研究隔沟灌溉下芥菜生物量及重金属富集与转移特性,对土壤重金属污染植物修复具有重要作用.试验于2014年3月-2015年11月实施,设置灌水频率(I3、I4、I5分别为灌水3、4、5次,灌溉总量为0.15m)及追肥频率(基肥0.74 g/m3,施肥总量1.3 g/m3,追肥次数F0、F1、F2、F3、F4)2因素处理,结果表明在灌溉频率影响下,芥菜叶片的超氧化歧化酶活性、脯氨酸随灌水频率增加而呈增长,丙二醛呈下降趋势.生物量、镉质量比、镉富集系数、镉累积总量I4比I3分别提高12.33％ ～ 89.71％、5.00％～44.33％、0.50％ ～ 55.36％、22.22％ ～ 114.81％;I5比I3提高19.21％ ～ 87.37％、24.00％ ～93.51％、13.44％ ～ 112.30％、77.42％ ～ 168.75％.其中地上部生物量增幅大于根部,镉质量比、镉富集系数和镉累积总量增幅则根部大于地上部.在施肥频率影响下生物量、镉质量比、镉富集系数和镉累积总量,高频施肥(F4)比低频施肥(F1)分别增长22.55％ ～99.71％、30.68％～87.40％、37.80％～112.20％、71.43％ ～213.51％,且低频灌溉情况下根部增幅大于地上部,中、高频率灌溉下地上部大于根部.另外转移系数随水肥供应频率增加略有下降,但整体维持较高水平.通过模型模拟与验证,表明年际间芥菜重金属修复能力对水肥供应频率响应趋于一致.%Mustard biomass and heavy metal enrichment and transfer characteristic under the separate furrow irrigation was studied,which plays an important role in the phytoremediation of soil heavy metals pollution.The experiment was conducted from March,2014 through November,2015,the irrigation frequency (I3,I4 and I5 were irrigated 3,4 and 5 times,respectively,and the irrigation amount was 0.15 m) and frequency of fertilizer (base fertilizer was 0.74 g/m3,fertilizer amount was 1.3 g/m3,according to water consumption of 0.01 m,according to frequency of F0,F1,F2,F3 and F4) were set up as two factors.Results showed that under the influence of irrigation frequency,mustard leaves of super oxide dismutase (sod) activity and proline were increased with the increase of irrigation frequency,malondialdehyde was on the decline.Biomass,cadmium mass fraction,cadmium enrichment coefficient,cadmium total accumulated amount of cadmium of I4 was increased by 12.33％ ～ 89.71％,5.00％ ～ 44.33％,0.50％ ～55.36％ and 22.22％ ～ 114.81％,and those of I5 were increased by 19.21％ ～ 87.37％,24.00％ ～93.51％,13.44％ ～ 112.30％ and 77.42％ ～ 168.75％,respectively,compared with those of I3.The growth of biomass in the aboveground was greater than that of the root,but the root of the cadmium mass fraction,the cadmium concentration coefficient and the total amount of cadmium accumulation were greater than the ground.In the influence of fertilization frequency,mustard of biomass,cadmium mass fraction,cadmium total cadmium accumulation and cadmium enrichment coefficient under high frequency fertilization (F4) were increased by 22.55％ ～ 99.71％,30.68％ ～ 87.40％,37.80％ ～ 112.20％ and 71.43％ ～ 213.51％ than those under low frequency fertilization (F1),respectively,the roots growing rate was greater than the grounds in low frequency irrigation,and the middle and higher frequencies of irrigation the ground was lower than the roots.In addition,the cadmium transfer coefficient was decreased slightly with the increase of supply of water and fertilizer,but the overall maintenance level was high.Through model simulation and verification,the result showed that the ability of mustard heavy metal repair to be consistent with the frequency response of water and fertilizer.
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