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当前位置: 首页 > 文章 > 应用~(15)N示踪法研究两种杨树叶片对PM_(2.5)中NH_4~+的吸收 生态学杂志 2014,33 (6) 1688-1693
Position: Home > Articles > Foliar uptake of NH_4~+ in PM_(2. 5) in seedlings of two poplar species using the technique of ~(15)N tracing Chinese Journal of Ecology 2014,33 (6) 1688-1693

应用~(15)N示踪法研究两种杨树叶片对PM_(2.5)中NH_4~+的吸收

作  者：
石婕;刘庆倩;安海龙;曹学慧;刘超;尹伟伦;夏新莉;郭惠红
单  位：
北京林业大学生物科学与技术学院
关键词：
~(15)N示踪;毛白杨;欧美杨;NH_4~+;叶片吸收;PM_(2.5)
摘  要：
NH4+等水溶性无机离子是细颗粒物(PM2.5)中的主要组成部分。本实验以毛白杨(Populus tomentosa)和欧美杨(Populus deltoids×Populus nigra)苗木为试材,应用15N示踪法研究2种表面结构不同的叶片对NH4+的吸收以及叶片吸收氮素后的运转和分配。结果表明:2种杨树在吸收叶面的15NH4+时存在明显差异,最大吸收速率均发生在处理后6 h,但毛白杨的最大吸收速率约为欧美杨的3倍;2种杨树叶片15N含量均在处理后24 h时达到峰值,而毛白杨叶片的15N含量约为欧美杨的4倍;叶片施用15N标记的硫酸铵溶液还可以显著增加2种杨树叶片氮素水平,处理7 d后毛白杨和欧美杨叶片全氮含量分别达到对照的1.26和1.36倍;植株各器官的氮素分配率(Ndff)值显示,功能叶吸收的氮素向植株上部和下部均有运输,毛白杨主要积累于茎部,而黑杨则将氮素运输至根系;处理7 d后叶片标记溶液的施用在不同程度上增强了2种杨树叶片的净光合速率,但对叶片的气孔导度无明显影响。
译  名：
Foliar uptake of NH_4~+ in PM_(2. 5) in seedlings of two poplar species using the technique of ~(15)N tracing
作  者：
SHI Jie;LIU Qing-qian;AN Hai-long;CAO Xue-hui;LIU Chao;YIN Wei-lun;XIA Xin-li;GUO Hui-hong;College of Biological Science and Technology,Beijing Forestry University;
关键词：
~(15)N trace;;Populus tomentosa;;Populus deltoids × Populus nigra;;NH4~+;;foliar up-take;;PM_(2.5)
摘  要：
Water-soluble inorganic ions such as NH4+are the major components of fine particles( PM2. 5). The absorption,distribution and utilization of NH4+on the leaf surface of Populus tomentosa and P. deltoids × P. nigra seedlings were studied by using the15N trace technique.Our results showed that15NH4+was absorbed rapidly by P. tomentosa and P. deltoids × P.nigra leaves and the rates of absorption all peaked 6 hours after solution application. Significant differences were observed in the absorption rate between two poplar species,with the maximum absorption rate of P. tomentosa being 3 times that of P. deltoids × P. nigra. The content of15N in leaves peaked at the same time( 24 hours after treatment) in the two species,but the maximum amount of15N of P. tomentosa was about 4 times that of P. deltoids × P. nigra. Foliar application of15N-labeled ammonium sulfate(15NH4SO4) solution led to a significant increase of total nitrogen level in the leaves of both poplars. The leaf total N contents of P. tomentosa and P.deltoids × P. nigra were 1. 26 and 1. 36 times that of control 7 days after treatment,respectively. The Ndff values of different organs showed that the15N absorbed by functional leaves was transported to both the upper and lower parts of the plants,which was mainly stored in stems of P. tomentosa,but transported to roots of P. deltoids × P. nigra. Foliar application of15NH4SO4enhanced the net photosynthetic rate of both poplars to varied degrees 7 days after treatment,but no significant effect on stomatal conductance was observed.

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