Preprints
https://doi.org/10.5194/bg-2019-328
https://doi.org/10.5194/bg-2019-328
28 Oct 2019
 | 28 Oct 2019
Status: this preprint was under review for the journal BG but the revision was not accepted.

Relationships between leaf δ15N and leaf metallic nutrients

Chongjuan Chen, Yingjie Wu, Shuhan Wang, Zhaotong Liu, and Guoan Wang

Abstract. Metallic nutrients play a vital role in plant physiological and biochemical processes such as nitrogen uptake and assimilation, which cause isotopic fractionation against 15N. Thus, investigating the relationships between leaf nitrogen isotope ratio (δ15N) and leaf metallic nutrients could enhance our understanding of nitrogen (N) cycling. However, to our knowledge, these relationships have not been examined as yet. To fill in this research gap, we analyzed leaf δ15N and leaf potassium (K), Calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn) and zinc (Zn) contents of 624 non-N2-fixing plant samples and revealed the relationships between leaf δ15N and these metallic elements. Overall, leaf δ15N correlated positively with leaf K, Ca, Mg and Zn, and negatively with leaf Fe, whereas not with leaf Mn. The relationships of leaf δ15N with leaf K, Ca, Mg, Zn and Fe were not affected by both vegetation type and soil type, suggesting that the observed relationships could be universally valid. However, the relationship between leaf δ15N and leaf Mn depended on vegetation type and soil type, therefore, the observed relationship should not be considered to be universal. These metallic nutrients together accounted for 55.7 % of the variations in leaf δ15N; this emphasized the significance of metallic nutrients in determining leaf δ15N.

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Chongjuan Chen, Yingjie Wu, Shuhan Wang, Zhaotong Liu, and Guoan Wang
 
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Status: closed
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Chongjuan Chen, Yingjie Wu, Shuhan Wang, Zhaotong Liu, and Guoan Wang
Chongjuan Chen, Yingjie Wu, Shuhan Wang, Zhaotong Liu, and Guoan Wang

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Short summary
Relationships between leaf δ15N and concentrations of leaf metallic nutrients have not been examined as yet though they could enhance our understanding of N cycling. By analyzing 624 non-N2-fixing plant samples, we first found that leaf δ15N was positively correlated with leaf K, Ca, Mg and Zn, negatively correlated with leaf Fe, and not related to leaf Mn. All of them together explained 55.7 % of variations in leaf δ15N. This study emphasized the significance of metallic nutrients in N cycling.
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