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  本文關(guān)鍵詞：鈣鎂磷肥對土壤Cd生物有效性和糙米Cd含量的影響　出處：《環(huán)境科學(xué)學(xué)報》2017年06期 　論文類型：期刊論文

  更多相關(guān)文章： Cd 土壤污染 鈣鎂磷肥 水稻

【摘要】：通過水稻盆栽試驗(yàn),研究了施用鈣鎂磷肥對Cd污染稻田中Ca、Mg、Cd生物有效性的影響和種植水稻(湘晚秈12號、威優(yōu)46號)后水稻各部位Ca、Mg、Cd含量的差異.結(jié)果表明,施用鈣鎂磷肥能顯著提升土壤pH值,降低土壤TCLP提取態(tài)Cd含量,且降低效果隨著水稻生育期的延長逐漸增強(qiáng).與對照相比,施用0.8 g·kg-1的鈣鎂磷肥,使湘晚秈12號種植土壤和威優(yōu)46號種植土壤TCLP提取態(tài)Cd含量在熟化期、灌漿期、分蘗期、成熟期分別下降了12.7%、15.6%、21.5%、61.9%和12.7%、72.6%、42.1%、59.7%.施用鈣鎂磷肥能顯著增加水稻種植土壤中TCLP提取態(tài)Ca、Mg含量,降低TCLP提取態(tài)Cd含量,同時顯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含量與Cd含量均呈現(xiàn)負(fù)相關(guān)關(guān)系,表明外源Ca和Mg的加入對水稻累積Cd產(chǎn)生了拮抗作用.施用鈣鎂磷肥能顯著降低水稻糙米中Cd含量并提高水稻產(chǎn)量.與對照相比,施用0.2~0.8 g·kg-1的鈣鎂磷肥,水稻湘晚秈12號和威優(yōu)46號糙米中Cd含量分別下降了36.8%~52.6%和53.3%~75.6%.威優(yōu)46號比湘晚秈12號更易將土壤Cd向水稻籽粒中轉(zhuǎn)運(yùn).
[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.
【作者單位】： 湖南農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;中南林業(yè)科技大學(xué)環(huán)境科學(xué)與工程學(xué)院;
【基金】：湖南省農(nóng)業(yè)廳項目(No.湘農(nóng)業(yè)聯(lián)2014-137-2) 農(nóng)業(yè)公益性行業(yè)科研專項(No.201503104) 國家自然科學(xué)基金(No.41201530) 湖南省重點(diǎn)學(xué)科建設(shè)項目(No.2006180)~~
【分類號】：S143;X53
【正文快照】： 1引言(Introduction)2014年國家環(huán)保部和國土資源部聯(lián)合發(fā)布的《全國土壤污染狀況調(diào)查公報》中顯示,我國大量的農(nóng)田受到重金屬等污染物的威脅,鎘污染問題尤為突出,其點(diǎn)位超標(biāo)率為7%,排在所有無機(jī)污染物的首位(環(huán)境保護(hù)部和國土資源部,2014).基于我國的人口壓力與糧食安全現(xiàn)狀,

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