Dual N and O isotopes of nitrate in natural plants: first insights into individual variability and organ-specific patterns

	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
发表期刊	Biogeochemistry
卷号	114 期号:1-3 页码:399-411
摘要	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.
关键词	Denitrifier Method Nitrate Reduction 15n 18o Soil n Availability Natural Plant
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5058
专题	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
推荐引用方式 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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