不同浸提条件对土壤氨氮提取数量的影响  

作　　者：汪发勇 白建军 孙定钊 刘满义 尹磊 

机构地区：[1]贵州省地质矿产勘查开发局测绘院,贵州贵阳550000 [2]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550000

出　　处：《环境保护与循环经济》2024年第2期33-37,共5页environmental protection and circular economy

基　　金：贵州省科技计划项目“基于时空大数据的国土空间生态修复监测评估体系研究与应用”(黔科合支撑〔2022〕一般199);贵州省地质矿产勘查开发局科研项目“基于‘3S’的山水工程生态环境动态监测与评估体系研究--以贵州乌蒙山三岔河流域为例”(黔地矿科合〔2021〕27号);贵州省地矿局测绘院青年科学研究项目“基于国土空间生态修复规划的生态保护修复分区研究”(黔地矿测科合〔2020〕02号);贵州省地矿局测绘院青年科学研究项目“基于土壤镉污染背景下的耕地安全利用模式研究”(黔地矿测科合〔2022〕03号)。

摘　　要：土壤溶解性有机氮(DON)的推算是通过测试土壤全氮、氨氮和硝态氮的数量,利用全氮减去氨氮和硝态氮获得。不同区域或不同学者对DON的定义不同,在测试过程中选取多种浸提方法测定土壤氨氮,结果导致测试结果存在较大的差异。但这种差异受到何种因素控制,目前还没有形成统一的认识。基于此,研究应用正交试验方法,通过统计分析了振荡时间、浸提剂、温度以及土水比对土壤氨氮浸提数量的影响。结果表明:不同因素对氨氮浸提数量的影响程度为土水比>浸提剂>振荡时间>温度;对氨氮浸提数量分别表现为随土水比与浸提剂浓度增大而升高;在浸提温度低于50℃时,土壤氨氮的浸提数量随温度升高而升高;振荡时间在60 min内,土壤氨氮的提取数量随着振荡时间增加而增高。Dissolved organic nitrogen(DON)in soil is by testing the soil total nitrogen,ammonia nitrogen and nitrate nitrogen,then use the total nitrogen to subtract the number of ammonia nitrogen and nitrate nitrogen to obtain.Due to the different area or the different definition about DON,there are numerous extraction methods of soil nitrogen,which result in that there is no comparability between results.However,there is no unified understanding about what are control factors.Based on this background,the study applied orthogonal test method to statistically analyze the effects of shaking time,leaching agent,temperature,and soil-water ratio on the amount of soil ammonia nitrogen leached.The results show that the influences of different factors can be represented as:soil-water ratio>leaching agent>shaking time>temperature.Extraction volume of ammonia showed an increasing with the increase of soil-water ratio and the concentration of extractors.When the extraction temperature lower than 50℃,the amount of soil ammonium nitrogen increase with temperature.Within 60 minutes of shaking time,the extraction of soil ammonium amount increased with the increase of shaking time.

关 键 词：溶解性有机氮 提取方法 氨氮 正交试验 数量 

分 类 号：X833[环境科学与工程—环境工程]