Increasing reclamation ages drive shifts in carbon and nitrogen stoichiometry and natural isotopes from leaf-litter-root-soil continuum in a reclamation ecosystem, North China

Yuan, Ye; Zhou, Zheng-Wei; Zhang, Shuaihang; Zhao, Yifang; Gao, Yuan; Hou, Fen

doi:10.1007/s11368-023-03449-3

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“…Carbon-isotope discrimination (Δ) in plants is associated with photosynthetic rate (A) and stomatal conductance (g s ) [ 1 , 2 , 3 , 4 ]; photosynthetic rate varies with leaf N concentrations because most leaf N concentrates in the photosynthetic apparatus [ 5 , 6 , 7 ]; hence, a tight relationship between leaf N and Δ is expected. Numerous studies have confirmed this relationship [ 8 , 9 , 10 , 11 , 12 , 13 ]. However, lack of this relationship has also been observed in a few investigations [ 14 , 15 ].…”

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confidence: 83%

Addressing the Relationship between Leaf Nitrogen and Carbon Isotope Discrimination from the Three Levels of Community, Population and Individual

Wang

Han

Jia

et al. 2023

Plants

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The carbon, nitrogen and water cycles of terrestrial ecosystems are important biogeochemical cycles. Addressing the relationship of leaf nitrogen (N) and carbon isotope discrimination (Δ) will enhance the understanding of the links between these three cycles in plant leaves because Δ can reflect time-integrated leaf-level water-use efficiency (WUE) over the period when the leaf material is produced. Previous studies have paid considerable attention to the relationship. However, these studies have not effectively eliminated the interference of environmental factors, inter-species, and inter-individual differences in this relationship, so new research is necessary. To minimize these interferences, the present work explored the relationship at the three levels of community, population, and plant individual. Three patterns of positive, negative and no relationship were observed across communities, populations, and individuals, which is dependent on environmental conditions, species, and plant individuals. The results strongly suggested that there is no general pattern for the relationship between leaf N and Δ. Furthermore, the results indicated that there is often no coupling between leaf-level long-term WUE and leaf N in the metabolic process of carbon, N and water in leaves. The main reason for the lack of this relationship is that most plants do not invest large amounts of nitrogen into photosynthesis. In addition, the present study also observed that, for most plant species, leaf N was not related to photosynthetic rate, and that variations in photosynthetic rates are mainly driven by stomatal conductance.

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