南方典型区域水稻镉富集系数差异影响因素探析

发布时间：2019-03-21 18:46

【摘要】：该研究通过自采样分析及综合其他人员研究结果分析了我国南方典型稻米产区水稻吸收镉差异性。方差分析结果表明我国南方稻米产区稻米镉富集系数差异显著且可划分为高吸收(富集系数平均值及标准差为(0.96±0.73)、中高吸收(0.64±0.59)、中低吸收(0.29±0.22)及低吸收(0.26±0.30)4种类型,在19个研究区内中及中低吸收型(富集系数介于0.2~0.3)是4种类型中最常见的。对土壤p H、有机质含量、质地、土壤类型、土壤镉含量、土壤Zn/Cd等影响稻米镉富集系数的因素进行了探讨,结果表明,土壤p H对稻米镉富集系数影响最大且符合韦布尔非线性方程模型。土壤有机质影响明显较p H低,土壤质地在土壤酸性条件下对稻米镉富集系数的影响要大于碱性条件,土壤Zn/Cd比对稻米镉富集系数影响也比较突出,在高Zn/Cd比的土壤中稻米镉富集系数一般较低,而土壤类型、土壤镉含量对稻米镉富集系数的影响存在较大的地域差异性。
[Abstract]:The difference of cadmium uptake in rice from typical rice producing areas in southern China was analyzed by means of self-sampling analysis and other research results. The results of ANOVA showed that the CD enrichment coefficient of rice in southern China was significantly different and could be divided into high uptake (average enrichment coefficient and standard deviation was (0.96 卤0.73), middle and high uptake (0.64 卤0.59). There are four types of low absorption (0.29 卤0.22) and low absorption (0.26 卤0.30). In 19 study areas, the middle and low absorption types (enrichment coefficient between 0.2 and 0.3) are the most common among the four types. The effects of pH, organic matter content, texture, soil type, soil cadmium content and soil Zn/Cd on CD concentration coefficient of rice were discussed. The effect of soil pH on CD enrichment coefficient of rice was the greatest and it was in accordance with Weibull nonlinear equation model. The effect of soil organic matter was significantly lower than pH, and the effect of soil texture on CD enrichment coefficient of rice was greater than that of alkaline condition under acidic condition, and the effect of soil Zn/Cd ratio on CD enrichment coefficient of rice was also more prominent. In the soil with high Zn/Cd ratio, the CD concentration coefficient of rice is generally lower, but the effect of soil type and soil CD content on the CD enrichment coefficient of rice has great regional difference.
【作者单位】：环境保护部环境规划院;农业部环境保护科研监测所;
【基金】：环保行业性科研专项(201509032,201409044)
【分类号】：X503.231;X53

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