不同母质发育土壤添加砷对水稻生长发育的影响
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农业部与财政部科研专项(NBCH2016–6)


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    摘要:

    以湖南3种典型母质发育的水稻土,即第四纪红土发育的红黄泥、花岗岩风化物发育的麻沙泥和河流冲积物发育的河沙泥为供试土壤,通过添加砷(0、5、10、20、30 mg/kg)进行盆栽试验,研究砷对早稻生长发育、产量及水稻吸收累积砷的影响。结果表明:添加砷5~10 mg/kg,对所测水稻的生长发育各指标均无显著影响;添加砷20~30 mg/kg,除麻沙泥添砷30 mg/kg分蘖数稍有降低(无统计学意义)外,其他处理水稻的分蘖数及稻谷产量较对照均显著下降,其中河沙泥绝收无籽实,红黄泥稻谷减产47.2%~84.8%,麻沙泥减产24.8%~48.6%;随土壤添砷增加,各处理稻秆和精米总砷含量均增加,添砷≥20 mg/kg,3种水稻土秸秆砷和精米总砷含量较对照增长均超过100%,其中均以河沙泥的增幅最大,但精米总砷含量未超过国家粮食总砷标准(0.7 mg/kg,GB4810— 1994)。相关性分析表明,水稻株高、分蘖数及稻谷干质量等与土壤有效砷含量呈极显著负相关。3种水稻土中以河沙泥砷的污染毒害最大。

    Abstract:

    3 paddy soils developed from typical parent material in Hunan province were used as the tested soil in this study, such as the reddish clayey soil, granitic sandy soil and alluvial sandy soil respectively from the quaternary red soil, the weathered granite and the river alluvium. Pot experiment was conducted to investigate the effects of arsenic on the growth, yield and uptake of arsenic in early rice by treating arsenic (0, 5, 10, 20, 30 mg/kg).The results showed that with treatment of 0–10 mg/kg, no significant effect on the indexes of rice growth and development was observed. While with arsenic treatment between 20–30 mg/kg, the tiller number and rice yield were significantly lower than that of the control: no harvest from alluvial sandy soil, 47.2%–84.8% lower for granitic sandy soil, and 24.8%–48.6% for reddish clayey soil was respectively. The arsenic content in rice straw and milled rice increased with the treatment arsenic concentration. As the addition arsenic above 20 mg/kg, the arsenic content of straw and milled rice all increased more than 100% when compared with the control treatment for the 3 paddy soil, of which the most amplification was alluvial sandy mud. Correlation analysis showed that the plant height, tiller number and dry weight of rice were correlated with soil available arsenic content in a negative way. Arsenic toxicity in alluvial sandy soil was the most serious among 3 paddy soils.

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周伟军,王翠红,石敏,卜思怡,吴佳琪.不同母质发育土壤添加砷对水稻生长发育的影响[J].湖南农业大学学报:自然科学版,2018,44(4):.

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  • 在线发布日期: 2018-07-31
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