Carbon fractions in the world’s dead wood
| Autor: | Adam Martin, Grant Dimke, Mahendra Doraisami, Sean Thomas |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
bepress|Physical Sciences and Mathematics EarthArXiv|Physical Sciences and Mathematics|Environmental Sciences bepress|Physical Sciences and Mathematics|Earth Sciences 15. Life on land EarthArXiv|Physical Sciences and Mathematics|Earth Sciences 010603 evolutionary biology 01 natural sciences EarthArXiv|Physical Sciences and Mathematics EarthArXiv|Physical Sciences and Mathematics|Earth Sciences|Biogeochemistry 13. Climate action bepress|Physical Sciences and Mathematics|Environmental Sciences bepress|Physical Sciences and Mathematics|Earth Sciences|Biogeochemistry 010606 plant biology & botany |
| Popis: | Alarming increases in tree mortality due to environmental change suggest that contributions of dead wood to global carbon (C) cycles are rapidly increasing 1-3, with dead wood C flux estimates already approximating total annual anthropogenic C emissions 4. Quantifying C in dead wood critically depends on accurate estimates of dead wood C fractions (CFs) to convert dead woody biomass into C. Most C accounting protocols, including those recently revised by the IPCC 5, utilize a default dead wood CF of 50%, but live tree studies suggest this assumption results in substantial bias in forest C estimates 6. Here we compile and analyze a global database of dead wood CFs in trees, showing that dead wood CFs average 48.5% across forests worldwide, deviating significantly from 50%, with systematic variation among biomes, plant phyla, tissue types, and decay classes. Accounting for data-driven dead wood CFs corrects systematic overestimates in global dead wood C stock estimates of ~1.6 Pg C, an estimate approaching annual C flux estimates from land-use change globally 7. Our analysis provides, for the first time, robust empirical CFs for dead wood globally to inform global terrestrial C accounting protocols, and revise estimates of forest C stocks and fluxes. |
| Databáze: | OpenAIRE |
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