隔沟灌溉下水肥供应频率对芥菜生理与镉富集特性影响

发布时间：2018-01-14 13:40

  本文关键词：隔沟灌溉下水肥供应频率对芥菜生理与镉富集特性影响　出处：《农业机械学报》2017年11期 　论文类型：期刊论文

  更多相关文章： 隔沟灌溉 水肥供应频率 芥菜 镉富集 土壤重金属

【摘要】：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0.15 m)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。
[Abstract]:The biomass and heavy metal accumulation and transfer characteristics of mustard under furrow irrigation were studied, which played an important role in phytoremediation of soil contaminated by heavy metals. The experiment was carried out from March 2014 to November 2015. The frequency of irrigation and the frequency of topdressing (0.74 g / m ~ 3 and 1.3 g / m ~ 3) were set respectively. The results showed that the superoxide dismutase activity and proline activity of mustard leaves increased with the increase of irrigation frequency. Malondialdehyde showed a downward trend. Biomass, CD mass ratio, cadmium enrichment coefficient, total cadmium accumulation I _ 4 were increased by 12.33%, 89.71% and 5.00%, respectively, compared with I _ 3, by 44.33%. 0.50, 55.36 and 22.22, about 114.81; I5 is 19.21% higher than I3, 87.37 and 24.00 and 93.51% higher than I3, 13.44% and 112.30% higher than I3. The increase of aboveground biomass was greater than that of root, and the increase of CD mass ratio, CD enrichment coefficient and total cadmium accumulation was larger than that of shoot. Under the influence of fertilization frequency, biomass was increased. The mass ratio of cadmium, the enrichment coefficient of cadmium and the total amount of cadmium accumulation, F4) increased by 22.55%, 99.71%, 30.68% and 87.40%, respectively, compared with those of low frequency fertilization (F1). 37.80 in the case of low frequency irrigation, the increase of the root was greater than that of the ground, and the increase of the root was higher than that of the ground. Under high frequency irrigation, the upper part of the land is larger than the root. In addition, the transfer coefficient decreases slightly with the increase of water and fertilizer supply frequency, but maintains a high level as a whole. The results showed that the response of heavy metal remediation ability of mustard to the frequency of water and fertilizer supply tended to be consistent.
【作者单位】： 江西农业大学农学院;江西青年职业学院经济管理系;江西农业大学国土资源与环境学院;
【基金】：国家自然科学基金项目(51469008、41661070) 江西省青年科学基金重点项目(20171ACB21024) 江西省科技计划项目(20151BBF60059) 江西农业大学研究生创新专项资金项目(NDYC2017-B002)
【分类号】：S637;X503.231
【正文快照】： 引言在土壤重金属污染植物修复领域,印度荠菜作为重要的土壤重金属修复植物受到国内外广泛关注,主要用来修复土壤中镉、铅和锌等重金属污染,已有研究结果表明印度芥菜具有显著的重金属富集特性且修复效率较高[1],但受土壤水肥环境影响下印度芥菜生长发育受到抑制,进而影响土壤，

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