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Absorption and partitioning mechanism of nitrogen oxides by typical greening species of tree in Beijing

文献类型： 外文期刊

作者： Lu, Shaowei 1 ; Wang, Mengxue 1 ; Fang, Jiaxing 1 ; Zhang, Junjie 1 ; Xu, Xiaotian 1 ; Li, Bin 1 ; Zhang, Qin 1 ; Liu, Chen 1 ; Zhao, Na 1 ; Li, Shaoning 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Forestry & Pomol, Beijing 100093, Peoples R China

2.Beijing Yanshan Forest Ecosyst Res Stn, Natl Forest & Grassland Adm, Beijing 100093, Peoples R China

3.Shenyang Agr Univ, Coll Forestry, Shenyang 110866, Peoples R China

关键词： Artificial fumigation; Green tree species; Isotope tracer method; Absorption partitioning

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：4.7； 五年影响因子：5.4 ）

ISSN： 0098-8472

年卷期： 2024 年 228 卷

页码：

收录情况： SCI

摘要： In this study, we analyzed the uptake of nitrogen dioxide (NO2) and its processes of distribution in various organs of different typical greening species of trees and the differences in its uptake by these different species using the N-15 stable isotope tracer method under the gradient of three NO2 concentration treatments, namely, low, medium and high. These experiments were conducted using one-time artificial fumigation to provide necessary data and theoretical support for the selection and application of species of greening trees in urban gardens. The treatments of fumigation with different concentrations of NO2 showed that the leaves of the six species of trees had the highest content of N-15. The organs that were the most effective at taking up N-15 were the leaves in broadleaf trees and the branches in conifers. The content of N-15 per unit of the leaves (0.0058-2.0486 mu g/g) increased in parallel with the concentration of fumigant and then was rapidly transported to various organs in the tree. This caused different degrees of changes in other organs. The total content of N-15 per unit was higher in the broadleaf species (0.0129-2.3171 mu g/g) than in the conifers (0.0296-0.1260 mu g/g). The leaves of broadleaf trees were the most effective at taking up N-15 (0.0054-1.3228 %) under medium and high concentrations of fumigant with the exception of ginkgo. The ability of each organ of the other broadleaf species was leaves>branches>trunks>roots, and the branches of conifers were the most effective parts of the trees at taking up NO2 under three concentrations of fumigants (0.0789-0.4005 %). The highest rate of distribution of N-15 was found in the leaves (48.14-99.53 %) in all six species under different concentrations of fumigant, and the distribution in the other organs varied to different degrees.

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