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- W2380454098 abstract "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." @default.
- W2380454098 created "2016-06-24" @default.
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- W2380454098 date "2014-01-01" @default.
- W2380454098 modified "2023-09-26" @default.
- W2380454098 title "Foliar uptake of NH_4~+ in PM_(2. 5) in seedlings of two poplar species using the technique of ~(15)N tracing" @default.
- W2380454098 hasPublicationYear "2014" @default.
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