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| 重庆农田土壤硫分布特征及其影响因素 |
| Distribution characteristics and influencing factors of soil sulphur in Chongqing farmlands |
| 投稿时间：2018-11-06 |
| DOI：10.13254/j.jare.2018.0306 |
| 中文关键词: 重庆市，全硫，分布特征，剖面深度，土壤类型，地形，土地利用方式 |
| 英文关键词: Chongqing, total sulfur, distribution characteristics, profile depth, soil types, topography, land use patterns |
| 基金项目:国家自然科学基金项目（41371211） |
| 作者 | 单位 | E-mail | | 罗曼琳 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 窦添元 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 向秋洁 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 胡翔宇 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 木志坚 | 西南大学资源环境学院, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716
三峡库区生态环境教育部重点实验室, 重庆 400715 | muzj@swu.edu |
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| 中文摘要: |
| 为研究不同环境要素作用下重庆农田土壤硫分布特征及其与环境因素的关系，结合野外调查和室内分析，研究了重庆农田土壤全硫的分布特征及其与土壤剖面深度、土壤类型、地形、土地利用方式、土壤pH和有机质之间的关系。结果表明，表层土壤全硫的平均值为262 mg·kg-1，处于我国土壤硫平均水平，高于作物缺硫临界值150 mg·kg-1。全硫含量空间分布在水平方向上呈现渝西、渝东北大于渝东南、渝中的趋势；在垂直方向上，呈现出自上而下逐渐降低的分布特征。全硫含量在不同土壤类型中表现为黄棕壤土最高、潮土最低，在不同地形条件下表现为中山最高、台地最低，在不同土地利用方式下则表现为未开垦农地最高、旱地最低。土壤全硫含量与pH对数呈显著负相关（P<0.01），与有机质含量对数呈显著正相关（P<0.01）。多元线性逐步回归分析表明，土壤类型和有机质含量是影响土壤全硫含量分布的主要因素，pH、地形、土地利用方式是次要因素。 |
| 英文摘要: |
| Exploring the distribution characteristics of soil sulfur under different environments and its relationship with environmental factors is important for the comprehensive and accurate assessment of soil sulfur status and the soil sulfur cycle in Chongqing farmlands. In this study, we characterized the relationship of total sulfur in Chongqing's farmland soils with soil depth, soil type, topography, land use pattern, soil pH and organic matter using field investigations and indoor analysis. We found that the total sulfur content of surface soil was an average of 262 mg·kg-1, which was the average level of soil sulfur in China. It was higher than the critical value of crop sulfur deficiency of 150 mg·kg-1. In a horizontal direction, the total sulfur content of west and northeast Chongqing was greater than that of the southeast and the middle of Chongqing. In a vertical direction, sulfur was a decreasing feature from top to bottom. The sulfur content reached the highest levels in yellow brown soil and the lowest levels in tidal soil. Under different terrain, the total sulfur content was the highest in the middle mountains, and the lowest in the terraces. In terms of different land use modes, the total sulfur content was highest in uncultivated agricultural land and lowest in dry land. There was a significant negative correlation (P<0.01)between total soil sulfur content and the pH logarithm, and a significant positive correlation (P<0.01)with the logarithm of organic matter content. A multivariate linear stepwise regression analysis showed that soil type and organic matter content were the primary factors affecting the distribution of total sulfur content in soil while pH, topography and land use patterns were the secondary factors. |
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