改良剂修复利用镉污染菜地土壤的田间效应研究

以株洲近郊区III类以上镉污染菜地土壤为研究对象，通过2茬小白菜的原位修复试验，分析常用改良剂的田间修复效果。结果表明，石灰、钙镁磷肥、有机肥3种改良剂对小白菜地上部分鲜重无抑制作用。与对照相比，石灰能显著提高土壤pH值，降低土壤DTPA-Cd和小白菜地上部分Cd含量，但对生物量无促进作用。钙镁磷肥和有机肥能将土壤pH值调控在适宜作物生长的范围，显著提高小白菜地上部分鲜重，但对地上部分Cd含量土壤DTPA有效态Cd含量没有明显地降低作用。综合来看，田间条件下石灰是较为理想的改良剂，施用量以不超过13 t/hm2为宜，但其后效还需进一步研究。

Study on the Improvement of Cd Contaminated Soil by Different Soil Amelioration Materials in Vegetable Field

A field experiment of Brassica chinensis,including two successive growing seasons,was conducted from September 2010 to December 2010 in Zhuzhou,in order to investigate effect of different soil amelioration materials on the remediation of Cd contaminated soil.The results showed that fresh weight of Brassica chinensis aboveground was no difference among three amelioration treatments.Compared to CK treatment,the soil pH increased significantly while DTPA-extracted Cd and the content of Cd of Brassica rapa aboveground reduced with lime treatment.The soil pH was suitable for growing for Brassica rapa with calcium magnesium phosphate and manure treatment,however DTPA-extracted Cd and the content of Cd of Brassica chinensis aboveground had no difference among calcium magnesium phosphate,manure and CK treatments.Together,under field conditions in lime was ideal improver,application amount to no more than 13 t/hm 2 was appropriate,but the subsequent effect needed further study.