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Leaf and tree age-related changes in leaf ecophysiological traits, nutrient, and adaptive strategies of Alnus nepalensis in the central Himalaya

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Abstract

Leaf ecophysiological traits are known to change with leaf and tree age. In the present study, we measured the effect of leaf and tree age on leaf ecophysiological and morphological traits of nitrogen-fixing Alnus nepalensis (D. Don) which is a pioneer tree species in degraded lands. Three naturally occurring A. nepalensis forest stands, namely young (5–8 years old), mature (40–55 years old), and old (130–145 years old), were considered in this study. We also investigated the seasonal variations in leaf ecophysiological and morphological traits during leaf flushing, fully expanded, and leaf senescence phenological stages. The ecophysiological and morphological traits were compared between leaf and tree ages using a linear mixed-effect model (LMM) and Tukey’s HSD test. Fully expanded leaves and young trees demonstrate ecophysiological traits consistent with acquisitive resource-use strategies. Our results revealed that net photosynthetic capacity (Aarea and Amass), leaf stomatal conductance (gswarea and gswmass), transpiration rate (Earea and Emass), specific leaf area (SLA), predawn and midday water potential (Ψ), leaf total chlorophyll concentration, photosynthetic N- and P-use efficiency (PNUE and PPUE) were higher in younger trees than mature and old trees. We found lower water-use efficiency (WUE) and intrinsic water-use efficiency (WUEi) in young trees than in mature and old ones. Mass-based net photosynthetic capacity (Amass) was positively correlated with PNUE, PPUE, transpiration rate, stomatal conductance, SLA and chlorophyll concentrations but negatively correlated with WUE and WUEi. However, mass-based leaf nitrogen (N) and phosphorus (P) concentrations were the highest in fully expanded leaves and did not vary with tree age despite N concentration being negatively correlated with SLA. Overall, this study provides valuable insights into the age-related changes in leaf ecophysiological traits of A. nepalensis. The findings underscore the importance of considering tree age when studying plant ecophysiology and highlight the acquisitive resource-use strategies employed by young trees for rapid growth and establishment.

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Acknowledgements

Financial support from the Department of Science and Technology (DST), New Delhi, India (SERBNo:DST/IS-STAC/CO2-SR-181/13 G), [DST/SPLICE/CCP/NMSHE/TF2015/JNU/2014[G]] and DST PURSE is acknowledged. This research was carried out as part of the Ph.D. program of RKJ, which was financially supported by University Grants Commission (UGC), India. We express our gratitude to the editor and the two anonymous reviewers for their invaluable suggestions and comments, which greatly contributed to enhancing the quality of this manuscript.

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SCG and RKJ conceived the idea; RKJ, AM, and RG, designed and conducted the field experiment and analyzed the data; RKJ, RG, and AM contributed reagents/materials/analysis tools; RKJ wrote the manuscript, and SCG, AM, and RG edited the manuscript.

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Correspondence to Satish Chandra Garkoti.

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Corresponding editor: Agepati Raghavendra

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Joshi, R.K., Mishra, A., Gupta, R. et al. Leaf and tree age-related changes in leaf ecophysiological traits, nutrient, and adaptive strategies of Alnus nepalensis in the central Himalaya. J Biosci 49, 24 (2024). https://doi.org/10.1007/s12038-023-00385-9

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