Study on the Relationship between Soil Selenium and Plant Selenium Uptake
Study on the Relationship between Soil Selenium and Plant Selenium Uptake
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DOI：
10.1007/s11104-005-7011-9
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发表时间：
2005-12
期刊：
影响因子：
4.9
通讯作者：
Chengyi Zhao;Jinghua Ren;C. Xue;E. Lin
中科院分区：
文献类型：
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作者：
Chengyi Zhao;Jinghua Ren;C. Xue;E. Lin
用不同的提取方法测定了中国第二富硒区土壤和植物中的硒含量。结果表明，研究区茶叶硒含量在1.009~2.6m g/kg之间，表明紫阳县茶区属富硒区。本研究中评价的四种提取方法提供了关于土壤和植物硒水平的不同信息。该项目的质量控制/质量保证方案表明，土壤全硒和浸提态硒之间有很好的一致性。例如，通过线性回归分析发现，田间调查和温室研究的磷可提取硒结果高度相关(R2>；(0.91))。黑麦苗期试验结果进一步表明，磷可提取硒与植物吸收有显著相关性，0.1M磷酸二氢钾溶液可作为土壤有效硒的萃取剂。在酸性土壤中，当Se6+-Se和≥的含量分别为0.5m g/kg和2.0m g/kg时，对甘蓝型油菜产量的影响不明显。白菜对Se~(6+)-Se的吸收高于Se~(4+)-Se。影响土壤Se生物有效性的主要因素依次为CaCO3、粉粒、有机质和粘粒。PH值对KH_2PO_4通过CaCO_3提取的Se有影响。
Various extraction methods have been used to determine selenium (Se) concentrations in soils and plants in the second seleniferous regions of China. Our results show tea Se contents in the study area range from 1.009 to 2.6 mg/kg, which reveal that the tea areas in Ziyang County are in seleniferous regions. The four extraction methods evaluated in this study provide different information concerning soil and plant Se levels. The quality control/quality assurance program for this project indicated there is excellent agreement between total soil Se and extractable Se. For example, phosphate extractable Se results from the field investigation and greenhouse study were found to be highly correlated (R2> 0.91) by linear regression analyses. Results from rye seedling experiments further show phosphate extractable Se has significant correlations with plant Se uptake and that a 0.1 M solution of KH2PO4can be used as the extractant of soil available Se. In the acid soil, theBrassica campestrisyield could be significantly reduced when the content of Se6+–Se ≥ 0.5 mg/kg, and the influence on the yield was not as obvious when the content of Se6+–Se reached up to 2.0 mg/kg. The uptake byBrassica campestrisof Se6+–Se is higher than that of Se4+–Se. The main factors influencing the biological availability of soil Se, in order of their importance are CaCO3, the presence of silt grains, organic matter and the presence of clay grains. pH could affect KH2PO4extractable Se through CaCO3.