论文部分内容阅读
通过溶液培养试验,研究两种价态锑Sb(Ⅲ)和Sb(Ⅴ)与Si交互作用对水稻吸收积累Sb和Si的影响。结果表明,这两种价态的Sb对水稻生长均有抑制作用,Sb(Ⅲ)比Sb(Ⅴ)对水稻毒害更明显,施Si可缓解Sb对水稻的毒害。Sb(Ⅲ)和Sb(Ⅴ)的添加可显著地影响水稻根系和茎叶对Si的吸收积累。当Si的浓度为1.0mmol·L-1时,添加30μmol·L-1Sb(Ⅲ)和Sb(Ⅴ)可使水稻根系Si含量分别比对照处理降低46.0%和36.0%,水稻茎叶Si含量分别降低52.2%和23.5%。同样,Si的添加也可以显著地降低水稻根系和茎叶对两个价态Sb的吸收积累。在10μmol·L-1Sb(Ⅲ)处理下,添加1.0和2.0 mmol·L-1的Si可使水稻根系和茎叶Sb浓度分别比对照降低52.0%~88.4%和24.6%~45.4%;在10μmol·L-1Sb(Ⅴ)处理下,添加1.0 mmol·L-1和2.0 mmol·L-1的Si可使水稻根系和茎叶Sb浓度分别比对照降低53.8%~75.5%和34.8%~49.6%。Si的添加对Sb在水稻根系和茎叶中的富集系数和分配比率也有显著影响。研究结果表明,在Sb污染农田中可通过施用Si肥来提高植物的Si营养,降低植物对Sb的吸收积累,从而降低Sb的危害。
The effect of interaction between two valence antimony Sb (Ⅲ) and Sb (Ⅴ) and Si on the absorption and accumulation of Sb and Si in rice was studied by solution culture test. The results showed that these two valences of Sb inhibited the growth of rice, and the toxicity of Sb (Ⅴ) to rice was more obvious than that of Sb (Ⅴ). Si could alleviate the toxicity of Sb to rice. The addition of Sb (Ⅲ) and Sb (Ⅴ) could significantly affect the absorption and accumulation of Si in rice roots and stems and leaves. When the concentration of Si was 1.0 mmol·L-1, the content of Si in rice roots decreased by 46.0% and 36.0%, respectively, compared with the control, with the addition of 30μmol·L-1Sb (Ⅲ) and Sb (Ⅴ) Reduce by 52.2% and 23.5%. Similarly, the addition of Si also significantly reduced the uptake and accumulation of two valence Sb in rice roots and stems and leaves. Under the treatment of 10μmol·L-1Sb (Ⅲ), adding 1.0 and 2.0 mmol·L-1 of Si reduced the concentration of Sb in root and shoot by 52.0% -88.4% and 24.6% -45.4%, respectively. Under the treatment of L-1Sb (Ⅴ), adding 1.0 mmol·L-1 and 2.0 mmol·L-1 Si reduced the Sb concentration in roots and stems and leaves by 53.8% -75.5% and 34.8% -49.6% . The addition of Si also had a significant effect on the enrichment coefficient and distribution ratio of Sb in rice roots and stems and leaves. The results showed that Si fertilizers could be used to increase the Si nutrition of plants and reduce the absorption and accumulation of Sb in plants so as to reduce the harm of Sb.