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以采用常规林分调查方法，运用微机进行数据处理和程序运算，对Ⅰ－ ６９ 杨林分竞争密度效应进行了初步研究。结果表明，６ 年生以上，密度３５７ ～１ １１１ 株／ｈｍ２ ，郁闭度０－７ 以上的林分，竞争密度效应明显，平均单株立木材积与每公顷立木株数的幂乘式及倒数式回归方程有显著意义，且随林龄增加，竞争密度效应增大。幂乘式和倒数式的参数均随林龄增大而减小。幂乘式模拟精度高于倒数式，倒数式更适宜林龄较大的林分。
In order to study the effect of density on the I-69 poplar stand using the conventional forest surveying method, the data processing and the program operation were carried out by using the microcomputer. The results showed that the competitive density effect was obvious in the stand of 6 years old and above, with the density of 357-1 111 plants / hm2 and canopy density of 0-7 above. The power multiplication and reciprocal regression of average stand volume per hectare and stand number per hectare The equation has significant meaning, and with increasing age, competitive density effect increases. Power multiplication and reciprocal parameters decrease with increasing age. Power multiplication simulation accuracy is higher than the reciprocal, reciprocal is more suitable for older stands.