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Uncertainty in inventory based NEP estimates

Uncertainty in inventory based NEP estimates. C-balance method (NPP-Rh) 5 to10 years Plot level Process understanding . C-stock method - 10 years Plot level, national inventories Inventory. Assume a valid sampling sheme Dificult to clearly distinguish random and systematic errors.

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Uncertainty in inventory based NEP estimates

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  1. Uncertainty in inventory based NEP estimates • C-balance method (NPP-Rh) • 5 to10 years • Plot level • Process understanding • C-stock method • - 10 years • Plot level, national inventories • Inventory • Assume a valid sampling sheme • Dificult to clearly distinguish random and systematic errors

  2. Foliage A B C Stem D E Reproductive parts Branches Herbivory Non-CO2 losses Coarse roots Fine roots Mycorrhizae Understory Heterotrophic respiration C-balance method Components Random Systematic

  3. Foliage A B C Stem D E Reproductive parts Branches Herbivory Non-CO2 losses Coarse roots Fine roots Mycorrhizae Understory Heterotrophic respiration C-balance method Components Random Systematic

  4. How to measure and reduce the uncertainty ? • C-balance method (NPP-Rh) • Repeated measurements, error progagation, permutation techniques and harmonization • Fine root NPP: root turnover • Mycorryzhae: separate from roots/soil • Heterotrophic respiration: direct measurement

  5. Foliage A Stem B C Branches Coarse roots D Detritus E Understory Soil C-stock method Components Random Systematic

  6. Foliage A Stem B C Branches Coarse roots D Detritus E Understory Soil C-stock method Components Random Systematic

  7. How to measure and reduce the uncertainty ? • C-stock method • Repeated measurements, error progagation, permutation techniques, harmonization • Detritus: understand the heterogenity • Soil: understand the heterogenity

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