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VICTORIA'S TEAL CARBON

Carbon stocks, sequestration, and emissions of freshwater wetlands in south eastern Australia

Nontidal wetlands are estimated to contribute significantly to the soil carbon pool across the globe. However, our understanding of the occurrence and variability of carbon storage between wetland types and across regions represents a major impediment to the ability of nations to include wetlands in greenhouse gas inventories and carbon offset initiatives.

We performed a large-scale survey of nontidal wetland soil carbon stocks and accretion rates from the state of Victoria in southeastern Australia—a region spanning 237,000 km2 and containing >35,000 temperate, alpine, and semi-arid wetlands.

Our specific objectives were to: (a) Undertake a landscape-scale assessment of wetland soil carbon stocks by sampling wetland soil carbon from more than 100 wetlands spread across Victoria; (b) compare carbon stocks between wetland types and assess regional variability; (c) Utilize existing data on wetland soil accretion rates, combined with newly collected soil carbon data to estimate wetland soil carbon sequestration; and (d) based on this data, estimate soil carbon stocks and sequestration capacity for the entire region and the potential impact of historical wetland loss on carbon emissions from wetlands.

Program background

Global estimates suggest that freshwater wetlands contain 20%–30% of the terrestrial soil carbon pool, a disproportionately high contribution given that they occupy just  7% of the land surface. Despite their importance, freshwater wetlands have been historically underappreciated, with 87% of global wetland being lost since the early 1700s. They are threatened by land-use change, pollution, water extraction, and landscape modification. Quantifying the contribution of wetland ecosystems to carbon capture and storage is vital to justify the application of improved management strategies that ensure their continued contribution to a
multitude of other ecosystem services.

Program publications & findings

 

Carbon stocks, sequestration, and emission of wetlands in south eastern Australia.

Carnell PE, Windecker SM, Brenker M, Baldock J, Maque P, Brunt K, Macreadie PI (2018)
Global Change Biology 24: 4173-4184

From an analysis of >1,600 samples across 103 wetlands, we found that alpine wetlands had the highest carbon stocks (290  180 Mg Corg ha1), while permanent open freshwater wetlands and saline wetlands had the lowest carbon stocks. Permanent open freshwater sites sequestered on average three times more carbon per year over the last century than shallow freshwater marshes. The duration of water inundation, plant community composition, and allochthonous carbon inputs likely play an important role in influencing variation in carbon storage.

We estimate that wetlands in Victoria have a soil carbon stock in the upper 1 m of 68 million tons of Corg, with an annual soil carbon sequestration rate of 3 million tons of CO2 eq.year1—equivalent to the annual emissions of about 3% of the state’s population.

Selected media

  • Wetlands mask entire VIC city’s emissions (SBS news)
  • Victoria’s inland wetlands store $6 billion in carbon stocks (Media Release)

Project partners & Funding sources

This work was led by Dr Paul Carnell from Deakin University’s Blue Carbon Lab, involving partners from Edith Cowan University and the Victorian Catchment Management Authorities (CMAs): North Central CMA, North East CMA, Goulbum Broken CMA, Glenelg Hopkins CMA.

Funding was provided by Victoria Government’s Department of Environment, Land, Water & Planning grant (DELWP) and an Australian Research Council Linkage grant.

@BlueCarbonLab

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Contact

Dr Paul Carnell (p.carnell@deakin.edu.au)

Deakin University
  • Home
  • About
    • What we are about
    • Who we are
      • Professor Peter Macreadie
      • Dr Paul Carnell
      • Dr Stacey Trevathan-Tackett
      • Dr Maria M. Palacios
      • Dr Pawel Waryszak
      • Dr Melissa Wartman
      • Dr Micheli Duarte de Paula Costa
      • Dr Noyan Yilmaz
      • Dr Martino Malerba
      • Dr Lukas Schuster
      • Dr Tanveer Adyel
      • Dr Sabiha Marine
      • Dr Vincent Raoult
      • Dr Jacqui Pocklington
      • Interns and Volunteers
      • Alumni
  • Research
    • Blue Carbon
      • Seychelles Blue Carbon
      • Queensland Blue
      • Victoria’s Blue Carbon
      • Blue Carbon Management
      • Tea Composition H2O
    • Teal Carbon
      • Farm dams
      • Floating wetlands
      • Revitalising Australia’s Freshwater Wetlands
    • Valuing Ecosystem Services
      • Mapping Ocean Wealth
      • Guide to Valuing Coastal Wetlands
    • Ecosystem Restoration
      • Coastal Wetland Restoration
        • The Victorian Coastal Wetland Restoration Program
        • Regenerating Our Coasts
        • Towards Blue Carbon Australian Carbon Credit Units
      • Kelp restoration
      • Freshwater Wetland Restoration
    • Citizen Science
      • HSBC citizen science
      • GeelongPort citizen science
    • Microplastics
    • Marine Biosecurity
    • Decommissioning Infrastructure
  • Services
    • Wetland Carbon Assessments
    • Environmental Assessments
    • Environmental Restoration
    • Citizen Science
    • System of Environmental Economic Accounting (SEEA)
    • Feasibility Assessments
    • Remote Sensing
    • Microbial Analysis
    • Marine Biosecurity
  • Publications
  • Opportunities
  • News
  • Donate
  • Contact
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