黄河三角洲贝壳堤岛土壤盐分空间分异特征

发布时间：2018-11-11 00:20

【摘要】：对黄河三角洲贝壳堤岛贝壳砂基质和相邻滨海盐土的盐分特征进行调查研究,系统分析贝壳堤岛土壤盐分的空间异质性。选择不同地下水埋深梯度下2种土壤类型进行剖面盐分特征测定,比较研究土壤类型及地下水埋深对土壤盐分特征的影响,并应用主成分分析法对土壤盐分特征进行综合评价。结果表明:(1)除Ca2+外,贝壳砂基质剖面中其余盐分特征指标由表层至底层均呈现逐渐增高的趋势,Ca2+含量由上至下则呈现缓慢降低的趋势;(2)贝壳砂基质剖面盐分含量与地下水埋深密切相关,近海侧剖面(地下水埋深1.5m)细颗粒含量、含水量、含盐量及pH值均高于滩脊剖面(地下水埋深2.5m)对应各层次;而各盐分离子中,近海侧剖面各层K+、Na+、Cl-、SO42-含量明显高于滩脊剖面对应各层次;而Ca2+、Mg2+则不同,其近海侧剖面与滩脊剖面对应各层次含量均比较接近;(3)贝壳堤岛土壤样品盐分特征指标相关分析表明,除Ca2+外,其余各指标之间多存在显著或极显著正相关关系;(4)贝壳堤岛土壤样品盐分特征指标的主成分分析表明,前4个主成分因子累计贡献率为84.265%,分别依次可以理解为土壤的盐化状况因子、土壤Ca2+含量因子、土壤含盐量及碱化特征因子、土壤K+含量因子;主成分得分可以很好的将各土壤样品进行分类和排序。
[Abstract]:The salt characteristics of shell sand matrix and adjacent coastal saline soil in the Yellow River Delta were investigated, and the spatial heterogeneity of salt content in shell island soil was systematically analyzed. Two soil types with different groundwater depth gradient were selected to measure the salt characteristics of soil profile. The effects of soil type and groundwater depth on soil salt characteristics were compared and evaluated comprehensively by principal component analysis (PCA). The results are as follows: (1) except for Ca2, the salt content in shell sand matrix profile increased gradually from top to bottom, and Ca2 content decreased slowly from top to bottom; (2) the salt content in the base section of shell sand is closely related to the depth of groundwater, and the content of fine particles and water content in the offshore profile (1.5 m of groundwater depth); The salt content and pH value are higher than those of the beach ridge section (groundwater depth 2.5 m). Among the salt ions, the K, Na, Cl-,SO42- content of each layer in the offshore profile is obviously higher than that in the beach ridge section, while the content of Ca2 and Mg2 in the offshore side profile is similar to that in the beach ridge section. (3) the correlation analysis of salt content in the soil samples of the shell dike island showed that there was significant or extremely significant positive correlation between the other indexes except Ca2; (4) the principal component analysis showed that the accumulative contribution rate of the first four principal factors was 84.265, which could be understood as the salinization condition factor and the Ca2 content factor of the soil respectively. Soil salt content and alkali characteristic factor, soil K content factor; Principal component scores can be used to classify and sort soil samples.
【作者单位】：滨州学院山东省黄河三角洲生态环境重点实验室;山东农业大学林学院;
【基金】：国家自然科学基金项目(41401100) 山东省科技发展计划项目(2014GSF117022) 山东省自然科学基金项目(ZR2013CQ007) 山东省高等学校科技计划项目(J16LH53) 城市与区域生态国家重点实验室开放基金项目(SKLURE2015-2-4)
【分类号】：S153.6

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