近20年间黄淮海平原典型区盐渍土性质的对比分析

２０００年通过随机选取１９８０年的８８个盐渍土样点中的３３个样点进行对比调查，研究黄淮海冲积平原区曲周县盐渍土壤的全盐量、ｐＨ、有机质、全氮和有效养分的动态变化以及地下水埋深的变动趋势．结果表明，该县耕地盐渍化和脱盐化作用皆存在，原非盐渍土有盐渍化趋势，轻度盐化土有盐渍化加重的趋势，中度、重度盐化上和内陆盐上则经长期改良治理后脱盐化趋势明显．该区盐渍土有机质、全氮和碱解氮含量均有明显提高，有效磷含量有增有减，有效钾含量则明显降低．对区域土壤盐渍化与脱盐化作用影响较大的地下水位明显降低．

Comparitive Study on the Properties of Saline Soils in the Typical Region of Huang-Huai-Hai Plain in Recent Twenty Years

The dynamics of soil total salt, organic matter, total nitrogen, available nutrients contents, level of groundwater and pH values were studied in Quzhou County, Huang - Huai - Hai Plain between 1980 and 2000, based on the comparative analysis at 33 points of 88 points sampled in 1980. The re- sults indicated that both salinization and desalinization were proceeding in the soils. The salinization tendency of the former non - saline soil occurred and that of the light saline soil became heavily. How- ever, the former middle, heavy saline soils and inland saline soil tended to desalt significantly after long term improvement. The results showed that their organic matter, total nitrogen and available nitrogen increased obviously. Available phosphorus contents of some sampling points decreased and others in- creased and that of available potassium decreased obviously. The groundwater table had domain influ- ence on the processes of salinization and desalinization.