| 江西赣县清溪地区土壤硒地球化学特征和水稻根系土硒生物有效性影响因素 |
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| 引用本文： | 刘冰权,沙珉,谢长瑜,周强强,魏星星,周梵.江西赣县清溪地区土壤硒地球化学特征和水稻根系土硒生物有效性影响因素[J].岩矿测试,2021(5):740-750. |
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| 作者姓名： | 刘冰权 沙珉 谢长瑜 周强强 魏星星 周梵 |
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| 作者单位： | 江西省地质调查研究院, 江西 南昌 330030;江西省地质矿产勘查开发局赣西地质调查大队, 江西 南昌 330002 |
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| 基金项目： | 中国地质调查局地质调查项目"海峡西岸经济区土地质量地球化学调查"（DD20160321）;中国地质调查局地质调查项目"江西赣州地区土地资源地质环境调查"（J[2014]02-021-024） |
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| 摘 要： | 江西赣南地区是典型的硒缺乏地理分布区,但近年来研究成果表明该地区稻谷富硒率高,土壤与稻谷富硒存在不一致的原因尚不明确,探讨土壤和稻谷硒含量特征和土壤硒的生物有效性,对赣南地区富硒土地资源利用和富硒农产品开发具有重要意义。本文以赣县清溪地区为研究对象,采用电感耦合等离子体质谱/发射光谱(ICP-MS/OES)等方法测定了研究区1734件表层土壤、57组稻谷及配套根系土硒等元素含量及硒形态地球化学指标;系统分析了区内土壤硒含量和分布特征、稻谷硒含量特征,探讨了根系土硒生物有效性的影响因素。结果表明:研究区表层土壤以足硒、富硒区为主,土壤硒含量与成土母岩关系密切,不同成土母岩区土壤硒含量规律为:古生代变质岩中生代花岗岩新元古代变质岩中生代陆源碎屑岩新生代第四系。根系土硒含量均未达到富硒土壤标准,稻谷富硒率为64.91%,稻谷对土壤硒的富集能力强(富集系数20.05%),当根系土硒含量≥0.25mg/kg时,水稻富硒率高达70.83%,能够稳定产出优质富硒水稻。硒的赋存形态是影响土壤硒生物有效性的主要因素,土壤总硒含量较低时,水溶态、离子可交换态、碳酸盐结合态硒的占比高,从而提升了硒的生物有效性;有机质含量低,对硒吸附能力弱,也是硒生物有效性高的重要原因。本研究认为,赣县清溪地区富硒、足硒土壤开发利用时,综合考虑土壤硒含量、土壤理化指标、硒形态对土壤硒生物有效性的影响,有利于科学指导天然富硒土地划定和富硒水稻产业开发。
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| 关 键 词： | 土壤 硒 电感耦合等离子体质谱法 电感耦合等离子体发射光谱法 地球化学特征 生物有效性 影响因素 |
| 收稿时间： | 2021/6/22 0:00:00 |
| 修稿时间： | 2021/7/31 0:00:00 |
Geochemical Characteristics of Soil Selenium and Influencing Factors of Selenium Bioavailability in Rice Root Soils in Qingxi Area, Ganxian County, Jiangxi Province |
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| LIU Bing-quan,SHA Min,XIE Chang-yu,ZHOU Qiang-qiang,WEI Xing-xing,ZHOU Fan.Geochemical Characteristics of Soil Selenium and Influencing Factors of Selenium Bioavailability in Rice Root Soils in Qingxi Area, Ganxian County, Jiangxi Province[J].Rock and Mineral Analysis,2021(5):740-750. |
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| Authors: | LIU Bing-quan SHA Min XIE Chang-yu ZHOU Qiang-qiang WEI Xing-xing ZHOU Fan |
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| Institution: | Geological Survey of Jiangxi Province, Nanchang 330030, China; The Ganxi Brigade of Geological Survey, Bureau of Geology and Mineral Exploration & Development of Jiangxi Province, Nanchang 330002, China |
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| Abstract: | BACKGROUND: The south of Jiangxi Province is a typical geographical distribution area of selenium deficiency. However, some research results in recent years indicate that the rice has high selenium content. The reasons for inconsistency about selenium enrichment between soil and rice is still not clear. It is important to discuss the characteristics of selenium content in soil and crops for the utilization of selenium-enriched land resources and the development of selenium-enriched agricultural products.OBJECTIVES: To understand the reasons of inconsistency about selenium content between soil and crops in Qingxi area, Ganxian County.METHODS: Samples of 1734 topsoil, 57 sets of rice and corresponding root soil were collected from Qingxi area. The content of selenium and its speciation geochemistry in these samples were determined by inductively coupled plasma-mass spectrometry and inductively coupled plasma-optical emission spectrometry. The selenium content and distribution characteristics in soil and rice were systematically analyzed, and the influencing factors of selenium bioavailability in root soil were discussed.RESULTS: The topsoil in the area was dominated by selenium-enriched soil and selenium-sufficient soil. The selenium content in soil were closely related to soil parent rocks. The rules of soil selenium content in different parent-rock areas were as follows:Paleozoic metamorphic rocks>Mesozoic granite>Neoproterozoic metamorphic rocks>Mesozoic terrigenous clastic rocks>Cenozoic quaternary. The selenium content in root soil were lower than 0.4mg/kg, and selenium-enrichment rate of rice was 64.91%, indicating that it had a high capacity to enrich selenium in the soil (enrichment coefficient was 20.05%). When the selenium content in root soil was more than 0.25mg/kg, the rate of selenium-enrichment reached up to 70.83%, and would produce high-quality selenium-enriched rice stably. The form of selenium was the main factor to influence selenium bioavailability in soil. When the content of total selenium in soil was low, water-soluble, ion-exchangeable and carbonate-bound selenium accounted for a high proportion, which enhanced the bioavailability of selenium. The weak ability of selenium adsorption by low content organic matter was also an important factor for the high bioavailability of selenium.CONCLUSIONS: Selenium content in soil, soil physical and chemical index and the influence of selenium form on bioavailability of selenium in soil should be comprehensively considered when exploiting selenium-enriched soil and selenium-sufficient soil in Qingxi area, Ganxian County. It is beneficial to scientifically guide the delimitation of natural selenium-enriched land and develop selenium-enriched rice. |
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| Keywords: | soil selenium inductively coupled plasma-mass spectrometry inductively coupled plasma-optical emission spectrometry geochemical characteristics bioavailability influencing factor |
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