soil improving tree species

例句：

1. 1. These trees are known for their ability to improve soil quality.
   这些树木因能改善土壤质量而闻名。
2. 2. The forestry department is working on developing more soil-improving tree species.
   林业部门正在努力开发更多的土壤改良树种。
3. 3.The planting of these trees is crucial for maintaining the health of our soil.
   种植这些树木对于保持我们土壤的健康至关重要。