| 滨海废弃盐田复垦区土壤空间变异及其分区管理研究 |
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| 引用本文： | 刘文全,卢芳,徐兴永,曹建荣,于洪军.滨海废弃盐田复垦区土壤空间变异及其分区管理研究[J].土壤通报,2022,53(4):777-786. |
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| 作者姓名： | 刘文全 卢芳 徐兴永 曹建荣 于洪军 |
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| 作者单位： | 1.自然资源部海岸带科学与综合管理重点实验室，山东 青岛 266061 |
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| 基金项目： | 国家自然科学基金-山东省联合基金项目（U1806212）资助 |
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| 摘 要： | 目的 针对山东省莱州湾南岸废弃盐田复垦区盐分高、土壤养分空间差异性大、管理粗放和效益低等问题，研究田间管理分区的精准划分方法，便于农户差异化施肥管理，提高盐渍土改良水平。 方法 以废弃盐田复垦区典型地块为研究对象，运用传统统计学、主成分分析和模糊c-均值分类等方法对研究区进行管理分区的划分，并评价管理分区划分的适宜性和有效性。 结果 研究区土壤含盐量均值达到1.73 g kg?1，处于轻度盐渍化水平；土壤有机质、全氮、速效氮、速效钾和速效磷等含量均处于较低的水平；全磷和阳离子交换量处于中等水平；全钾和pH值达到了较高的水平。全钾和pH值的变异系数 < 0.1，属于弱变异，其他土壤属性属于中等变异强度。土壤各属性在空间分布上差异性大。主成分分析结果表明，将10个土壤属性分组为统计因子可划分成3个主成分。模糊c-均值分类结果表明，研究区可划分为2个管理分区，不同管理分区中土壤含盐量、有机质、土壤养分等属性存在显著差异。 结论 可以利用不同土壤属性借助模糊c-均值分类方法来确定废弃盐田复垦区农田的管理分区。
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| 关 键 词： | 废弃盐田 地统计学 空间变异 主成分分析 模糊c-均值聚类 管理分区 |
| 收稿时间： | 2021-07-21 |
Spatial Variability and Zoning Management of Reclaimed Area of Abandoned Salt Pan in Coast |
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| Institution: | 1.Key Laboratory of Coastal Science and Integrated Management, MNR, Qingdao 266061, China2.Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, China3.Shandong University of Science and Technology, College of Ocean Science and Engineering, Qingdao 266590, China4.Fourth Institute of Oceanography, Ministry of Natural Resources, Beihai 536000, China5.College of Environment and Planning, Liaocheng University, Liaocheng 252059, China |
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| Abstract: | Objective Considering the problems of high salinity, large spatial difference of soil nutrients, extensive management and low benefit in the reclamation area of abandoned salt pan on the South Bank of Laizhou Bay, the precise delineation method of management zones is performed, so as to facilitate the differential fertilization management of farmers and improve the improvement level of saline soil. Method The typical plot of reclamation area of abandoned salt pan was taken as the research region. Site-specific management zones were identified based upon the traditional statistics, principal component analysis and fuzzy c-means classification, and the appropriateness and availability of management zones were evaluated. Result The average soil salt content in the study area reached 1.73 g kg?1, which was at the level of mild salinization. The contents of soil organic matter, total nitrogen, alkali hydrolysable nitrogen, available potassium and available phosphorus were at a low level. Total phosphorus and cation exchange capacity were at a moderate level. Total potassium and pH value reached a high level. The coefficient of variation of total potassium and pH value was less than 0.1, which was a weak variation. The other soil properties belonged to medium variation. The results of principal component analysis showed that the 10 soil attributes could be divided into three principal components. There were great differences in the spatial distribution of soil attributes. The cluster analysis results showed that the study area can be divided into two management zones, and significant differences in soil salt content, organic matter, soil nutrients and other attributes were observed in these two management zones. Conclusion The management zones of farmland in the reclaimed area of abandoned salt pan can be determined by fuzzy c-means classification using different soil attributes. The research results can provide scientific basis and theoretical guidance for the field management of the reclamation area of abandoned salt pan on the southern coast of Laizhou Bay. |
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