【摘要】 为探索适合镉(Cd)污染农田的种植模式，在浏阳市蕉溪镇某中度污染农田(pH为5.73,Cd总含量为0.86 mg/kg)开展大田试验，分析亚麻—水稻水旱轮作模式对Cd的累积能力和对农田土壤Cd污染的修复效率。结果表明，亚麻对Cd具有较强的富集能力，其叶片Cd含量最高，为7.77 mg/kg,富集系数(BCF)达9.83;果壳与籽粒的镉含量均在3.00 mg/kg以上，对应的BCF值分别为4.18和3.86。一季亚麻的总生物量为16 950.50 kg/hm~2,可提取Cd 74.28 g/hm~2,修复效率为3.84%。与前茬未种亚麻的对照相比，轮作模式下水稻各部位尤其是糙米对Cd的累积呈现明显下降的趋势。后茬水稻收获后，稻草离田，亚麻—水稻轮作模式每年可从土壤中提取Cd达128.26 g/hm~2,修复效率可达到6.63%。更多还原

【Abstract】 In order to explore a suitable planting mode for cadmium(Cd)polluted farmland, a field experiment was carried out in a moderately polluted farmland(pH 5.73,total content of Cd was 0.86 mg/kg)in Jiaoxi Town, Liuyang City, Changsha City, to analyze the Cd accumulation capacity and Cd remediation efficiency of flax-rice rotation mode. The results showed that flax had a strong enrichment ability for Cd, with the highest content of Cd in leaves(7.77 mg/kg)and enrichment coefficient of 9.83.The cadmium content of fruits(including shells and seeds)was above 3.00 mg/kg, and the corresponding BCF value was 3.86.The total biomass of one season flax was 16 950.50 kg/hm~2,and the amount of Cd could be extracted was 74.28 g/hm~2,and the repair efficiency was 3.84%.Compared with CK without flax, Cd accumulation in di-fferent parts of rice, especially brown rice, decreased significantly under rotation mode. After the latter rice was harvested, rice straw was removed from the field, and Cd extracted from the soil in flax-rice rotation mode was up to 128.26 g/hm~2,with a remediation efficiency of 6.63%.更多还原