长三角不同地区蔬菜种植土壤硝态氮含量分析

Analysis on Nitrate Nitrogen Content of Soils for Planting Vegetable in Different Areas of Yangtze River Delta

调查了长江三角洲苏州、镇江、扬州、宜兴、常州市的蔬菜大棚和露天菜地种植情况,并采集土壤样品测定了土壤硝态氮含量。结果表明,江苏省长江三角洲蔬菜地土壤无论是多年大棚菜地还是露天菜地,都有较为严重的硝态氮残留。设施蔬菜地土壤硝态氮含量比露天菜地的普遍要高,按平均值比较依次为,宜兴>常州>扬州>镇江>苏州。露天菜地土壤硝态氮残留依次是常州>苏州>镇江>宜兴>扬州。其中,设施蔬菜地土壤硝态氮含量最高值出现在宜兴达88.4 mg/kg,通过分析采样信息得出,环太湖地区蔬菜地土壤硝态氮污染程度较大,地下水的污染加重了土壤的污染。

The paper reports the investigation result of vegetable cultivation in greenhouses and open-air and their soil nitrate nitrogen contents in Suzhou, Zhenjiang, Yangzhou, Yixing and Changzhou of Yangtze River Delta. The results showed that there is a lot of nitrate nitrogen residual in soils of greenhouses and open-air vegetable lands and the soil nitrate nitrogen content of greenhouses is generally higher than that of open-air lands. The soil average nitrate nitrogen value in greenhouses is Yixing〉Changzhou〉Yangzhou〉 Zhenjiang〉Suzhou and the soil nitrate nitrogen residual in open-air vegetable lands is Changzhou〉 Suzhou 〉 Zhenjiang〉 Yixing〉 Yangzhou. The maximum nitrate nitrogen residual value （88. 4 mg/kg） was determined in the greenhouse＇s soil in Yixing. The pollution of subsurface water makes more serious nitrate nitrogen pollution of vegetable soils around the Tai Lake.