from 2004 to 2006 was 20 000 to 2200 plants / hm2. Poor pruning ability; 30-year-old saffron plantation grew more than larch