但是，由于我国幅员辽阔，地质情况复杂，拥有大量的软土区。
However, due to the vast, complex geological conditions, with large areas of soft soil.
结果表明，紫色土区已存在重金属污染问题，尤以矿区和大城市近郊最为明显。
The result showed that the heavy metal pollution have existed in purple soil area, and it was most obviously at the mining areas and big city suburbs.
黑龙江省西部松嫩平原为大面积高钠盐渍土区，区域内的土质大都为分散性粘土。
There is large area of high Na salty soil at Songnen Plain in the west of Heilongjiang.
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