土壤污染源

稻田镉（Cd）污染日趋严重，已经成为限制水稻产量品质的土壤主要重金属的污染源之一，极大地影响了水稻安全生产及农业的可持续发展。

Cadmium pollution become more and more serious and already becomes one of main heavy metal pollution in soil limit rice yield and quality , Cd has enormously affected safe production of rice and the sustainable development of agriculture .

长期以来，石油类物质一直是水和土壤中的重要污染源。

Petroleum-series of Contaminants has been the important source of pollution in water and soil for a long time .

长期以来，油类物质（石油类物质和动植物油）一直是水和土壤中的重要污染源。

Since long ago , the oil matter which contains petroleum matter and animal and vegetable oil matter always are important source of pollution in the water and the soil .

若化学物质含量高于此值，说明土壤已受污染，应研究提出修复污染土壤与控制污染源的方案。

Beyond this value , the soil is contaminated and countermeasures should be undertaken to control the pollutant sources and remedy the contaminated soil .

土壤污染的面积不断扩大，并且这种扩大的态势还未得到有效的控制，同时土壤污染源的类型也呈现出多样性和复合型，加大了土壤污染防治的难度。

The expansion of the area of soil pollution , which has not yet been effectively controlled , and the diversity and complexity of soil pollution sources , make soil pollution prevention and control more difficult .