黄河三角洲县域尺度的盐渍化土壤化学参数特征研究

发布时间：2018-04-21 00:27

  本文选题：垦利县 + 土壤盐渍化学参数　； 参考：《土壤》2017年05期

【摘要】：地处黄河三角洲的山东省垦利县土地资源丰富、土地利用率低,但区域内土壤盐渍化程度高,理化性质空间变异大,严重制约土地的有效开发利用。本研究通过在县域范围内进行面上布点采样及实验室化学分析,系统研究了垦利县县域尺度0~20及20~40 cm土层土壤盐分及其化学参数间的通径关系及土壤盐渍化的空间分异特征。结果表明:调查期间的垦利县0~20 cm土层土壤盐分高于20~40 cm土层,除pH外两层土壤各项化学参数的变异系数都在中等变异以上;影响0~20及20~40 cm两层土壤盐分(EC5:1)的直接土壤化学参数为Cl~ 、Na~+、Ca~(2+),4个参数有非常好的线性回归曲线;0~20 cm土层土壤沿海岸线表现出强烈的盐化和钠质化现象,而20~40 cm土层整体上盐分和钠吸附比均小于表层土壤,盐化和钠质化较弱;土壤p H则表现为20~40 cm土层高于0~20 cm土层,其碱化现象较为明显。研究结果为垦利县土壤盐分研究提供可靠的基础数据及经验公式,同时可为垦利县土壤盐渍化治理提供科学依据及理论指导。
[Abstract]:Located in the Yellow River Delta, Kenli County of Shandong Province is rich in land resources and low in land use ratio, but its soil salinization is high and its physical and chemical properties are of great spatial variation, which seriously restricts the effective development and utilization of land. In this study, the path relationship between soil salinity and its chemical parameters and the spatial differentiation characteristics of soil salinization were systematically studied by sampling points on the surface and chemical analysis in the county area of Kenli County on the scale of 0 ~ 20 cm and 20 ~ 40 cm soil layer. The results showed that the salt content in the soil layer of 0 ~ 20 cm was higher than that of 20 ~ 40 cm soil layer in Kenli County during the investigation period, and the coefficient of variation of the chemical parameters of the two layers except pH was more than moderate variation. The direct soil chemical parameters affecting the soil salt content of the two layers of 0 ~ (20) and 20 ~ (40 cm) are Cl ~ (2 +) Na ~ (2 +) ~ ((1)), and the four parameters have a very good linear regression curve (0 ~ (20) cm soil layer) showing strong salinization and natrium along the shoreline. The salt and sodium adsorption ratios in the soil layer of 20 ~ 40 cm were lower than those in the surface soil layer, but the salinization and sodium content of the soil layer were weak, while the pH of the soil layer of 20 ~ 40 cm soil layer was higher than that of the 0 ~ 20 cm soil layer, and the alkalization phenomenon was more obvious than that of the soil layer of 20 ~ 40 cm soil layer. The results provide reliable basic data and empirical formulas for soil salinity research in Kenli County, and provide scientific basis and theoretical guidance for soil salinization management in Kenli County.
【作者单位】： 中国科学院南京地理与湖泊研究所;中国科学院海岸带环境过程与生态修复重点实验室;长安大学环境科学与工程学院;中国科学院南京土壤研究所;天津泰达绿化集团有限公司;
【基金】：国家重点研发计划课题(2016YFD02003003) 东营市重点研发计划项目(2016YF17) 山东省重点研发计划项目(2017 CXGC0316) 江苏省科技计划项目(BZ2014005,BE2014739)资助
【分类号】：S156.4
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本文编号：1780142