浅析酸雨对菜园土硝态氮淋失的影响  

Effect of Simulated Acid Rain on Nitrate Nitrogen Leaching Loss in Vegetable Soil with Application of Compound Fertilizer

作　　者：麦志宏 Mai Zhihong(Ecological Environmental Protection and Water Integrated Service Center,Yongning Street,Zengcheng District,Guangzhou 510000,China)

机构地区：[1]广州市增城区永宁街生态环境保护和水务综合服务中心,广东广州510000

出　　处：《广东化工》2023年第18期137-139,共3页Guangdong Chemical Industry

摘　　要：通过土柱模拟酸雨淋溶试验,研究了施用等复合肥量条件下,不同酸度模拟酸雨以及降雨量对菜园土硝态氮淋失的影响。结果表明,不同酸度模拟酸雨处理下淋滤液硝态氮浓度均随淋溶次数的增加呈不断下降趋势,淋滤液硝态氮浓度最大值为292.9 mg/L(pH=2.0,第1次淋滤液),最小值为93.7 mg/L(pH=6.5,第8次淋滤液)。随着淋洗次数的增加,淋滤液硝态氮浓度降低。试验结果还表明,不同淋洗处理硝态氮的淋失总量均较大,在403.0~649.0 mg之间,其大小顺序为pH 2.0>pH 3.0>pH 4.0>pH 5.0>pH 6.5,随酸雨pH值降低,硝态氮淋失量增大,强酸性降水加剧菜园土中硝态氮淋失。不同淋洗处理对菜园土壤硝态氮累计淋失量的动态变化特征没有大的影响,硝态氮累计淋失量均随着淋溶次数增加不断增大,但不同pH值模拟酸雨对菜园土壤硝态氮的累计量淋失影响很大。A soil column method was applied to study influences of simulated acid rain on leaching loss of nitrate nitrogen from compound fertilizer in vegetable soil.Results revealed that concentration of nitrate nitrogen in leachate decreased with increase of leaching times by different treatment.The largest amount of concentration was 292.3 mg/L(pH=2.0,leachate of first time),while the smallest was 93.7 mg/L(pH=6.5,leacheate of the eighth time).The more leaching times,the lower the concentration of nitrate nitrogen in leachate was.Morever,leaching loss amounts of nitrate nitrogen under different treatment were larger,from 403.0 mg to 649.0 mg,and could be showed in the order of pH 2>pH 3>pH 4>pH 5>pH 6.5.Strong acid rain enhanced nitrate nitrogen leaching in vegetable soil.The lower the pH value,the stronger the leaching loss of nitrate nitrogen was.Effect of different treatment on dynamic characteristics of accumulative leaching loss of nitrate nitrogen was not obvious.The accumulative leaching loss amounts of nitrate nitrogen increased with more times to leach.However,different pH value of simulated acid rain had great effect on accumulative leaching loss of nitrate nitrogen in vegetable soil.

关 键 词：模拟酸雨 菜园土 硝态氮 淋失 

分 类 号：TQ[化学工程]