All these trials are now kept as gene banks.Eucalyptus is a kind of exotic plants, with no natural distribution in China and it is impossible for Eucalyptus to hybrid with the native trees.

• 桉属树种全部为外来引进树种，我国没有自然分布，不能与我国本土树种发生杂交，不存在与我国本地树种发生基因交流或杂种化的风险。