加强种苗基地建设，搞好苗木供应；
Strengthens the seedling base construction, does well the nursery stock supply;
因此必须要有一定数量、规模，布局与结构合理的城市生产绿地作为生产、供应苗木的基地。
Therefore, certain amounts of garden nursery with reasonable structure is needed to be the supply base of garden plants.
而在光照和水分供应充足的条件下，榉树的苗木高、地径平均生长量是庇荫、水分供应相对少的2.8倍。
The height and basal diameter growth with sufficient light and water supply was 2.8 times of seedlings under shady conditions and with insufficient water.
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