不同密度杨树人工林河岸缓冲带对无机氮的去除效果  

Effect of the poplar plantation riparian buffer strips with different densities on the removal rate of inorganic nitrogen

作　　者：吕建[1,2] 吴永波 余昱莹[1] 茆安敏 陈欢 Lü Jian;WU Yongbo;YU Yuying;MAO Anmin;CHEN Huan(Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province,Nanjing ForestryUniversity,Nanjing 210037,China;Institute of Botany,Jiangsu Province and Chinese Academy of Sciences,Nanjing 210014,China)

机构地区：[1]江苏省南方现代林业协同创新中心(南京林业大学),南京210037 [2]江苏省中国科学院植物研究所,南京210014

出　　处：《生态科学》2019年第2期146-154,共9页Ecological Science

基　　金：国家重点研发计划(2016YFC0502704);国家林业局"948"项目(2013-4-63);江苏省生物学优势学科建设项目资助

摘　　要：以太湖流域构建的平缓坡度杨树人工林河岸缓冲带为研究对象,比较了三种植物密度(400株·hm^(-2)、1000株·hm^(-2)和1600株·hm^(-2))的河岸缓冲带对不同深度径流水中铵态氮(NH_4^+—N)和硝态氮(NO_3^-—N)的去除率以及河岸缓冲带土壤对铵态氮和硝态氮的截留率。研究结果表明,1600株·hm^(-2)杨树人工林缓冲带对径流水中铵态氮和硝态氮的去除能力最强,在40 m缓冲带处三个土层的平均去除率达72.86%和71.81%,而400株·hm^(-2)缓冲带去除效果较差;在同一土层,土壤铵态氮的截留率大小随土壤铵态氮浓度的增加而提高。1000株·hm^(-2)杨树人工林缓冲带土壤对铵态氮和硝态氮截留效果最好,截留率为32.48%和44.41%, 1600株·hm^(-2)缓冲带其次, 400株·hm^(-2)缓冲带的截留率较低。In this study,the removal rates and resistance rates for selected inorganic nitrogen species(NH 4^+-N and NO3^-N)at poplar plantation riparian buffer strips(RBS)with three planting densities(400,1000,and 1600 stems·hm^-2)were investigated.The results showed that the removal effect of NH 4^+-N and NO 3-N in runoff water in the higher density(1600 stems·hm^-2)RBS was the highest,with the average removal rates of 72.86%and 71.81%,respectively.The removal rates in the lower density(400 stems·hm^-2)RBS were the lowest.For the same soil layer,the resistance rate for NH 4^+-N increased with the increase in concentration of NH 4^+-N in the soil.The resistance rates for NH 4^+-N and NO 3^-N in the middle density(1000 stems·hm^-2)RBS soil were the highest,with the average resistance rates of 32.48%and 44.41%,respectively.The resistance rate in the lower density RBS were the lowest.

关 键 词：杨树人工林缓冲带 林分密度 去除率 铵态氮 硝态氮 

分 类 号：X522[环境科学与工程—环境工程]