浙江慈溪粮食主产区富硒土壤评价方法对比研究  

Comparative Study of Different Evaluation Methods of Se-rich Soil in Main Grain Producing Area of Cixi,Zhejiang Province

作　　者：王保欣[1] 韦继康 余晓霞 胡荣荣[1] WANG Baoxin;WEI Jikang;YU Xiaoxia;HU Rongrong(Zhejiang Institute of Hydrogeology and Engineering Geology,Ningbo,Zhejiang315012,China)

机构地区：[1]浙江省水文地质工程地质大队,浙江宁波315012

出　　处：《现代地质》2020年第4期672-679,共8页Geoscience

基　　金：慈溪市自然资源和规划局“慈溪市土地质量地质调查”项目(NBGXCG17021)。

摘　　要：以浙江省慈溪市粮食生产功能区为研究区,采集了94件稻谷和根系土壤样,土壤样测试了硒总量和硒形态、pH值及有机质含量,稻谷样测试了硒总量,研究了土壤和稻谷硒含量特征。依据富硒土壤界定标准及多元回归分析方法,开展了基于土壤硒总量和基于土壤硒总量与土壤理化指标的2种富硒土壤评价,并从作物实际富集效果出发,对2种评价方法进行对比研究。结果表明,研究区土壤和稻谷中硒含量属中等变异,受外界因素影响或地质背景差异小,22.3%的土壤样品和53.2%的稻谷样品达到富硒标准。2种评价方法效果差异明显,基于土壤硒总量进行富硒土壤评价,往往会遗漏大部分富硒稻谷区域,且圈定的富硒范围稻谷富硒率较低;基于土壤硒总量、土壤理化指标的富硒土壤评价,不管从包含的富硒稻谷样点数还是区内稻谷富硒率两方面,效果均显著优于基于土壤硒总量进行的富硒土壤评价。A total of 94 samples of rice and soil were collected in functional zone of grain production in Cixi City, Zhejiang Province. Soil samples were tested for total content and speciation of selenium, pH and organic matter, and rice samples were tested for selenium. The characteristics of selenium in soil and rice were analyzed. According to the standard of Se-rich soil and multivariate correlation analysis theory, the evaluation method which based on total selenium in soil was compared with which based on total selenium, physical and chemical indicators of soil. The results indicated that 22.3% of soil samples and 53.2% of rice samples reached Se-rich standard, while selenium in soil and rice showed moderate variation, proving low-level impact of external factors and same geological background. Otherwise, there were significant differences between the two evaluation me-thods, the evaluation simply based on total selenium in soil commonly omited most of the Se-rich areas, and the Se-rich areas targeted by this method actually had lower rate of Se-rich rice. In comparison, the evaluation method based on total selenium in soil, physical and chemical indicators of soil outperformed the another evaluation method due to its better results of both more Se-rich samples and higher rate of Se-rich rice in targeted areas.

关 键 词：土壤硒 土壤理化指标 稻谷硒 富硒土壤评价 对比研究 慈溪市 

分 类 号：P595[天文地球—地球化学] X142[天文地球—地质学]