在莫斯科州谢列勃良尔斯基试验施业区所进行的簇式造林试验很有成效。现把15年生松林簇式造林(一平方米小面积上)不同栽植密度的保存率指标列于表1。栽植密度大时,单位面积上平均保存株数虽然有所增加,但保存率却显著下降。不同密度的生长落后 Clustered afforestation trials in the Shalwar Bolshaya pilot plantations in Moscow state have been fruitful. The 15-year-old pine forest cluster (small area of ​​one square meter) different planting density storage rate indicators are shown in Table 1. When the planting density is large, the average preservation number per unit area though increased, but the preservation rate decreased significantly. Different density of the growth of backward