Abstract: n order to investigate the effects of a new soil conditioner oyster shell powder on rice yield, soil acidification improvement and availability of heavy metals in paddy soil, the grain yield, soil pH, exchangeable hydrogen and aluminum, concentrations of soil total and available Cd, Pb contents were analyzed after the application of oyster shell powder with four addition rates in 2014. The results showed that the grain yield and soil pH were increased by 14.8%~22.9% and 0.18~0.33 units （4.0%~7.3%） after application of soil conditioner compared with the control. Moreover, the soil exchangeable hydrogen and aluminum were decreased by 19.6%~69.2% and 34.7%~93.9%, the soil available Cd and Pb contents were significantly decreased by 40.2%~49.0% and 29.9%~44.7% compared with the control. Therefore, oyster shell powder could increase the rice yield, improve soil acidification and reduce activity of heavy metals.

Key words: oyster shell powder, rice yield, soil acidification, heavy metals

摘要： 为探讨新型土壤调理剂牡蛎壳粉对水稻产量及其对土壤酸化改良和重金属钝化的效果，设置4种牡蛎壳粉用量的田间试验，分析了不同用量下水稻产量、土壤pH值、交换性氢和交换性铝的含量，以及土壤Cd、Pb全量和有效态的变化。结果表明，施用牡蛎壳粉的处理水稻产量为7 420.65~7 941.60 kg/hm2，比对照（不施）增产14.8%~22.9%；与对照相比，牡蛎壳粉将土壤pH值提高了0.18~0.33个单位（4.0%~7.3%），并使土壤交换性氢和交换性铝分别降低了19.6%~69.2%和34.7%~93.9%，土壤有效Cd下降了40.2%~49.0%，有效Pb下降了29.9%~44.7%。可见，使用牡蛎壳粉可以同时实现提高水稻单产、改良土壤酸化和阻控重金属活性的目标。

关键词: 牡蛎壳粉, 水稻, 土壤酸化, 重金属