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外源硒与不同物料配施对水稻硒素营养及硒利用率的影响
黄太庆,江泽普,廖 青,邢 颖,梁潘霞
广西农业科学院农业资源与环境研究所
摘要:
施用外源硒是提高水稻硒含量的重要方法之一。通过盆栽试验,设置常规化肥(F)、化肥+有机肥(FO)和化肥+生物质炭(FC)3种肥料管理模式,0(Se0)、0.2(Se1)、0.4(Se2)和0.6 mg/kg(Se3)4个硒(Ⅳ)添加水平,研究在不同物料施用条件下,土施亚硒酸钠对水稻生长及硒吸收、转移和累积的影响。结果表明:施用适量外源硒对水稻产量及生物量影响不显著,但显著提高水稻各部位硒的含量,并促进硒向籽粒转移。施用有机肥和生物质炭降低了水稻根系对硒的吸收系数(RAI)。施用有机肥不利于硒由稻秆向糙米和精米中转移,但适当的外源硒与生物质炭配施有利于提高硒由稻秆向糙米和精米转移系数。总之,有机肥与生物质炭的施用不能有效地提高水稻地上部,特别是籽粒的硒含量,但因施用有机肥能显著提高作物产量,从而增加水稻硒的总累积量,而生物质炭的添加则不能。水稻对外源硒的吸收利用率不超过5%。
关键词:  亚硒酸钠  转移系数  水稻  硒累积  硒肥利用率
DOI:10.13758/j.cnki.tr.2019.02.009
分类号:S143.7+1
基金项目:广西自然科学基金项目(2017GXNSFBA198112,2016GXNSFBA380009)和广西农业科学院科技发展基金项目(桂农科2017JM10)资助。
Effects of Exogenous Selenium Added with Different Materials to Soil on Rice Selenium (Se) Nutrition and Utilization
HUANG Taiqing1, JIANG Zepu2, LIAO Qing2, XING Ying2, LIANG Panxia2
1.Agricultural Resource and Environment Research Institute, Guangxi Academy of Agricultural Science;2.Agricultural Resource and Environment Research Institute,Guangxi Academy of Agricultural Science
Abstract:
Exogenous selenium (Se) input is one of the most important ways to improve Se content in rice. A pot experiment was conducted to study the effects of exogenous Se input with different materials to soil on rice growth, Se adsorption, transportation and accumulation by rice. The treatments were designed as follows : three fertilization patterns of chemical fertilizer (F), F + organic fertilizer (FO) and F + biochar (FC); four exogenous selenium(IV) levels of 0 mg/kg soil (Se0), 0.2 mg/kg soil (Se1), 0.4 mg/kg soil (Se2) and 0.6 mg/kg soil (Se3). The results showed that appropriate exogenous Se didn′t influence significantly rice yield and biomass, but improved Se content in rice significantly and promoted Se in stems and leaves transported to grain. FO and FC treatments decreased root absorption index (RAI) of Se. FO treatment hindered Se in stems and leaves transported to rice grains, but input of appropriate exogenous Se with FC could enhance it. In a word, FO and FC treatments could not improve Se content in the above-ground part of rice, especially reduced Se content in rice grain. Organic fertilizer improved rice yield significantly so it accumulated more Se in rice biomass, but biochar had no such effect. Exogenous Se utilization by rice is below 5%.
Key words:  Selenite (Se)  Transport index  Rice  Se accumulation  Se utilization

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