黄淮海平原小麦吸收镉与土壤可浸提镉间关系研究

发布时间：2018-12-31 07:54

【摘要】：土壤重金属镉浸提量与小麦吸收镉量关系是评价浸提方法以及土壤中镉有效性的重要依据,为了给黄淮海平原小麦产区土壤镉污染评价提供科技支撑。分别采用0.43 mol·L~(-1)HNO_3、0.1 mol·L~(-1)HCl、0.05 mol·L~(-1)EDTA浸提土壤镉的方法对黄淮海平原11个不同地点大田土壤样品和24个小麦植株样品进行了测定,并对3种不同浸提剂浸提的土壤有效态镉量间的相互关系,及土壤浸提镉含量与小麦镉含量间的关系进行了探讨。结果表明:不同浸提剂浸提的土壤Cd含量、全量间的相关关系均达极显著水平;3种浸提剂的Cd浸提率为58.7%(0.43 mol·L~(-1)HNO_3)53.2%(0.05 mol·L~(-1)EDTA)25.9%(0.1 mol·L~(-1)HCl),不同浸提剂浸提的土壤有效态Cd含量与小麦植株Cd含量的相关性顺序为r=0.74(0.05 mol·L~(-1)EDTA)r=0.64(0.43 mol·L~(-1)HNO_3)r=0.49(0.1 mol·L~(-1)HCl);在pH为7.71~8.59和土壤全Cd含量范围为0.107~0.212 mg·kg~(-1)条件下,以EDTA浸提的土壤Cd含量及土壤Cd全量结合土壤pH值建立的方程可以较好地预测小麦籽粒Cd含量;经推算,EDTA浸提的土壤Cd和土壤Cd全量的安全临界值可分别为0.671 mg·kg~(-1)和1.02 mg·kg~(-1)。
[Abstract]:The relationship between the amount of heavy metal cadmium extracted from soil and the amount of cadmium absorbed by wheat is an important basis for evaluating the extraction method and the availability of cadmium in soil, which provides scientific and technological support for the evaluation of soil cadmium pollution in wheat producing areas in the Huang-Huai-Hai Plain. 0.43 mol L ~ (-1) HNO_3,0.1 mol L ~ (-1) HCl, Soil cadmium was extracted by 0.05 mol L ~ (-1) EDTA. Soil samples and 24 wheat plant samples from 11 different sites in Huang-Huai-Hai Plain were determined. The relationship between available cadmium content in soil and the relationship between soil cadmium content and wheat cadmium content were also discussed. The results showed that the correlation between the content of Cd and the total amount of Cd reached a very significant level. The Cd extraction rate of the three extractants was 58.7% (0.43 mol L ~ (-1) HNO_3) 53.2% (0.05 mol L ~ (-1) EDTA) 25.9% (0.1 mol L ~ (-1) HCl),). The order of correlation between soil available Cd content and Cd content in wheat plant was 0. 74 (0. 05 mol L ~ (-1) EDTA) 0. 64 (0. 43 mol L ~ (-1) HNO_3) r = 0. 49 (0. 0. 0. 05 mol L ~ (-1) EDTA) 0. 64 (0. 43 mol L ~ (-1) HNO_3). .1 mol L ~ (-1) HCl); Under the conditions of pH 7.71 ~ 8.59 and soil total Cd content 0.107 ~ 0.212 mg kg~ (-1), the equation of soil Cd content extracted by EDTA and soil Cd content combined with soil pH value could be used to predict the Cd content of wheat grain. The safe critical values of soil Cd and soil Cd extracted by EDTA were calculated to be 0.671 mg kg~ (-1) and 1.02 mg kg~ (-1), respectively.
【作者单位】：中国农业科学院农业资源与农业区划研究所国家土壤肥力与肥料效益监测网站;国家半干旱农业工程技术研究中心;
【基金】：河北省科技计划项目(15274008D) 公益性行业(环保)科研专项(201509032) 国家科技支撑项目(2015BAD05B01)
【分类号】：X53;S512.1

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