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Characteristics and influencing factors of Se content in the farmland system in Bailang County, Tibet, China |
Duo-Ji-Wei-Se ( ), Ci-Ren-Wang-Dui , Ni-Ma-Luo-Zhuo , ZHOU Peng, Ni-Ma-Ci-Ren |
Geothermal Geological Brigade, Tibet Bureau of Geology and Minerals Exploration, Lhasa 850032, China |
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Abstract The development of Se-rich land has been carried out in many regions of China, achieving remarkable results. However, no Se-rich land or crop has been reported in Tibet. This study analyzed the characteristics and influencing factors of the Se content in the soils and crops of the key arable land areas in Bailang County, Tibet, aiming to lend support to the development and utilization of Se-rich land in the Qinghai-Tibet Plateau. The results are as follows: The soils in the study area have a Se content of (0.05~0.76)×10-6, which is higher than the background value of soils in Tibet (0.15 ×10-6); 76.83% of the land in the study area has sufficient Se, and land in the study area with a Se content of greater than 0.3 ×10-6 covers an area of 45.43 km2, as determined according to the standard threshold of Se content in alkaline soils (w(Se)≥0.3 ×10-6). Further investigation shows that highland barley seeds have a Se content of (0.017~0.17)×10-6 (average: 0.063 ×10-6) and rapeseeds have a Se content of (0.043~0.14)×10-6 (average: 0.078 ×10-6) in the distribution area of Se-rich soils. As indicated by the root soil results of the zones with Se-rich soils, the Nieru Group controls the source of Se in soils, and Se and effective Se content in the soils are significantly positively correlated with N, P, alkali-hydrolyzable nitrogen, and rapid available phosphorus but is significantly negatively correlated with pH. These results indicate that the behavior of Se is significantly affected by a large number of nutrient elements in the soils and pH. Overall, the distribution areas of Se-rich soils in Bailang County have high soil environmental quality, crops with a high Se content, and great potential for the development of Se-rich plateau characteristic agricultural products.
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Received: 19 April 2022
Published: 11 October 2023
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Bitmap of the working range and sampling points in the study area
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指标 | 样品数 | 最小值/10-6 | 最大值/10-6 | 算术均值/10-6 | 中位数/10-6 | 算术标准差/10-6 | 变异系数 | 表层土壤Se | 1853 | 0.05 | 0.76 | 0.24 | 0.24 | 0.08 | 0.32 | 根系土壤Se | 30 | 0.23 | 0.69 | 0.35 | 0.33 | 0.08 | 0.24 | 西藏土壤Se[7] | 205 | 0.04 | 0.37 | 0.15 | 0.14 | | 0.48 | 中国表层土壤Se[12-13] | 376743 | 0 | 49.60 | 0.26 | 0.21 | 0.22 | 0.80 |
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Selenium contents of surface soils in the study area
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Distribution map of selenium-rich soil in the surface soil of the study area
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Distributional property of selenium content in selenium-rich soil area plant
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地层 | 算术均 值/10-6 | 中位 数/10-6 | 标准差/ 10-6 | 最大 值/10-6 | 最小 值/10-6 | 变异 系数 | 昂仁组 (K1-2a) | 0.20 | 0.22 | 0.03 | 0.22 | 0.14 | 0.17 | 甲不拉组 (K1j) | 0.22 | 0.22 | 0.01 | 0.24 | 0.21 | 0.06 | 宗卓组 (K2z) | 0.20 | 0.18 | 0.08 | 0.44 | 0.14 | 0.40 | 涅如组 (T3n) | 0.32 | 0.32 | 0.07 | 0.50 | 0.17 | 0.20 | 朗杰学群 (T3l) | 0.20 | 0.21 | 0.04 | 0.24 | 0.16 | 0.19 | 穷果群 (T1-2q) | 0.20 | 0.21 | 0.03 | 0.24 | 0.16 | 0.15 |
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Characteristics of selenium content in surface soils of different geological bodies distribution areas
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Relationship between total Se and available Se of root soil and soil pH and organic matter indexs
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指标 | N | P | Se | Zn | K2O | 有机质 | Se | 0.371* | 0.431* | 1 | 0.370* | 0.397* | 0.294 | 有效硒 | 0.462* | 0.645** | 0.822** | -0.007 | 0.283 | 0.416* | 指标 | pH | 碱解氮 | F | 有效硫 | 速效磷 | 有效硒 | Se | -0.542** | 0.237 | 0.467** | 0.729** | 0.341 | 0.822** | 有效硒 | -0.428* | 0.493** | 0.167 | 0.684** | 0.445* | 1 |
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Correlation coefficients between selenium and other indicators
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指标 | 水溶态 | 离子交换态 | 碳酸盐结合态 | 腐殖酸结合态 | 铁锰结合态 | 强有机结合态 | 残渣态 | 全硒 | 水溶态 | 1 | | | | | | | | 离子交换态 | 0.986** | 1 | | | | | | | 碳酸盐结合态 | 0.856* | 0.777 | 1 | | | | | | 腐殖酸结合态 | 0.839* | 0.783 | 0.719 | 1 | | | | | 铁锰结合态 | 0.594 | 0.651 | 0.289 | 0.618 | 1 | | | | 强有机结合态 | 0.192 | 0.103 | 0.189 | 0.352 | -0.394 | 1 | | | 残渣态 | 0.933** | 0.949** | 0.804 | 0.731 | 0.616 | -0.056 | | | 全硒 | 0.941** | 0.905* | 0.801 | 0.927** | 0.487 | 0.424 | 0.856* | 1 |
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Correlation analysis coefficients between whole soil selenium and each form of selenium
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