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Nitrogen uptake strategies of mature conifers in Northeastern China, illustrated by the 15N natural abundance method
Ecological Processes ( IF 4.8 ) Pub Date : 2021-05-31 , DOI: 10.1186/s13717-021-00306-4 Xulun Zhou , Ang Wang , Erik A. Hobbie , Feifei Zhu , Xueyan Wang , Yinghua Li , Yunting Fang
Ecological Processes ( IF 4.8 ) Pub Date : 2021-05-31 , DOI: 10.1186/s13717-021-00306-4 Xulun Zhou , Ang Wang , Erik A. Hobbie , Feifei Zhu , Xueyan Wang , Yinghua Li , Yunting Fang
Conifers partition different N forms from soil, including ammonium, nitrate, and dissolved organic N (DON), to sustain plant growth. Previous studies focused on inorganic N sources and specific amino acid forms using 15N labelling, but knowledge of the contribution of DON to mature conifers’ N uptake is still scarce. Here, we quantified the contribution of different N forms (DON vs. NH4+ vs. NO3−) to total N uptake, based on 15N natural abundance of plant and soil available N, in four mature conifers (Pinus koraiensis, Pinus sylvestris, Picea koraiensis, and Larix olgensis). DON contributed 31%, 29%, 28%, and 24% to total N uptake by Larix olgensis, Picea koraiensis, Pinus koraiensis, and Pinus sylvestris, respectively, whereas nitrate contributed 42 to 52% and ammonium contributed 19 to 29% of total N uptake for these four coniferous species. Our results suggested that all four conifers could take up a relatively large proportion of nitrate, while DON was also an important N source for the four conifers. Given that DON was the dominant N form in study soil, such uptake pattern of conifers could be an adaptive strategy for plants to compete for the limited available N sources from soil so as to promote conifer growth and maintain species coexistence.
更新日期：2021-05-31
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