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Dynamic species-specific metabolic changes in the trees exposed to chronic N+S additions at the Bear Brook Watershed in Maine, USA

  • Rakesh MinochaEmail author
  • Stephanie Long
  • Swathi A. Turlapati
  • Ivan Fernandez
Research paper
  • 40 Downloads

Abstract

Key message

Red spruce (Picea rubens Sarg.) and American beech (Fagus grandifolia Ehrh.) nutritional imbalances observed during 1998–2000 in response to nitrogen additions beginning in 1989 at Bear Brook Watershed in Maine, USA, were reversed by 2013. However, nitrogen-containing metabolites continued to accumulate to detoxify ammonia. While sugar maple (Acer saccharum Marsh.) was N-limited and benefitted from N+S additions, spruce and birch established new homeostatic status via adjusting cellular metabolism.

Context

Increased deposition of atmospheric N leads to changes in forest productivity. Effects of added N+S on changes in cellular metabolism will yield information on species-specific sensitivity to N+S.

Aims

To evaluate foliar metabolic changes in American beech (Fagus grandifolia Ehrh.), sugar maple (Acer saccharum Marsh.), and red spruce (Picea rubens Sarg.) that were exposed to ammonium sulfate [(NH4)2SO4); ~ 28.8 kg S ha−1 yr−1 and 25.2 kg N ha−1 yr−1] additions at West Bear Watershed (WBW) starting in 1989 until the end of this experiment, while East Bear Watershed served as a reference.

Methods

Foliage was collected in 1998–2000 and 2013. Sapwood plugs were also collected in 2013. All were analyzed for ions and metabolites using HPLC and ICP.

Results

During 1998–2000, only N+S-treated beech and spruce foliage had a reduction in Ca and Mg. All species had significantly higher content of N-rich metabolites. In 2013, ammonia detoxification continued in the absence of nutrient deficiencies. Significant changes in growth promoting metabolites occurred only in maple throughout this study.

Conclusion

Metabolic changes indicated that sugar maple at this site was and still is N-limited, whereas red spruce and American beech had to make metabolic adjustments in order to survive under chronic N+S inputs. We conclude that even in the absence of knowledge about individual species tolerance limits for nutrients and critical N load for the site, monitoring with a suite of metabolites that are centrally connected to both C and N pathways could be a very useful tool in assessing stress from nutrient imbalance in various tree species.

Keywords

American beech Bear brook watershed in Maine Foliar metabolism Nitrogen plus sulfur addition Red spruce Sugar maple 

Abbreviations

FAAs

free amino acids

BAI

basal area increment

BBWM

Bear Brook Watershed in Maine

EBW

East Bear Watershed

PAs

Polyamines

Put

Putrescine

Spd

Spermidine

Spm

Spermine

WBW

West Bear Watershed

Notes

Acknowledgments

The authors are grateful to Dr. Walter Shortle, Dr. Gabriela Martinez, and Prof. Subhash Minocha for their suggestions at various steps in data analysis and/or to improve the manuscript; to the field crew for help in sample collection; and to Kenneth R. Dudzik for technical assistance.

Author contributions

Rakesh Minocha designed and wrote the manuscript with assistance from Swathi Turlapati (postdoctoral fellow) who also helped process some data. Stephanie Long (senior technician) helped with field collections and analyses, processing of all metabolic data. Ivan Fernandez helped with manuscript writing and editing and field collections of 2013.

Funding

This work was funded by the USDA Forest Service.

Compliance with ethical standards

Conflict of interest

The authors of this work do not have any conflict of interest statement.

Supplementary material

13595_2019_808_MOESM1_ESM.docx (26 kb)
ESM 1 (DOCX 26 kb)

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2019

Authors and Affiliations

  1. 1.US Department of AgricultureForest Service, Northern Research StationDurhamUSA
  2. 2.Department of Biological SciencesUniversity of New HampshireDurhamUSA
  3. 3.School of Forest Resources and Climate Change InstituteUniversity of MaineOronoUSA

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