Peng Hua, Deng Kai, Shi Yu, Wei Wei, Liu Sai-Hua, Ji Xiong-Hui
Hunan Institute of Agricultural Environment and Ecology, Hunan Academy of Agricultural Sciences, Changsha 410125, China.
Ministry of Agriculture and Rural Affairs Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River, Changsha 410125, China.
Huan Jing Ke Xue. 2022 Aug 8;43(8):4271-4281. doi: 10.13227/j.hjkx.202110213.
The impacts of silicon (Si) fertilizers on cadmium (Cd) bioavailability in soil and Cd accumulation in paddy-rice plants were investigated in a field positioning test. The results indicated that the continuous application of 180 kg·hm Si fertilizers improved soil bioavailable Si in paddy-rice fields by 108.1%-275.0% and improved pH values by 1.15-1.33 in soil. The difference in the contents of DTPA-Cd in soil by 12.3% and 15.9% was significant in early and late rice, respectively. The continuous application of silicon promoted the transformation of soil cadmium to a stable form and reduced the contents of exchangeable Cd and carbonate binding state Cd in the soil by 2.6%-5.1% and 8.6%-24.9%. The contents of ferric manganese oxide binding state Cd were increased significantly; meanwhile, the contents of organic binding state Cd and residue state Cd in soil were improved by 2.3%-12.8% and 2.3%-6.0%, respectively. The contents of Cd in the root, shoot, and rice were reduced by 38.4%, 49.7%, and 50.9% in early season rice and by 30.6%, 34.4%, and 39.2% in late season rice, respectively. The absorption factors and translocation factors were reduced significantly by 25.5%-49.6% and 13.5%-52.6%, and the average bioaccumulation factors were decreased by 6.0% and 8.0% in early and late season rice. The powder Si fertilizer had the best results overall. In conclusion, Si fertilizer could reduce the absorption and accumulation in rice; however, the continuous Cd reduction effect of continuous application Si fertilizer was not obvious.
通过田间定位试验，研究了硅（Si）肥对土壤中镉（Cd）生物有效性及水稻植株中Cd积累的影响。结果表明，连续施用180 kg·hm硅肥使稻田土壤有效硅提高了108.1%-275.0%，土壤pH值提高了1.15-1.33。土壤中DTPA-Cd含量在早稻和晚稻中分别显著降低了12.3%和15.9%。连续施用硅促进了土壤镉向稳定形态的转化，使土壤中交换态Cd和碳酸盐结合态Cd含量分别降低了2.6%-5.1%和8.6%-24.9%。铁锰氧化物结合态Cd含量显著增加；同时，土壤中有机结合态Cd和残渣态Cd含量分别提高了2.3%-12.8%和2.3%-6.0%。早稻根、茎和稻谷中Cd含量分别降低了38.4%、49.7%和50.9%，晚稻分别降低了30.6%、34.4%和39.2%。吸收系数和转运系数分别显著降低了25.5%-49.6%和13.5%-52.6%，早稻和晚稻的平均生物累积系数分别降低了6.0%和8.0%。总体而言，粉状硅肥效果最佳。综上所述，硅肥可降低水稻对镉的吸收和积累；然而，连续施用硅肥对镉的持续降低效果不明显。
