在对北京城区52个单位进行每木调查的基础上,概算了单位区绿化空间辐射占有量现状值与潜在值,分析了主要树种在绿量空间上的拓展潜力.概算结果表明:单位区的现状v值为6 371 409 m3,T值为2.44 m,仅有9.6％的单位区T值大于5m,而有44.2％的单位区T值不足1 m；潜在V值为18 986 896 m3,V值潜在增幅空间为现状值的2.98倍,有36.5％的单位v值潜在增幅在5倍以上.单位区80％以上的树种在理论上仍有2倍以上的绿量拓展潜力,其中,毛白杨、国槐、雪松、悬铃木等4个树种的潜在增量累计高达793万m3,占单位区树木潜在增量总和的62.8％,新植植株和部分未成龄植株是其绿量增长的主要来源.另外,事业单位(T=2.82 m)的整体空间绿最明显高于企业单位(T=1.45 m),其中学校(T=4.03 m)是事业单位中平均绿量最高的单位.立地环境差、重度修剪和建筑物阻挡是制约单位区空间绿量扩增的主要因素.%By investigating all trees in the areas of 52 enterprises and institutions in Beijing, the status and potential values of radiation occupation of green space (V) were calculated, and the potential V value of the main tree species were analyzed. Results show that the status V value was 6 371 409 m3 and the status T value was 2. 44 m. Only 9. 6% of the total areas had relative high T value which was more than 5 m, while more than 44% enterprise and institution areas were less than 1 m in T values. The potential V value was 18 986 896 m3. Which was 2. 98 times higher than that of the status. More than 36. 5% enterprise and institution areas had a great increase potential more than 5 times in V value. In theory, more than 80% of the arbors had more than two times the amount of development potential for V value. Among them, the potential V value of Populus alba, Sophora japonica, Cedrus deo-dara and Platanus hispanica accumulated up to 7. 93 million m3, which accounting for 62. 8% of the potential V value of the total trees. The potential V came mainly from part of the immature age plants and some new plants. On the space greening effect, the institutions(T=2. 82 m)) was significantly higher than enterprise areas(T= 1. 45 m), and school areas(T=4. 03 m)was the highest one in the space greening. Poor environment, severe pruning, and blocked by buildings were the major constraint factors on the amplification of green space.
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