introduction of exotic species
... intolerant tree species 喜光树种 introduction of exotic species 林木引种 ion nitriding 离子氮化 ...
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The outbreaks of these indigenous species occurred in conjunction with the introduction of sensitive exotic tree species species and ill-advised expansion over large areas.
这些重要林业害虫在我国的发生都是伴随着敏感外来树种的引进和大量不合理的种植而逐渐严重起来的。
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