indicator plant of soil

例句：

1. 1. The presence of this indicator plant is crucial for understanding the health of the soil.
   这种指示植物的存在对于理解土壤的健康至关重要。
2. 2.The researcher found that this indicator plant could be used to monitor soil quality.
   研究人员发现，这种指示植物可以用来监测土壤质量。
3. 3.In some regions, farmers use this indicator plant as a way to determine when to plant crops.
   在一些地区，农民使用这种指示植物作为决定何时种植作物的方法。