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为了证明树体大小与根系的分布状态和地上部分与地下部分生长量的关系,我们利用苗圃地栽植树木进行试验。关于当年生长季结束以后的细根分布已经作了第一次报告,这次是第二年生长季结束以后,树高2米左右的4个树种,根系分布状态的第二次报告。调查方法供试树种是桂树、白桦、小三叶海棠、虾夷樱桃4种,1979年5月栽于北海道林业试验场苗圃地,第二年生长季结束以后进行了调查。首先,从各供试木树基20米(疑为2米——译者)的距离画成一个圆形,把土壤剖面分为0-15厘米,15-30厘米,30厘米以下三层。
In order to prove the relationship between the size of the tree and the distribution of the root system and the growth of the above-ground part and the underground part, we used trees planted in the nursery to carry out the experiment. The first report on the distribution of fine roots after the end of the growing season has been reported for the first time. This is the second report on the distribution of the root system after the end of the second growing season, with 4 tree species about 2 meters high. Method of investigation The test species were laurel, white birch, small trilobit, eucalyptus 4 species, in May 1979 planted in Hokkaido forestry test site nursery, the second year after the end of the growing season was investigated. First, draw a circle from the distance of 20 meters (2 meters - translator) for the test tree, dividing the soil profile into three layers of 0-15 cm, 15-30 cm and 30 cm.