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罗友进,韩国辉,孙协平,廖敦秀,谢永红,魏朝富.三峡库区(重庆段)土壤硒分布特征及影响因素[J].土壤,2018,50(1):131-138. LUO Youjin,HAN Guohui,SUN Xieping,LIAO Dunxiu,XIE Yonghong,WEI Chaofu.Distribution of Soil Selenium in Three Gorges Reservoir Region (Chongqing Section) and Its Influential Factors[J].Soils,2018,50(1):131-138 本文二维码信息
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三峡库区(重庆段)土壤硒分布特征及影响因素
Distribution of Soil Selenium in Three Gorges Reservoir Region (Chongqing Section) and Its Influential Factors
投稿时间:2016-12-02  修订日期:2017-01-24
DOI:10.13758/j.cnki.tr.2018.01.018
中文关键词:  土壤硒  分布特征  影响因素  三峡库区(重庆段)
Key Words:Soil selenium  Distribution  Influential factors  Three Gorges Reservoir Region (Chongqing Section)
基金项目:国家“十二·五”科技支撑计划项目(2012BAD14B18)和国家自然科学基金青年项目(41401594)资助。
作者单位E-mail
罗友进 重庆市农业科学院 luoyoujin1984@163.com 
韩国辉 重庆市农业科学院  
孙协平 重庆市农业科学院  
廖敦秀 重庆市农业科学院  
谢永红 重庆市农业科学院  
魏朝富 西南大学资源环境学院 weicf@swu.edu.cn 
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中文摘要:
      重庆是我国缺硒(Se)的重点区域,多目标地球化学调查采用现代分析测试手段进行土壤Se元素的分布及富集的研究,对特色农业资源的开发利用具有重要意义。以每4 km2 1个表层和每16 km2 1个深层土壤数据对三峡库区重庆段土壤Se分布特征及其影响因素进行了分析探讨。结果表明:三峡库区(重庆段)表层土壤Se含量在0.006 ~ 5.79 mg/kg之间,平均值为0.16 mg/kg,以缺Se或潜在缺Se为主,其分布面积达到73.19%,足Se面积为25.77%,富Se或Se中毒区域仅为0.16%;深层土壤Se含量在0.03 ~ 0.62 mg/kg之间,平均值为0.12 mg/kg,缺Se面积占到67.36%,潜在缺Se面积也占到20.68%。不同类型间以黄壤表层土壤Se含量最高,其次是石灰土,且与水稻土和紫色土存在着显著性差异。不同土地利用方式间以林地与建筑用地表层土壤中Se含量相对较高,但各土地利用方式间不存在显著性差异。表层土壤Se含量相对于深层土壤表现出明显的富集特征,富集面积达到76.97%,但以弱富集区域为主,占到总面积的56.93%。土壤有机质、总氮含量与表层土壤Se含量存在较好相关性;与主要重金属以及S的相关性分析表明,其存在着较强的伴生关系,以Cd的伴生关系最为密切。表层土壤Se含量随着海拔和坡度的增加而增加,随着pH的增加而减少。此外,Fe、Al也是影响表层土壤Se含量的重要因素。
Abstract:
      Soil selenium (Se) is seriously deficient in Congqing of southwest China. A Multi-Purpose Regional Geochemical Survey (MPRGS) was performed in the Three Gorges Reservoir Region (Chongqing Section) in order to stimulate the development of native Se-rich agricultural resources. Soil were collected with the sampling density of 1 sample/4 km2 for surface soil and 1 sample/16 km2 for deep soil, respectively, and then the spatial distribution of soil Se and its influential factors were studied. The results showed that the content of Se in surface soil ranged from 0.006 to 5.79 mg/kg with a mean of 0.16 mg/kg, for the total region, about 39.25% and 33.94% were Se deficient and potentially deficient, 25.77% was sufficient, while only 0.16% is rich and poisoning. Se in deep soil ranged from 0.03 to 0.62 mg/kg with a mean of 0.12 mg/kg, and Se deficient and potential deficient accounted for 67.36% and 20.68% in area, respectively. Se content in surface soil varied significantly with soil type, with highest in yellow soil, followed by limestone soil, which were significantly higher than those in paddy soil and purple soil. There were no significant differences in Se contents among different land use types, but Se contents were higher in forestry and construction land types. The obviously Se enrichment in surface soil was found, which accounted to 76.97% of the total area but 56.93% of which was weak enrichment. Se content in surface soil was significantly positively correlated with soil organic matter and total nitrogen contents, altitudes and slope, but significantly negatively correlated with soil pH. The associated relationship was observed between Se and heavy metal contents (As, Cd, Cr, Cu, Hg, Ni, Zn and Pb) in surface soil, particularly of Cd. Furthermore, Fe and Al contents were also important influential factors of Se content in surface soils.
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