赤峰市设施土壤次生盐渍化现状分析

对内蒙古赤峰市7个设施蔬菜基地进行设施土壤次生盐渍化调查,对2个种植年限较长的基地进行土样检测分析。结果表明,随着种植年限的增加,设施土壤可溶性盐含量呈现先升高后降低的趋势,种植10 a的0～5 cm土层土壤可溶性盐含量最高可达11.4 g·kg~(-1),显著高于相邻露地;而随着栽培耕层的加深,土壤可溶性盐含量表现出明显的表聚特征,呈现(0～5)cm(5～15)cm(15～25)cm的趋势;设施土壤EC值、主要盐离子含量也随着种植年限的增加呈现先升高后降低的趋势;且不同地区的设施土壤盐分组成存在一定差异。

Status Analysis of Secondary Salinization of Greenhouse Soil in Chifeng City

Investigation was conducted on secondary soil salinization of 7 planting greenhouse vegetable bases in Chifeng City，and soil sample detection analysis was carried out on 2 bases being planted for longer years. The results showed that the contents of soluble salt in greenhouse soil was increasing first then reducing. The soil soluble salt content in 0-5 cm soil layer after 10 years planting could reach the highest level 11.4 g·kg^-1，which was significantly higher than the neighbouring open fields. Along with the deepening of topsoil cultivation，the soil soluble salt content showed a tendency of decreasing，（0-5）cm ＞（5-15）cm ＞（15-25）cm. The EC value of greenhouse soil and main saltion content also showed a trend of first increasing then decreasing along with the increase of planting years. There were some differences in salt composition in greenhouse soil of different areas.