中新生态城土壤质量现状及改良利用途径

对中新生态城区域内土壤的紧实度、有机质、碱解氮、土壤盐分、酸碱度、地表水、地下水进行了调查取样分析,结果表明该区土壤容重在1.3～1.7g/cm3,有机质含量大多为中等或低水平（5.5～19.1g/kg）,速效氮与土壤有机质含量相关性达显著水平（r=0.98）。盐分垂直分布上表现为果园、农田土壤盐分含量小于1.5g/kg,荒地和水库含量在5.0～6.4g/kg之间,垫土区、养殖池和盐场盐池土壤通体盐分含量高（大于10g/kg）,且存在表聚现象,超出了一般植物生长的极限。土壤酸碱度为7.81～9.05,水库、养殖池、盐场、荒地、沟塘水的矿化度均在10g/L以上,蓟运河水和农田沟渠为5000mg/L～8500mg/L,果园灌溉水的矿化度也在2000mg/L以上,地下水矿化度高,埋藏浅。并针对以上特点提出其土壤改良利用途径和绿化建设模式。

Quality Status and Improving Ways of Soil in China-Singapore Eco-town

Soil compaction, organic matter, nitrogen, soil salinity, pH, surface water, groundwater of the China- Singapore Eco-Town were sampled and analyzed. The results showed that the soil bulk density was 1.3 - 1.7g/cm3, the organic matter content was mostly at middle or low levels, the content of the rapidly available nitrogen were significant positive correlation to the soil organic matter. The results of the salinity vertical distribution showed that the soil salinity content of the orchards and the farmland was less than 1.5 g/kg, uncropped and reservoir soil was 5.0 6.4 g/kg, pad land areas, aquaculture ponds, salt fields was more than 10 g/kg, and the topsoil was higher than subsurface horizon, and exceeded the salt-tolerance limits of the general plants. The soil pH range was from 7.81 to 9.05. The mineralization degrees of reservoir, aquaculture ponds, salt fields, wasteland ditch ponds were all more than 10 g/L, Jiyunhe canal and farmland ditch water were between 5 000 mg/L and 8 500 mg/L and orchard irrigating water exceeded 2 000 mg/L. The salinity of groundwater was high and the water was shallowly buried. Then the ways of soil improvement and utilization were brought up.