江苏农业学报2025，Vol.41Issue(2)：296-304,9.DOI:10.3969/j.issn.1000-4440.2025.02.010
土壤含盐量对滨海盐渍农田土壤氮素转化和淋失特征的影响
Effect of soil salt content on the characteristics of nitrogen transformation and leaching in soils of coastal saline farmland
摘要
Abstract
To explore the influence of soil salt con-tent on characteristics of nitrogen transformation and nitrate nitrogen(NO-3-N)leaching in coastal saline soils,a 120-day soil column experiment was conducted to simulate leaching experiment,with four treatments of different soil salinity levels(CK:<1 g/kg;S1:2 g/kg;S2:3 g/kg;S3:5 g/kg).The dynamic variations of ammonium(NH+4-N)and NO-3-N contents in soils and leachates were monitored to determine the influences of soil salt content on the characteristics of nitrogen transformation and NO-3-N leaching,and the mechanisms were studied.The results showed that compared with CK and S1 treatments,high soil salinity(≥3 g/kg)de-layed the peak time of the soil NH+4-N and NO-3-N contents under S2 and S3 treatments.Meanwhile,the peak value of soil NO-3-N content was significantly decreased.High soil salinity significantly influenced the characteristics of NH+4-N leaching.Compared with CK and S1 treatments,the peak values of NH+4-N mass concentration of leachates under S2 and S3 treat-ments were lower,with later peak time.However,the soil salt content showed no significant influence on the leaching char-acteristics of NO-3-N mass concentrations in leachates and NO-3-N leaching amount.The mass concentrations of NO-3-N in soils and leachates both showed a"two-peak"variation during the detection period.Besides the obvious increase within 30-day after fertilization,NO-3-N contents increased significantly again in soils and leachates 45 days after fertilization.Varia-tion partitioning analysis showed that the combined effect of water input and nitrogen transformation mainly determined NO-3-N leaching.Therefore,when the soil salt content was≥3 g/kg,soil salinity significantly inhibited urea hydrolysis and nitrification processes.However,due to the influence of high water input,soil salinity showed no obvious effect on the NO-3-N leaching.The decrease of water input in the later period of fertilization might lead to obvious soil accumulation of NO-3-N,and might increase the risk of NO-3-N leaching.Thus,rational water management during the crop growth period and planting cover crop during the fallow period are proposed to ameliorate NO-3-N leaching and increase nitrogen use effi-ciency.关键词
滨海盐渍土/土壤盐分/硝化作用/硝态氮淋失/氮素迁移转化Key words
coastal saline soil/soil salinity/nitrification/nitrate nitrogen leaching/transport and transformation of nitrogen分类
农业科技引用本文复制引用
董岳,胡奕婷,张辉,徐聪,聂亚锋,马艳,汪吉东..土壤含盐量对滨海盐渍农田土壤氮素转化和淋失特征的影响[J].江苏农业学报,2025,41(2):296-304,9.基金项目
江苏省自然科学基金项目(BK20241171) （BK20241171）
江苏省农业科技自主创新基金项目[CX(23)1019] （23）
江苏省科技计划项目(BE2023354) （BE2023354）
