| Dual N and O isotopes of nitrate in natural plants: first insights into individual variability and organ-specific patterns | |
| Xue-Yan Liu; Keisuke Koba; Yu Takebayashi; Cong-Qiang Liu; Yun-Ting Fang; Muneoki Yoh | |
| 2013 | |
| Source Publication | Biogeochemistry
 |
| Volume | 114Issue:1-3Pages:399-411 |
| Abstract | Nitrate (NO3 (-)) is an important form of nitrogen (N) available to plants. The measurements of NO3 (-) concentration [NO3 (-)] and isotopes (delta N-15 and delta O-18) in plants provide unique insights into ecosystem NO3 (-) availability and plant NO3 (-) dynamics. This work investigated the variability of these parameters in individuals of a broadleaved (Aucuba japonica) plant and a coniferous (Platycladus orientalis) plant, and explored the applicability of tissue NO3 (-) isotopes for deciphering plant NO3 (-) utilization mechanisms. The NO3 (-) in washed leaves showed concentration and isotopic ratios that were much lower than that in unwashed leaves, indicating a low contribution of atmospheric NO3 (-) to NO3 (-) in leaves. Current leaves showed higher [NO3 (-)] and isotopic ratios than mature leaves. Moreover, higher leaf [NO3 (-)] and isotopic enrichments (relative to soil NO3 (-)) were found under higher soil NO3 (-) availability for A. japonica. In contrast, leaves of P. orientalis showed low [NO3 (-)] and negligible isotopic enrichments despite high soil NO3 (-). Higher [NO3 (-)] was found in both fine and coarse roots of the P. orientalis plant, but significant isotopic enrichment was found only in coarse roots. These results reflect that the NO3 (-) accumulation and isotopic effects decreased with leaf age, but increased with soil NO3 (-) supply. Leaves are therefore identified as a location of NO3 (-) reduction for A. japonica, while P. orientalis did not assimilate NO3 (-) in leaves but in coarse roots. This work provided the first organ-specific information on NO3 (-) isotopes in plant individuals, which will stimulate further studies of NO3 (-) dynamics in a broader spectrum of plant ecosystems. |
| Keyword | Denitrifier Method Nitrate Reduction 15n 18o Soil n Availability Natural Plant |
| Subject Area | 环境地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5058 |
| Collection | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 |
| Recommended Citation GB/T 7714 | Xue-Yan Liu,Keisuke Koba,Yu Takebayashi,et al. Dual N and O isotopes of nitrate in natural plants: first insights into individual variability and organ-specific patterns[J]. Biogeochemistry,2013,114(1-3):399-411. |
| APA | Xue-Yan Liu,Keisuke Koba,Yu Takebayashi,Cong-Qiang Liu,Yun-Ting Fang,&Muneoki Yoh.(2013).Dual N and O isotopes of nitrate in natural plants: first insights into individual variability and organ-specific patterns.Biogeochemistry,114(1-3),399-411. |
| MLA | Xue-Yan Liu,et al."Dual N and O isotopes of nitrate in natural plants: first insights into individual variability and organ-specific patterns".Biogeochemistry 114.1-3(2013):399-411. |
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