秦淮河疏浚底泥土地投放对投放土壤的影响

[目的]研究疏浚底泥投放对投放土壤的影响。[方法]以蔬菜(苋菜和空心菜)、牧草(黑麦草和紫花苜蓿)、粮食作物(大豆和玉米)为投放对象,研究秦淮河南京市区段疏浚底泥不同比例投放对投放土壤的影响。[结果]牧草植物土培后土壤中全氮含量比其他2类植物高。3类植物土培后土壤中氨氮含量的最大值为3.1~11.7 mg/kg。粮食作物土培后土壤中硝态氮含量比其他2类植物低的多。植物栽培后,土壤中全磷含量的最大值均大于751.5 mg/kg,土壤中速效磷含量均随着底泥施用量的增加而增加,土壤中有机质含量的最大值为18.2~25.0 g/kg。[结论]该研究为筛选合适的疏浚底泥投放对象和研究疏浚底泥土地投放的生态风险提供了依据。

Effects of Land Application of Dredged Sludge from Qinhuai River on the Applied Soil

[Objective] The research aimed to study the effects of applying the dredged sludge on the applied soil.[Method] With the vegetables(Amaranthus mangostanus L and Lpomoea aqetica Forsk.),forage(Lolium perenne L.and Medicago sativa L.) and grain crops(soybean and maize) as the applying objects,the effects of different application of the dredged sludge from Nanjing section of Qinghuai River on the applied soil were studied.[Result] The content of total nitrogen in the soil after culturing herbage plants was higher than that of 2 other groups of plants.After 3 groups of plants were cultured in the soil,the maximum of ammonia-nitrogen content in the soil was 3.1～11.7 mg/kg.After grain crops were cultured in the soil,the content of nitrate nitrogen in the soil was greatly lower than that of 2 other groups of plants.After plants were cultured,the maximum of total P content in the soil were all higher than 751.5 mg/kg.The content of available P in the soil was increased with the increasing of the application amount of sludge.The maximum of organic matter content in the soil was 18.2～25.0 g/kg.[Conclusion] This research provided the basis for screening the suitable applying object of the dredged sludge and studying the ecological risk of land application of the dredged sludge.