青杨是青海省营造山地农田林网的主要树种。
Populus cathayana is the main species to plant farmland forest net work in Qinghai province hill .
古老的石桦是勘察加半岛上的主要树种，这些树具有不可思议的耐力。
The stone birch is the main tree of the Kamchatka Peninsula. These trees are unbelievably enduring.
本文对上海市郊防护林主要树种上的害虫种类进行了初步调查。
Investigation into important species of pest on the shelter trees in Shanghai area.
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