摘要
通过水泥池小区试验,研究了淹水(CF)和干湿交替(IF)两种水分管理模式对常规稻(C)与杂交稻(H)生长及重金属Pb、Cr、Cd富集的影响。结果表明,干湿交替(IF)处理能显著提高水稻的生物量及产量,增强了Pb、Cr、Cd在土壤-水稻系统中的迁移能力,并显著促进水稻根系对Cd的富集,提高米粒中Cr的含量。研究结果还表明,水分管理对Cr在水稻体内的迁移特性的影响明显不同于Pb和Cd。Pb、Cd在水稻体内含量呈现根>茎叶>米粒,而Cr则为米粒/茎叶>根,且不同水分管理模式对常规稻(C)米粒富集Cr的影响较杂交稻(H)大。可见,干湿交替模式虽能促进水稻生长和增产,同时却显著提高了Cd和Cr的生物有效性。因此,在采取相应水分管理模式降低重金属生物有效性时应充分考虑水稻对不同重金属类型的响应差异,才能更有效地控制当前农田环境的重金属污染。
A pool experiment was conducted to study the effects of two water management modes as continuous flood（CF） and interval flood （IF） on the growth and Pb, Cd, and Cr accumulation of two kinds of Oryza sativa L. （conventional rice and hybrid rice） cultivars. The results showed that the irrigation mode of IF signieantly increased the rice biomass and yield. However, this irrigation mode enhanced the mobiliza- tion of Pb, Cd, and Cr in the soil-rice system and signicantly increased the accumulation of Cd in the roots and Cr in the grains. Further- more, the transport characteristics of Cr were different from those of Pb and Cd in the rice system during the water management modes. The accumulation order of Pb and Cd in the rice was root〉stem and leg〉grain, whereas grain/stem and leaf〉root was the order for Cr. In addi- tion, the water management modes had a greater impact on the accumulation of Cr in the grain of conventional rice than in the grain of hy- brid rice. Although the IF irrigation mode could significantly promote the growth of rice, it significantly increased the bioavailabilities of Cd and Cr as well. Therefore, the different responses of rice to different heavy metals should be considered when water management is conduct- ed to reduce heavy metal bioavailability and heavy metal pollution, in order to effectively mitigate heavy metal pollution in farmland environ- ment systems.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2017年第11期2177-2184,共8页
Journal of Agro-Environment Science
基金
国家高技术研究发展计划("863计划")项目(2013AA102402)
国家自然科学基金资助项目(41271469)
广东省科技计划项目(2013B020303001
2015B090903077)~~
关键词
水稻
水分管理
重金属迁移特性
rice（Oryza sativa L. ）
water management
heavy metal transport characteristics
