周殷竹, 刘义, 王彪, 周金龙, 王思源. 青海省囊谦县农耕区土壤硒的富集因素[J]. 地质通报, 2020, 39(12): 1952-1959.
    引用本文: 周殷竹, 刘义, 王彪, 周金龙, 王思源. 青海省囊谦县农耕区土壤硒的富集因素[J]. 地质通报, 2020, 39(12): 1952-1959.
    ZHOU Yinzhu, LIU Yi, WANG Biao, ZHOU Jinlong, WANG Siyuan. Influence factors of soil selenium in cultivated area of Nangqian County, Qinghai Province[J]. Geological Bulletin of China, 2020, 39(12): 1952-1959.
    Citation: ZHOU Yinzhu, LIU Yi, WANG Biao, ZHOU Jinlong, WANG Siyuan. Influence factors of soil selenium in cultivated area of Nangqian County, Qinghai Province[J]. Geological Bulletin of China, 2020, 39(12): 1952-1959.

    青海省囊谦县农耕区土壤硒的富集因素

    Influence factors of soil selenium in cultivated area of Nangqian County, Qinghai Province

    • 摘要: 土壤质量地球化学调查结果显示,青海省囊谦县城周边农耕区存在较大范围的足量(0.15 < Se≤0.30 mg/kg)-富硒(Se>0.30 mg/kg)土地。足-富硒土壤的分布对成土母质具有较好的继承性。同时,土壤Se含量还受地球化学环境、土壤类型与质地、土壤性质等自然条件综合影响。其中,富硒土的土壤类型主要为草甸土(Se=0.08~0.69 mg/kg,平均值0.26 mg/kg)和栗钙土(Se=0.20~0.42 mg/kg,平均值0.32 mg/kg)。土壤Se含量通常随土壤pH值的增加而降低。硒更易富集于土壤壤质化程度较高、粒度较细的红粘土和黑粘土中。富含有机质(12.1~98.6 g/kg,平均值30.8 g/kg)和铁铝氧化物(铁氧化物含量2.86%~6.34%,平均值4.34%,铝氧化物含量10.07%~17.87%,平均值13.59%)的土壤有利于土壤硒的富集。

       

      Abstract: The results of geochemical evaluation of soil quality show that there is large area of selenium-rich (Se>0.30 mg/kg)sufficient (0.15 < Se≤0.30 mg/kg) land (65.25 km2) in cultivated area around Nangqian County.Selenium-rich/sufficient soil shows a good inheritance of parent material.Meanwhile, soil selenium content is affected by natural factors including geochemistry, environment for soil formation, soil type/texture and soil properties.Meadow soil (soil Se content ranging between 0.08 mg/kg and 0.69 mg/kg with an average of 0.26 mg/kg) and chestnut soil (soil Se content ranging between 0.20 mg/kg and 0.42 mg/kg with an average of 0.32 mg/kg) are the main selenium-rich soil types.Soil Se content generally shows an opposite trend of pH.Selenium is more liable to be enriched in red clay and black clay with higher loamification level and finer particles.Higher organic matter (ranging between 12.1 g/kg and 98.6 g/kg with an average of 30.8 g/kg) and iron-aluminum oxides content (from 2.86% to 6.34% with an average of 4.34% and from 10.07% to 17.87% with an average of 13.59%, respectively) are advantageous to soil selenium enrichment as well.

       

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