pioneer tree species

例句：

1. 1. The pioneer tree species in the region have adapted to the changing climate conditions.
   该地区的先锋树种已经适应了气候变化。
2. 2.The pioneer tree species play a crucial role in maintaining biodiversity in the forest.
   先锋树种在森林中维护生物多样性中起着至关重要的作用。
3. 3. The pioneer tree species are often used as indicators of ecosystem health.
   先锋树种通常被用作生态系统健康状况的指示器。