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Speciation of selenium in typical meadow soils in Tumed Left Banner, Inner Mongolia, China |
LIU Jin-Bao( ), XU Hong-Guo, YUAN Hong-Wei, ZHANG Xiao-Feng |
Geological Survey and Research Institute of Inner Mongolia, Hohhot 010020, China |
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Abstract This study determined the speciation, available content, and physicochemical properties of selenium in soils using samples of topsoil and soil column profiles from Tabusai Township, Tumed Left Banner, Inner Mongolia, China. Accordingly, this study investigated the compositions of the speciation and available content of soil selenium, as well as their influencing factors. The results indicate that: (1) the major forms of selenium in topsoil include humic acid bound, strong organic bound, and residue forms; (2) the concentration of in the humic acid bound selenium correlates positively with the cation exchange capacity (CEC) and the concentrations of organic matter, phosphorus, and potassium; the total selenium concentration correlates positively with the concentrations of humic acid bound selenium, Fe-Mn oxide bound selenium, strong organic bound selenium, and residue selenium, all of which exhibit promotion effects; (3) the sulfur concentration correlates negatively with the concentration of water-soluble selenium, demonstrating an inhibitory effect; (4) the concentrations of selenium in various forms tend to decrease from the surface layer to the deep layer; (5) the concentration of bioavailable selenium correlates positively with the total selenium concentration, organic-bound selenium, and water-soluble selenium and correlates negatively with the sulfur concentration. The soils in the study area, featuring a high concentration of water-soluble selenium and fairly high bioavailability, are suitable for planting selenium-rich agricultural products.
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Received: 08 August 2022
Published: 26 February 2024
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Sampling points and land type of study area
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指标 | 规范要求 | 分析方法 | 检出限 | | 指标 | 规范要求 | 分析方法 | 检出限 | 水溶态硒 | 0.005 | AFS | 0.005 | | 有效硒 | | AFS | 0.005 | 离子交换态硒 | 0.010 | AFS | 0.010 | | 农产品硒 | 0.005 | AFS | 0.005 | 碳酸盐结合态硒 | 0.005 | AFS | 0.005 | | 根系土硒 | 0.010 | AFS | 0.010 | 腐殖酸结合态硒 | 0.005 | AFS | 0.005 | | pH | 0.1* | ISE | 0.1* | 铁锰氧化物结合态硒 | 0.010 | AFS | 0.010 | | 有机质 | 0.1** | VOL | 0.02** | 强有机结合态硒 | 0.005 | AFS | 0.005 | | CEC | 2.5*** | VOL | 2.5*** | 残渣态硒 | 0.010 | AFS | 0.010 | | | | | |
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Analysis methods and detection limits of selenium forms and physicochemical indexes in soil
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硒形态 | 最小值/10-6 | 最大值/10-6 | 算术平均值/10-6 | 标准离差/10-6 | 变异系数 | 水溶态硒 | 0.0073 | 0.0143 | 0.0096 | 0.0018 | 0.1920 | 离子交换态硒 | 0.0040 | 0.0057 | 0.0049 | 0.0005 | 0.1009 | 碳酸盐结合态硒 | 0.0037 | 0.0065 | 0.0055 | 0.0008 | 0.1503 | 腐殖酸结合态硒 | 0.0610 | 0.1090 | 0.0824 | 0.0171 | 0.2081 | 铁锰氧化物结合态硒 | 0.0054 | 0.0109 | 0.0071 | 0.0014 | 0.2024 | 强有机结合态硒 | 0.0780 | 0.1550 | 0.1110 | 0.0201 | 0.1809 | 残渣态硒 | 0.0873 | 0.2216 | 0.1343 | 0.0315 | 0.2349 | 有效硒 | 0.0102 | 0.0190 | 0.0136 | 0.0031 | 0.2281 |
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Statistics content of each form of selenium and effective selenium in the surface soil(n=14)
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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 | 铁锰氧化 物结合态 | 强有机 结合态 | 残渣态 | 可溶态 | 有机态 | 难溶态 | 三项 累加和 | 最大值 | 3.86 | 2.03 | 2.38 | 28.01 | 2.38 | 36.21 | 44.98 | 7.82 | 60.03 | 73.55 | 93.40 | 最小值 | 1.88 | 0.97 | 1.10 | 19.08 | 1.67 | 26.59 | 33.20 | 4.58 | 48.10 | 65.21 | 90.00 | 平均值 | 2.76 | 1.44 | 1.61 | 23.27 | 2.01 | 31.31 | 37.60 | 5.80 | 54.58 | 68.92 | 92.19 |
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Proportion of each form of selenium in the surface soil %
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硒形态 | ZH6 | ZH10 | 平均值/10-6 | 范围/10-6 | 所占比例/% | 平均值/10-6 | 范围/10-6 | 所占比例/% | 水溶态 | 0.0068 | 0.0049~0.0092 | 2.76 | 0.0084 | 0.0048~0.0143 | 3.30 | 离子交换态 | 0.0048 | 0.0040~0.0061 | 1.96 | 0.0047 | 0.0037~0.0106 | 1.85 | 碳酸盐结合态 | 0.0056 | 0.0039~0.0066 | 2.26 | 0.0053 | 0.0047~0.0061 | 2.09 | 腐殖酸结合态 | 0.0536 | 0.0270~0.0850 | 21.66 | 0.0613 | 0.0340~0.1090 | 23.96 | 铁锰氧化物结合态 | 0.0050 | 0.0035~0.0084 | 2.00 | 0.0046 | 0.0025~0.0082 | 1.78 | 强有机结合态 | 0.0879 | 0.0310~0.1550 | 35.49 | 0.0783 | 0.0380~0.1280 | 30.61 | 残渣态 | 0.0839 | 0.0413~0.1598 | 33.88 | 0.0931 | 0.0318~0.1679 | 36.41 | 各形态硒含量之和 | 0.2476 | 0.1179~0.4281 | 100.00 | 0.2556 | 0.1234~0.4352 | 100.00 |
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Selenium content and proportion of each form in vertical soil profiles(n=16)
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Characteristic comparison of different selenium forms in the vertical soil section CP22
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Distribution of selenium contents of various forms in the vertical soil section CP22
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指标 | 水溶态硒 | 离子 交换态硒 | 碳酸盐 结合态硒 | 腐殖酸 结合态硒 | 铁锰氧化物 结合态硒 | 强有机 结合态硒 | 残渣态硒 | 有效硒 | 0.9341** | 0.1905 | -0.0719 | 0.9701** | 0.6667 | 0.9524** | 0.7619* | 全量硒 | 0.9461** | 0.0476 | -0.0958 | 0.9940** | 0.6667 | 1.0000** | 0.8810** | 有机质 | 0.8253* | 0.3473 | 0.0000 | 0.8916** | 0.4671 | 0.8743** | 0.6108 | pH值 | -0.9940** | -0.1190 | -0.0120 | -0.9461** | -0.7381* | -0.9524** | -0.7619* | CEC | 0.1557 | 0.1429 | -0.1198 | 0.2156 | -0.2857 | 0.1905 | 0.0238 | P | 0.9102** | 0.1667 | -0.2275 | 0.9940** | 0.6905 | 0.9762** | 0.8095* | K | 0.9515** | 0.1205 | -0.0849 | 0.9940** | 0.6747 | 0.9880** | 0.8314* | S | 0.7545* | 0.0238 | -0.2275 | 0.9102** | 0.5952 | 0.8810** | 0.8095* |
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Statistical of Spearman's rank correlation coefficients (r) between soil physicochemical indicators, effective selenium, total selenium and each form of selenium in the vertical soil section CP22
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指标 | 水溶态硒 | 离子 交换态硒 | 碳酸盐 结合态硒 | 腐殖酸 结合态硒 | 铁锰氧化物 结合态硒 | 强有机 结合态硒 | 残渣态硒 | 全量硒 | 0.4565 | 0.0330 | -0.0352 | 0.8405** | 0.8490** | 0.9493** | 0.7877** | 有机质 | 0.1080 | 0.1716 | -0.3212 | 0.7107** | 0.5006 | 0.4273 | 0.4158 | CEC | 0.0862 | 0.0540 | -0.3252 | 0.6108* | 0.4641 | 0.2627 | 0.2514 | pH | 0.4823 | -0.4141 | -0.0220 | -0.1850 | 0.0077 | -0.0584 | -0.3612 | P | 0.4724 | 0.1167 | -0.2797 | 0.6806** | 0.3742 | 0.4498 | 0.3216 | S | -0.6615** | -0.1342 | 0.1276 | -0.2992 | -0.1808 | -0.4053 | -0.2772 | K | 0.0796 | -0.0993 | -0.2693 | 0.5464* | 0.4237 | 0.2232 | 0.2351 | 黏土矿物 | 0.1610 | -0.1034 | -0.2992 | 0.4224 | -0.0243 | 0.1718 | 0.1628 | 有效硒 | 0.5254* | -0.0859 | -0.1123 | 0.4648 | 0.3322 | 0.5865* | 0.5198 |
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Statistical of Spearman's rank correlation coefficients (r) between soil physicochemical indicators, effective selenium and each form of selenium in soils
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指标 | 全量硒 | 黏土矿物 | 有机质 | pH | CEC | P | S | K | 有效硒 | 0.6161* | 0.4129 | 0.3378 | 0.0396 | 0.0055 | 0.2511 | -0.5853* | 0.0916 |
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Statistical of Spearman's rank correlation coefficient (r) between soil physicochemical indicators and effective selenium in soils
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指标 | 水溶态硒 | 离子 交换态硒 | 碳酸盐态硒 | 腐殖酸 结合态硒 | 铁锰氧化物 结合态硒 | 强有机 结合态硒 | 残渣态硒 | 有效硒 | 玉米籽粒硒 | 0.7289* | 0.0361 | 0.0719 | 0.0361 | -0.1818 | -0.0843 | 0.0838 | 0.8024* |
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Statistical of Spearman's rank correlation coefficient (r) between soil selenium form, effective state and selenium content of maize seeds
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