【摘要】 本研究为探明崇明设施土壤次生盐渍化现状和特征,在崇明岛的4个地区的5种轮作模式中布置了10个样点,共采集了40个土壤样品,进行了测试与统计分析。结果表明,设施土壤表层有酸化的趋势,表层土EC值高,最高的达到6.47 mS/cm;0～5 cm积盐层NO₃^--N平均值达1 370 mg/kg,有的甚至高达3 054 mg/kg,土壤NO₃^--N表聚明显,水旱轮作与芦笋连作的NO₃^--N的含量差异悬殊,水旱轮作可以一定程度上降低土壤NO₃^--N,延缓土壤次生盐渍化的形成。更多还原

【Abstract】 This research is committed to judge the greenhouse soil salts situation and character,which collected 40 soil samples at 10 sampling points of 5 rotation systems in 4 areas on Chongming Island.According to the correlation analysis,the top of the greenhouse soil had a tendency of acidification.EC of the top soil ranked highest value of 6.47 mS/cm.The results showed the average NO₃^--N of 0-5 cm salic horizon reached 1 370 mg/kg in which the highest value was 3 054 mg/kg.The NO₃^--N accumulation at the surface soil layer was significant.The NO₃^--N contents had a wide gap between paddy-upland rotation and continuous asparagus cropping.To some extent,paddy-upland rotation could reduce the NO₃^--N contents of the soil,delaying secondary salinization.更多还原