微污染水灌溉对土壤-作物系统Cd动态的影响及小麦敏感期分析

为了探讨重金属在土壤-作物系统中的动态平衡以及作物对重金属吸收的敏感期，通过田间小区试验进行不同浓度Cd微污染水灌溉，分析Cd在土壤-作物系统中的含量及其随生育期变化的情况。结果表明：与清水相比，含Cd微污染水灌溉显著性增加冬小麦表层0~10 cm土壤Cd含量，冬小麦地上部分带走量远小于灌溉输入量，影响土壤Cd平衡；灌浆期是冬小麦吸收Cd的敏感期，不适宜微污染水灌溉；含Cd微污染水灌溉降低冬小麦籽粒的饱满度，显著降低冬小麦的产量。总之，含Cd微污染水灌溉尤其在灌浆期显著性影响土壤-作物系统Cd平衡。

Analysis of Cd Dynamic of Soil-crop System and Sensitive Period of Winter Wheat with Micro-polluted Water Irrigation

In order to explore the dynamic balance of heavy metals in the soil-crop system and the sensitive period of heavy metal uptake, field plot test was conducted with micro-polluted water of different concentrations of Cd. The results showed that, compared with the treatment of clear water, the Cd content of 0-10 cm soil layer significantly increased under micro-polluted water irrigation treatment. The take away Cd content of the aboveground part was far less than the irrigation input Cd content, which affected the balance of the soil Cd. The filling stage was the sensitive period of winter wheat and not suitable for micro-polluted water irrigation. The winter wheat grain plumpness was reduced with micro-polluted water irrigation, and the yield of the winter wheat was significantly reduced. In conclusion, Cd micro-polluted water irrigation could influence Cd balance in soil-crop system, especially in the filling period.