Tree development especially in our old city areas is therefore difficult in the sense that few plantable sites are available , and where available they are often cramped and have poor conditions for vegetation growth 特别在旧区，合适的植树地点不多，即使有适合的地点，也是空间狭窄，不利植物生长。
2.
The rate and magnitude of urbanization in comparison to the capacity of the land to absorb the expansion can have bearing on the resultant urban morphology and hence the availability of plantable spaces 随著急剧的都市发展，城市的发展速度规模和潜在土地拓展空间对都市面貌及绿化区构成重大影向。完善的现代都市计划总会预留空间作种植之用。
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