the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Relationships between leaf δ15N and leaf metallic nutrients
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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RC1: 'Nice work but needs minor revisions', Anonymous Referee #1, 27 Dec 2019
- AC1: 'Response to comments from Referee #1', Guoan Wang, 16 Jan 2020
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RC2: 'Review of "Relationships between leaf δ15N and leaf metallic nutrients", Chen et al., 2019', Anonymous Referee #2, 30 Dec 2019
- AC2: 'Response to comments from Referee #2', Guoan Wang, 16 Jan 2020
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RC3: 'Comments on "Relationships between leaf δ15N and leaf metallic nutrients" by Chen et al.', Anonymous Referee #3, 25 Feb 2020
- AC3: 'Response to comments from Referee #3', Guoan Wang, 28 Feb 2020
-
RC1: 'Nice work but needs minor revisions', Anonymous Referee #1, 27 Dec 2019
- AC1: 'Response to comments from Referee #1', Guoan Wang, 16 Jan 2020
-
RC2: 'Review of "Relationships between leaf δ15N and leaf metallic nutrients", Chen et al., 2019', Anonymous Referee #2, 30 Dec 2019
- AC2: 'Response to comments from Referee #2', Guoan Wang, 16 Jan 2020
-
RC3: 'Comments on "Relationships between leaf δ15N and leaf metallic nutrients" by Chen et al.', Anonymous Referee #3, 25 Feb 2020
- AC3: 'Response to comments from Referee #3', Guoan Wang, 28 Feb 2020
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