With the rapid development of urban construction, the urban afforestation is on a higher level, which results in more seriousness of pollen allergy pollution.
随着城市建设的迅猛发展，城市绿化水平也不断提高，但这带来了花粉污染与过敏现象的日益严重。
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In southern China, 37% of land degradation caused by deforestation, 35% by slopeland reclamation, 18% by improper afforestation, and 10% by industrial, mining and transportation construction.
The nursery is the important component in the construction of city afforestation, Seedling is the goods and materials foundation of construction of afforestation.