| 韩笑,周越,吴文良,孟凡乔.富硒土壤硒含量及其与土壤理化性状的关系——以江西丰城为例[J].农业环境科学学报,2018,37(6):1177-1183. |
| 富硒土壤硒含量及其与土壤理化性状的关系——以江西丰城为例 |
| Selenium contents of farmland soils and their relationship with main soil properties in Fengcheng, Jiangxi |
| 投稿时间：2017-10-12 |
| DOI：10.11654/jaes.2017-1375 |
| 中文关键词: 土壤全硒 土地利用方式 江西 丰城 土壤理化性质 |
| 英文关键词: soil selenium land use Jiangxi Fengcheng soil physic-chemical properties |
| 基金项目:公益性行业（农业）科研专项项目（201303106） |
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| 中文摘要: |
| 为了解富硒土壤的硒含量及其分布特征，明确土壤硒与主要土壤性状指标的关系，选择江西丰城地区不同硒水平的水田和旱作农田，于2014年9月选取了14个村落于作物收获后布设土壤剖面采样点。在0~100 cm的土壤剖面进行分层（20 cm）取样，测定土壤全硒含量及主要理化性状。结果表明，丰城地区农田土壤（0~20 cm）全硒平均含量（算术平均值）为0.49 mg·kg-1，41.2%的农田土壤高于0.4 mg·kg-1，99%高于0.125 mg·kg-1。1 m剖面中土壤硒含量在0~20 cm最高，硒含量随着土壤深度的增加而逐渐降低，且在60 cm以下基本保持不变。富硒条件下，水田土壤硒含量在0~40 cm土层上显著高于旱地土壤；非富硒条件下，二者的全硒含量在1 m土体上无显著差异。土壤有机质含量对土壤全硒含量有决定性影响，而黏粒仅对水田土壤硒有显著影响。pH对土壤全硒含量呈现抑制作用，而土壤总铁、总铝和阳离子交换量对土壤全硒呈现富集效应。研究表明，在富硒地区，水田比旱地更有利于土壤硒的积累，提高土壤肥力水平对增加土壤硒含量有显著作用。 |
| 英文摘要: |
| Fengcheng City, one of China's most important farming regions, contains soil that is rich in selenium(Se). This study analyzes the Se contents and Se distribution within 0~100 cm profiles under different land use(paddy and upland), as well as the relationship between Se contents and the physio-chemical properties of the soil. The results showed that the average soil Se content was 0.49 mg·kg-1(arithmetic mean) for farmland soils of Fengcheng; among which 41.2% and 99% soils had Se contents higher than 0.4 and 0.125 mg·kg-1, respectively. Se was accumulated in the surface layer of farmland soils and its content was stable and lower in the 60~100 cm layer. In Se-rich soils, soils for paddy use had a significantly higher Se content than upland soils in the 0~40 cm layer. In the non-Se-rich soils, no significant differences in Se content were observed between paddy and upland soils across the 0~100 cm profile. Across the 0~100 cm profile, soil organic carbon had a determining effect on paddy and upland soil Se content, while soil clay content only exhibited its positive effect on soil Se content for paddy use. Soil pH tended to reduce the soil Se content and other soil properties including total Fe, total Al and CEC showed the effects of increasing soil Se content. The results of our study could provide technical support for rational management and utilization of Se-rich soils in Fengcheng. |
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