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低产林改造,在次生林抚育生产中占有一定的比重。为探讨改造方式对造林树种的影响,我们于一九八四年九月末,在生境条件、造林措施相同的带状皆伐,块状采伐,郁闭度保留0.2三种改造方式的固定标准地中,对营造的红松、紫椴混交林幼苗的树高生长量进行了调查。结果见表1。从表1看出,在三种改造方式(A、B、C)中,紫椴以A种改造方式生长最好。平均高增长分别比C、B提高20.95%和16.02%;
Low-yield forest transformation, in secondary forest tending to produce a certain proportion. In order to explore the impact of rebuilding methods on afforestation species, at the end of September 1984, at the end of September 1984, in the habitat conditions, afforestation with the same banded clear cutting, block cutting, canopy retention 0.2 fixed standards of three transformation methods , The tree height growth of mixed Korean pine and Tilia amurensis seedlings was investigated. The results are shown in Table 1. As can be seen from Table 1, Tilia has the best growth in the A transformation mode among the three transformation modes (A, B, C). The average high growth is respectively 20.95% and 16.02% higher than that of C and B;