DISTRIBUTION OF SOIL SELENIUM AND ITS RELATIONSHIP WITH SOIL PROPERTIES IN WANJINSHAN OF BAOQING COUNTY, HEILONGJIANG PROVINCE
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摘要:
在宝清县万金山乡耕地区和林区按4个点/km2的密度采集了628件表层土壤样品, 分析包括Se在内的28项化学元素指标. 结果表明: 万金山乡表土中Se元素平均含量为0.28×10-6, 波动范围0.065×10-6~0.51×10-6; 富硒土地占全区3.16%, 足硒土地占92.3%, 硒潜在不足土地占4.3%, 缺硒土地占0.24%, 不存在硒中毒区域. 黑土类型Se元素含量最高, 沼泽土类型Se元素含量最低; Se元素含量在不同土地利用方式下表现为旱田>水田>灌木林地>乔木林地>草地及其他土地. 相关性分析显示: 土壤TOC、土壤黏粒含量对Se元素的富集有促进作用, pH对Se元素含量影响有限, 但对Se元素有效性具有显著影响.
Abstract:The study collects 628 topsoil samples at a density of 4 points/km2 in farm and forest areas of Wanjinshan Township, Baoqing County, to analyze 28 chemical indexes including Se etc. The results show that the average Se content in the topsoil is 0.28×10-6, ranging from 0.065×10-6 to 0.51×10-6, with the Se-rich land accounting for 3.16%, Se-sufficient land 92.3%, potential Se-deficient land 4.3%, Se-deficient land 0.24% and no Se poisoning area. Black soil type has the highest Se content, while swamp soil type has the lowest Se content. The Se contents in different land use patterns are ranked as follows: dry field > paddy field > shrub land > arbor land > grassland and other land. Correlation analysis indicates that soil TOC and clay content promote the enrichment of Se, while pH has a limited influence on Se content but significant effect on Se availability.
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Key words:
- Se content /
- soil type /
- land use pattern /
- soil TOC /
- soil clay /
- Heilongjiang Province
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表 1 万金山乡土壤Se元素含量划分界限值及统计结果
Table 1. Threshold values and statistical results of soil Se content in Wanjinshan area
Se等级 Se含量/10-6 硒效应 面积/km2 占比/% 过剩 > 3.0 硒中毒 0 0 高 0.4~3.0 富硒 5.75 3.16 适中 0.175~0.4 足硒 167.98 92.30 边缘 0.125~0.175 硒潜在不足 7.83 4.30 缺乏 < 0.125 缺硒 0.43 0.24 
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表 2 不同土壤类型Se元素含量参数统计表
Table 2. Parameter statistics of Se content by soil types
土壤类型 样品数 平均值 最大值 最小值 标准差 变异系数 暗棕壤 44 0.23 0.37 0.14 0.05 0.23 白浆土 69 0.30 0.44 0.13 0.08 0.26 草甸土 210 0.28 0.50 0.12 0.07 0.26 黑土 160 0.31 0.51 0.10 0.09 0.29 水稻土 53 0.26 0.45 0.14 0.06 0.24 沼泽土 85 0.22 0.43 0.07 0.06 0.29 含量单位: 10-6.
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表 3 不同土地利用方式Se元素含量参数统计表
Table 3. Parameter statistics of Se content by land use patterns
土地利用 样本数 平均值 最大值 最小值 标准差 变异系数 草地 1 0.14 0.14 0.14 0.00 0.00 灌木林地 4 0.22 0.27 0.15 0.05 0.24 旱地 288 0.30 0.51 0.10 0.09 0.29 其他土地 1 0.14 0.14 0.14 0.00 0.00 乔木林地 23 0.21 0.30 0.13 0.04 0.21 水田 304 0.26 0.50 0.07 0.07 0.28 含量单位: 10-6.
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表 4 表层土壤各种成分与土壤Se相关系数
Table 4. Correlation coefficients of surface soil compositions and soil Se
成分 Al2O3 CaO MgO Na2O SiO2 Fe2O3 TOC SOM CEC 相关系数（r） 0.116** 0.152** 0.340** -0.532** -0.411** 0.210** 0.368** 0.354** 0.540** 成分 K N P 全盐量 水解性氮 速效钾 有效磷 有效硒 As 相关系数（r） -0.242** 0.324** 0.123** 0.304** 0.336** 0.355** 0.172** 0.779** 0.410** 成分 Cd Cr Cu Hg Mn Ni Pb Zn pH 相关系数（r） 0.066 0.202** 0.461** 0.115** 0.059 0.265** 0.285** 0.190** 0.197** **为p < 0.01, 相关性显著.
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