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。
Salinity characteristics of shell sand and adjacent ordinary saline soil was investigated in the shell ridge island of the Yellow River Delta.Spatial variability of salinity in the shell ridge was analyzed.Salinity characteristics of the profiles of two types of soil（shell sand and saline soil）with different groundwater depth were measured,the influence of soil types and groundwater depth on soil salinity was analyzed,and soil salinity characteristics was comprehensively evaluated by performing principal component analysis.The result showed that：（1）All salinity indexes,except Ca2＋,showed a gradual increasing trend from surface to lower layer in the shell sand profile（0—120cm）,but Ca2＋showed a gentle decreasing trend in the profile.（2）Content of salt ions had close relationship with groundwater depth in the shell sand profile（0—120cm）,with the fine particle content,water content,salt content,pH value in the seaward profile（groundwater depth 1.5m）being higher than that of the chenier ridge profile（groundwater depth 2.5m）;content of salt ions showed different trends in the two types of profiles,i.e.K＋、Na＋、Cl-、SO42-content of each layer（every 10 cm as a layer）in the seaward profile was obvious higher than the content of the same layer in the chenier ridge profile,but Ca2＋、Mg2＋content of each layer was similar in the two profiles.（3）Correlation analysis of soil salinity indexes showed that,all indexes,except Ca2＋,had significant positive correlations between each other.（4）Results of the principal component analysis showed that the cumulative contribution rate of the first four principal components reached 84.265%,which represented the saline condition,soil Ca2＋content,soil salt content and alkalization characteristic,and K＋content sequentially.Principal component analysis based on the salinitycharacteristic indexes could well classify and sort soil samples in the shell ridge island.
出处
《水土保持学报》
CSCD
北大核心
2016年第6期289-295,共7页
Journal of Soil and Water Conservation
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)
关键词
黄河三角洲
贝壳堤岛
土壤盐分
空间变异性
地下水埋深
the Yellow River Delta
shell ridge island
soil salinity
spatial variability
groundwater depth
