黑龙江省三江平原的苏打盐渍土

我国黑龙江省的三江平原，部分地区分布着小面积的苏打　盐渍化土壤，含盐量低，但是ｐＨ值高，碱化度大，具有着盐化与碱化同时进行的双重特性．土壤潜水埋藏较浅，属低矿化的ＨＣＯ３－Ｎａ型水，通常因土体下部存在铁盘层相隔而与其深　层地下水缺乏联系，以致在其形成过程方面有着某种特殊性．在改良利用方面，应在综合规划与合理布局的基础上，因地制宜地发展农林牧业，含盐较重的地段宜于放牧或作为割草地　，防止生态环境遭受破坏与盐渍化加剧，已垦的盐渍土耕地，尤应重视土壤培肥．

Soda-Saline Soil in the Sanjiang Plain of Helongjiang Province

Small area soda-salinized soil was distributed in parts of Sanjia ng Plain of Heilongjiang Province. The contents of salt of those soil was low, however, the pH value and the degree of alkali were high. It had the double chara cteristics of salinization and basification. The groundwater table was high, and the water was HCO3-Na type. Because of the water insulation layer, the low-level groundwater couldn't exchange with the deeper one, so the formation of those soil had some special characteristics. In order to amend and develop the saline soil, comprehensive planning and reasonable layout should be needed. Agriculture, forest, and pastures should be developed based on the local conditions. In th e section that the contents of salt was large, pasture might suitable. In order to prevent the damage of eco-environment and saliniza- tion, in the saline plowland, the soil fertility should be improved.