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| 海南岛农田土壤Se的地球化学特征 | |
| 引用本文： | 杨忠芳,余涛,侯青叶,杨奕,傅杨荣,赵相雷.海南岛农田土壤Se的地球化学特征[J].现代地质,2012,26(5):837-849. |
| 作者姓名： | 杨忠芳 余涛 侯青叶 杨奕 傅杨荣 赵相雷 |
| 作者单位： | 1. 中国地质大学地球科学与资源学院,北京,100083 2. 海南省地质调查院,海南海口,570226 3. 中国地质大学地球科学与资源学院,北京100083;河北省地质调查院,河北石家庄050081 |
| 基金项目： | 中国地质调查局地质调查工作项目“海南岛农田生态地球化学评价”;“中国农田、河流生态系统地球化学评价成果集成” |
| 摘 要： | Se是人和动物必需的微量元素之一,具有广阔的开发应用前景,研究土壤中Se的地球化学分布规律和生物有效性控制因素意义重大。系统总结了海南岛27 426 km2范围内土壤Se的含量特征和影响因素。结果表明,研究区69.98%土地面积为足硒和富硒土壤,表层土壤Se含量在一定程度上继承了成土母岩(或深层土壤)Se含量,但不同成土母岩形成的表层土壤Se含量富集贫化趋势不同。进一步研究显示,土壤中Se含量与有机碳、Al2O3、TFe2O3、Mn和CIA等具有显著的正相关关系,说明土壤中粘土矿物、有机碳、铁锰氧化物及风化淋溶程度对Se的地球化学行为有重要影响,同时这些指标又是影响土壤Se生物有效性的重要参数。土壤有机碳、粘粒、CEC等含量或指标越高,Se的生物有效性越低。研究区土壤pH6.5时,土壤Se含量较低;土壤pH6.5时,土壤Se含量随pH下降而增加;当土壤pH为5.5～7.5时,土壤Se生物有效性相对较高。因此,开发富硒农产品不但要依据土壤总Se含量,还必须考虑土壤pH、TOC、CEC、粘粒等指标含量。 |
| 关 键 词： | 土壤Se含量 生物有效性 地球化学特征 影响因素 海南岛 |
Geochemical Characteristics of Soil Selenium in Farmland of Hainan Island |
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| YANG Zhong-fang , YU Tao , HOU Qing-ye , YANG Yi , FU Yang-rong , ZHAO Xiang-lei.Geochemical Characteristics of Soil Selenium in Farmland of Hainan Island[J].Geoscience——Journal of Graduate School,China University of Geosciences,2012,26(5):837-849. | |
| Authors: | YANG Zhong-fang YU Tao HOU Qing-ye YANG Yi FU Yang-rong ZHAO Xiang-lei |
| Institution: | 1,3(1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;2.Hainan Institute of Geological Survey,Haikou,Hainan 570226,China;3.Hebei Institute of Geological Survey,Shijiazhuang,Hebei 050081,China) |
| Abstract: | Selenium is one of the most important trace elements for human and animal,which also has a bright application future.The research of geochemical distribution and bioavailability controlling factors of soil selenium has important significance.In this paper,characteristics and influencing factors of soil selenium content all over the Hainan Island covering the range of 27,426 km2 were summarized.The results showed that the selenium-full and selenium-rich soil was up to 69.98% of the study area and topsoil selenium content to a certain extent inherited into the soil parent rock(or deep soil),but the difference among soil parent rock formation gene-rated enrichment or dilution of soil selenium content.Further studies have shown that the selenium content in soil has a significant positive correlation with organic carbon,aluminum oxide,total iron oxide,manganese,and the CIA,indicating that the clay minerals,organic carbon,iron and manganese oxides in the soil and weathering and leaching extent were playing important roles in the geochemical behaviors of selenium,while these indicators were important parameters to affect the bioavailability of soil selenium.The bioavailability of soil selenium reduced with increasing content of soil organic carbon,clay,CEC and other indicators.In the study area,when the soil pH is higher than 6.5,the soil selenium content is lower.While the soil pH is lower than 6.5,the soil selenium content increase with the pH decreasing.As the soil pH is 5.5 to 7.5,the bioavailability of soil selenium is relatively higher.Therefore,developing selenium-rich agricultural products not only is based on the total level of Se in the soil but also the range of content of the soil pH,TOC,CEC,clay and other indicators should be considered. |
| Keywords: | soil selenium content bioavailability geochemical characteristic influencing factor Hainan Island |
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