| 贵州镇远县耕地土壤中硒的分布特征及控制因素 |
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| 引用本文： | 杨志忠,周文龙,罗勇军,蒲庆隆,令狐东,宋小军.贵州镇远县耕地土壤中硒的分布特征及控制因素[J].现代地质,2021,35(2):434-442. |
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| 作者姓名： | 杨志忠 周文龙 罗勇军 蒲庆隆 令狐东 宋小军 |
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| 作者单位： | 贵州省有色金属和核工业地质勘查局 地质矿产勘查院,贵州 贵阳 550005 |
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| 基金项目： | 贵州省公益性扶贫项目“贵州省镇远县耕地质量地球化学调查评价”(2017-03-23) |
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| 摘 要： | 依据镇远县耕地质量地球化学调查成果,对全县耕地表层土壤硒分布特征和控制因素进行了分析。结果显示:镇远县耕地土壤硒含量平均值为(0.64±0.56) mg/kg,富硒耕地硒含量平均值为(0.72±0.42) mg/kg,富硒耕地面积占总耕地面积的82.71%。全县耕地土壤硒含量受pH值、海拔、地形地貌、成土母岩、土壤类型和土地利用类型的影响,统计发现:偏酸性耕地、海拔800 m以下耕地、分布在槽沟和谷地的耕地、碳质岩系地层分布区耕地、粗骨土和红壤分布区、茶园和水田表层土壤均具有相对较高的硒含量。分析认为成土母岩是土壤硒的最重要来源,其对土壤中硒元素含量具有控制作用,尤以含碳硅质岩系最为明显,另外土壤有机质及pH值通过改变土壤理化性质深刻影响着硒的迁移及富集,进而影响土壤硒含量。
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| 关 键 词： | 控制因素 分布特征 硒含量 耕地 贵州镇远县 |
| 收稿时间： | 2020-04-13 |
| 修稿时间： | 2020-09-10 |
Distribution of Soil Selenium of the Cultivated Land and Its Controlling Factors in Zhenyuan of Guizhou Province |
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| YANG Zhizhong,ZHOU Wenlong,LUO Yongjun,PU Qinglong,LING Hudong,SONG Xiaojun.Distribution of Soil Selenium of the Cultivated Land and Its Controlling Factors in Zhenyuan of Guizhou Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(2):434-442. |
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| Authors: | YANG Zhizhong ZHOU Wenlong LUO Yongjun PU Qinglong LING Hudong SONG Xiaojun |
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| Institution: | Institute of Geology and Mineral Resources Exploration,Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang,Guizhou 550005,China |
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| Abstract: | The distribution characteristics and controlling factors of soil selenium in the surface layer of cultiva-ted land were analyzed based on the investigation of cultivated land quality in Zhenyuan County. The results showed that the average soil Se content of cultivated land is (0.64±0.56) mg /kg, Se content of the Se-rich cultivated land is (0.72±0.42) mg /kg. The area of Se-rich cultivated land accounted for 82.71% of the total cultivated land area in Zhenyuan County. The content of soil selenium in cultivated land is affected by pH value, elevation, landform, parent rock, soil type and land use type. Also, the results showed that there are relatively high selenium contents in the acid cultivated land, the cultivated land below 800 m above sea level, the cultivated land in furrow and valley, the cultivated land in carbonaceous strata, the coarse-grained soil and red soil, the soil in tea garden and paddy field. It is considered that the parent rock is the most important source of soil selenium, which controls the content of selenium in soil, especially the carbonaceous siliceous rock series. In addition, soil organic matter and pH can change the physical and chemical properties of soil and affect the migration and accumulation of Se, and then affect the content of Se in soil. |
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| Keywords: | controlling factor distribution characteristic selenium content cultivated land Zhengyuan County of Guizhou Province |
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