钙镁磷肥对土壤Cd生物有效性和糙米Cd含量的影响
发布时间:2017-12-27 12:03
本文关键词:钙镁磷肥对土壤Cd生物有效性和糙米Cd含量的影响 出处:《环境科学学报》2017年06期 论文类型:期刊论文
【摘要】:通过水稻盆栽试验,研究了施用钙镁磷肥对Cd污染稻田中Ca、Mg、Cd生物有效性的影响和种植水稻(湘晚籼12号、威优46号)后水稻各部位Ca、Mg、Cd含量的差异.结果表明,施用钙镁磷肥能显著提升土壤pH值,降低土壤TCLP提取态Cd含量,且降低效果随着水稻生育期的延长逐渐增强.与对照相比,施用0.8 g·kg-1的钙镁磷肥,使湘晚籼12号种植土壤和威优46号种植土壤TCLP提取态Cd含量在熟化期、灌浆期、分蘖期、成熟期分别下降了12.7%、15.6%、21.5%、61.9%和12.7%、72.6%、42.1%、59.7%.施用钙镁磷肥能显著增加水稻种植土壤中TCLP提取态Ca、Mg含量,降低TCLP提取态Cd含量,同时显著增加水稻各生育期各部位Ca、Mg含量并降低其Cd含量,水稻各部位中Ca、Mg含量与Cd含量均呈现负相关关系,表明外源Ca和Mg的加入对水稻累积Cd产生了拮抗作用.施用钙镁磷肥能显著降低水稻糙米中Cd含量并提高水稻产量.与对照相比,施用0.2~0.8 g·kg-1的钙镁磷肥,水稻湘晚籼12号和威优46号糙米中Cd含量分别下降了36.8%~52.6%和53.3%~75.6%.威优46号比湘晚籼12号更易将土壤Cd向水稻籽粒中转运.
[Abstract]:Through the rice pot experiment, the effects of calcium magnesium phosphate on Cd pollution in paddy field Ca, Mg, influence the bioavailability of Cd and rice (xiangwanxian No. 12 and Weiyou No. 46) differences in different parts of Ca, Mg and Cd content. The results show that the application of calcium magnesium phosphate could significantly improve soil pH value, decreased soil TCLP extractable Cd content, and reduce the effect of increased gradually with prolonging growth period of rice. Compared with the control, application of 0.8 g - kg-1 calcium magnesium phosphate, make xiangwanxian extractable Cd content in ripening stage, filling stage and tillering stage and mature stage were decreased by 12.7%, 15.6%, 21.5%. 61.9% and 12.7%, 72.6%, 42.1%, 59.7%. the application of calcium magnesium phosphate significantly increased the TCLP extractable Ca and Mg contents in rice planting soil in 12 planting soil and planting Weiyou 46 soil TCLP, extractable Cd decreased the content of TCLP, and a significant increase in the growth period of rice Part Ca, Mg content and decrease the content of Cd, Ca and Mg in different parts of rice and Cd contents were negatively correlated, indicating that exogenous Ca and Mg addition had antagonistic effects on rice and accumulation of Cd. The application of calcium magnesium phosphate can significantly reduce the Cd content in brown rice and rice yield increased. Compared with the control. The application of 0.2~0.8 g calcium magnesium phosphate kg-1, Cd content of rice xiangwanxian 12 and Weiyou No. 46 in brown rice were decreased by 36.8%~52.6% and 53.3%~75.6%. in Weiyou 46 than xiangwanxian 12 more soil Cd to rice grain transport.
【作者单位】: 湖南农业大学资源与环境学院;中南林业科技大学环境科学与工程学院;
【基金】:湖南省农业厅项目(No.湘农业联2014-137-2) 农业公益性行业科研专项(No.201503104) 国家自然科学基金(No.41201530) 湖南省重点学科建设项目(No.2006180)~~
【分类号】:S143;X53
【正文快照】: 1引言(Introduction)2014年国家环保部和国土资源部联合发布的《全国土壤污染状况调查公报》中显示,我国大量的农田受到重金属等污染物的威胁,镉污染问题尤为突出,其点位超标率为7%,排在所有无机污染物的首位(环境保护部和国土资源部,2014).基于我国的人口压力与粮食安全现状,
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