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调查了北京市(不含郊区县)5条路段、7个单位和3类绿化地带,以代表北京绿化概况。用比较单位面积乔木数量(代表生物量)的简便方法,来评价其绿化的生态、经济效益。调查得出:一般路段乔木空缺率平均33.3%,特殊路段乔木空缺率高达98%以上;单位植树空缺率5%～40%,平均23.6%;两类绿化地带为稀树—草坪结构,乔灌木郁闭度仅0.3～0.4,而草坪盖度为0.8～0.9。由此看出绿化效益一般(良好),植树潜力较大。
Surveyed five sections of Beijing (excluding suburban counties), seven units and three types of greenbelts to represent the general situation of Beijing. The simple method of comparing the number of trees per unit area (representing biomass) is used to evaluate the ecological and economic benefits of its afforestation. The survey results showed that the average vacancy rate of arbor trees was 33.3% on average, and the vacancy rate of arbor trees was over 98% in special road sections. The vacancy rate of arbor trees was 5% ~ 40% with an average of 23.6% Canopy density is only 0.3 ~ 0.4, while the lawn coverage is 0.8 ~ 0.9. This shows that the general greening benefits (good), a greater potential for tree planting.