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采用盆栽实验,研究外源添加过磷酸钙(SSP)、磷酸二铵(DAP)对于铅胁迫下水稻的生长、铅吸收和铅分布的影响.结果表明:在铅胁迫下,水稻根、茎叶、籽粒的生物量随着两种磷肥浓度的增大而增大,以施加DAP的水稻茎和叶生物量增幅最大,分别增加13.77%和44.17%.水稻体内铅大部分分布在细胞壁中,并随铅浓度的增加,两种磷肥提高了细胞壁对铅的固定能力,有效抑制了水稻对Pb的吸收,Pb在水稻体内的分布表现为根>茎>叶>籽粒,其中SSP的效果大于DAP,施加SSP有效地降低了水稻籽粒Pb的含量.
Pot experiments were conducted to study the effects of exogenous addition of SSP and DAP on the growth, lead uptake and lead distribution of rice under lead stress.The results showed that under the stress of lead, , The biomass of the grain increased with the increase of the concentration of the two phosphate fertilizers, and the biomass of stems and leaves increased by 13.77% and 44.17%, respectively, with DAP applied. Most of the lead in rice was distributed in the cell wall With the increase of Pb concentration, the two kinds of phosphate fertilizer increased the ability of cell wall to fix Pb and effectively inhibited the Pb uptake by rice. The distribution of Pb in rice was root> stem> leaf> grain, and the effect of SSP was greater than that of DAP. Application of SSP effectively reduced the content of Pb in rice grain.