Growth investigation and economic benefits analyzing on afforestation methods of Eucalyptus urophylla × E. grandis

The growths of 43-month-old Eucalyptus urophylla × E.grandis clone with 10 kinds of different planting measures and economic benefits were analyzed.The results showed that,there were significant differences on tree height,diameter at breast height,single tree volume and stand volume among treatments,the highest signal tree growth was Ⅲ-1 combination(planting density of 1 300 stems / hm2,fertilizing level of 3 650 g/stem),second one was Ⅳ-1 combination(planting density of 1 430 stems / hm2,fertilizing level of 4 700 g/stem) and Ⅴ-1 combination(planting density of 1 360 stems/hm2,fertilizing level of 4 700 g / stem).The largest stand accumulation was Ⅵ-2 combinations(planting density of 2 000 stems / hm2,fertilizing level of 4 700 g/stem),second one was Ⅴ-2 combinations(planting density of 2 330 stems/hm2,fertilizing level of 4 700 g / stem).From the point of economic benefits,the following three afforestation treatments such as Ⅲ-1,I(planting density of 1 200 stems / hm2,fertilizing level of 1 750 g/stem) and Ⅵ-1(planting density of 1 630 stems/hm2,fertilizing level of 3 650 g / stem) were better among the 10 treatments.Stands with Ⅲ-1,I and Ⅵ-1 treatments could produce net profits about 7 300,4 600,3 700 yuan / hm2,respectively.Other three afforestation treatments such as Ⅴ-2,Ⅴ1 and Ⅳ-2 could cause the plantation value below the cost.Most of all,the negative profit value of the Ⅳ-2 treatment could up to 9 800 yuan / hm2.

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