Plant and Soil

, Volume 416, Issue 1–2, pp 193–204 | Cite as

The contrasting effects of nutrient enrichment on growth, biomass allocation and decomposition of plant tissue in coastal wetlands

  • Matthew A. Hayes
  • Amber Jesse
  • Basam Tabet
  • Ruth Reef
  • Joost A. Keuskamp
  • Catherine E. Lovelock
Regular Article



Eutrophication of coastal waters can have consequences for the growth, function and soil processes of coastal wetlands. Our aims were to assess how nutrient enrichment affects growth, biomass allocation and decomposition of plant tissues of a common and widespread mangrove, Avicennia marina, and how eutrophication drives changes in below-ground carbon sequestration.


We assessed this through the measurement of above- and belowground growth and decomposition rates of plants and plant tissue in unenriched or nutrient enriched treatments.


Nutrient enrichment increased biomass allocation above-ground compared to below-ground in seedlings but not in fully developed, mature trees where we observed the opposite pattern. Experiments to assess root decomposition found that 40–50% of biomass was lost within six months with little change between 12 and 18 months, indicating a high potential for accumulation of organic matter over time. We estimate root-derived carbon sequestration rates of 53, 250 and 94 g C m−2 year−1 for unenriched control, N and P enriched treatments, respectively.


These results show coastal eutrophication can be beneficial and detrimental to ecosystem function of coastal plants. Eutrophication stimulates root growth in fully developed trees, increasing organic matter input to soils. Our data suggests that organic matter accumulation will increase in areas with high nutrient availability where root growth is increased and rates of decomposition are low.


Carbon Eutrophication Growth Mangrove Nutrients 



This work was partially supported by the CSIRO Marine and Coastal Carbon Biogeochemistry Cluster (Coastal Carbon Cluster) and The National Center for Groundwater Research and Training.

Author contributions

MH and CEL conceived and designed the experiments. MH, AJ, BT, and RR performed the experiments. MH, JK and CEL analysed the data. MH wrote the manuscript; with other authors providing editorial advice.


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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Matthew A. Hayes
    • 1
  • Amber Jesse
    • 2
  • Basam Tabet
    • 2
  • Ruth Reef
    • 3
  • Joost A. Keuskamp
    • 4
    • 5
  • Catherine E. Lovelock
    • 2
  1. 1.Smithsonian Environmental Research CenterSmithsonian InstitutionEdgewaterUSA
  2. 2.School of Biological SciencesThe University of QueenslandSt. LuciaAustralia
  3. 3.School of Earth, Atmosphere and EnvironmentMonash UniversityClaytonAustralia
  4. 4.Ecology and Biodiversity, Department of BiologyUtrecht UniversityUtrechtThe Netherlands
  5. 5.Netherlands Institute of Ecology (NIOO-KNAW)WageningenThe Netherlands

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