Carbon sequestration following stand-replacing fires in Spanish woodlands Jason Kaye Joan Romanyá Ramón Vallejo.

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Presentation transcript:

Carbon sequestration following stand-replacing fires in Spanish woodlands Jason Kaye Joan Romanyá Ramón Vallejo

How does fire affect C storage in temperate forests? Time C Storage (g/m 2 ) Plants Soils Fire Some hypotheses

Can fire affect country-scale C budgets? Well known in tropical and boreal ecosystems Surprisingly little work in temperate ecosystems –Like the U.S. and Spain Book-keeping models and simulations suggest: –In the 1980’s US terrestrial C sink = 0.3 to 0.6 Pg/yr –Fire suppression accounted for 0.12 Pg/yr We need field data to back up the simulations –Our goal is to measure fire-C interactions in the field

Study Site: Garraf massif Garrigue = Q. coccifera With Pinus Halepensis Mediterranean climate PPT: mm

Intro to Mediterranean Woodlands

4 years after fire

18 years after fire

50+ years after fire

Old and new data from the site First fire-C storage work done in 1985 –Chronsequence = 13 yrs Resampled and new sites added in: –1989Chronsequence = 17 yrs –2003Chronsequence = 30 yrs –In total 19 sites sampled

Seven C pools measured 1.Trees 2.Shrubs 3.Herbs 4.Oi + Oe Layer: (LF) 5.Oa layer: (H) 6.Mineral soil 0 to 5 cm 7.Mineral soil 5 to 10 cm Plant CSoil C No change

Plant C accumulates - slowly Range of unburned sites Native shrubs have limited C storage potential Pines increase storage 10x Shrubs

How does C storage change? – Organic soil horizons Range of unburned sites A very predictable small accumulation ~ 600 g/m 2 Oe + Oi Layer

How does C storage change? – Organic soil horizons A small loss with high variance ~300 g/m 2 Range of unburned sites Oa layer

How does C storage change? – Mineral Soil A large loss with high variance ~2000 g/m 2 Surface Mineral Soil Range of unburned sites

How does C storage change? – Plants + Soils ~3000 g/m 2 could accumulate in the future Range of unburned sites Plants Soils Ecosystem ~5000 g/m 2 lost at burning (mostly plants) ~2000 g/m 2 lost from 0-15yrs (mostly soil) ~2000 g/m 2 gained from 15 to 30 yrs

Implications Plantations provide a Kyoto sink Unless they burn – then a Kyoto emission In eastern Spain, more fires burning a larger area than any time over the past century Our research provides the first step toward accurate reporting of sinks and emissions We also identified some interesting ecological interactions along the way.

What controls tree C accumulation? Pines have serotinous cones –Seeds viable w/in two years of fire –Competition with resprouting shrubs Reproductive maturity at 10+ years –Fire intervals less < 10 years = no trees This sets the stage for multiple stable states of C storage in plants