1、The soil in this region is predominantly noncalcareous, which is why it is not suitable for growing certain types of plants.

这个地区的土壤主要是非含碳酸盐的，所以不适合种植某些植物。

2、The formation of noncalcareous sediments requires specific environmental conditions.

非含碳酸盐沉积物的形成需要特定的环境条件。