砷水灌溉对土壤环境和水稻植株的影响研究

Effects of Arsenic Water Irrigation on Soil Environment and Rice Plants

通过小区种植试验,研究不同浓度(0.292,0.146,0.102,0.073,0.05,0.029mg/L)砷水灌溉对小区土壤、水稻产量、品质的影响以及砷在水稻植株中的运移规律。结果表明,不同浓度砷水灌溉下,土壤中的砷浓度与灌溉浓度正相关,砷水浓度大时土壤对砷的吸收能力减小,呈现出随砷水浓度的增大,砷含量增长速度先快后慢现象。砷水灌溉对水稻产量、外观品质和碾米品质有一定抑制作用,对水稻的营养品质无明显不利影响。稻米中砷的浓度随着砷水浓度的增大而增大。灌溉水砷浓度小于0.292mg/L时,精米中砷含量小于绿色大米限值。水稻植株中的含量分布规律为根>叶>茎>精米,根系对砷的吸收能力随着砷水浓度的增大而明显增强,根中砷含量大于3倍叶中含量。

Through planting plot experiment,the effects of arsenic water irrigation at different concentrations（0.292,0.146,0.102,0.073,0.05,0.029mg/L）on soil,rice yield and quality,and transport law of arsenic in rice plants are studied in this paper.The results show that under the arsenic water irrigation with different concentration,the arsenic concentrations of soil is positively correlated with the arsenic concentration of irrigation water;the arsenic absorption capacity of soil decreases when the arsenic concentration of irrigation water is high,it increases first and then decrease with the increase of the arsenic concentration of irrigation water;arsenic water irrigation has certain inhibition effect on rice yield and quality,while has no significant adverse effects on the nutritional quality of rice;the arsenic concentration in rice increases with the increase of the arsenic concentration of irrigation water;when the arsenic concentration irrigation water is less than 0.292mg/L,the arsenic content in polished rice is less than limited value of green rice;the distribution law of arsenic in the rice plant is rootleaf stem milled rice;the arsenic absorption capacity of roots significantly increases with the increase of the arsenic concentration of irrigation water;the arsenic content in root is larger than 3times of that in leaf.