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Modeling Global Carbon Costs of Plant Nitrogen and Phosphorus Acquisition by R. K. Braghiere; J. B. Fisher; K. Allen; E. Brzostek; M. Shi; X. Yang; D. M. Ricciuto; R. A. Fisher; Q. Zhu; R. P. Phillips is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract Most Earth system models (ESMs) do not explicitly represent the carbon (C) costs of plant nutrient acquisition, which leads to uncertainty in predictions of the current and future constraints to the land C sink. We integrate a plant productivity‐optimizing nitrogen (N) and phosphorus (P) acquisition model (fixation & uptake of nutrients, FUN) into the energy exascale Earth system (E3SM) land model (ELM). Global plant N and P uptake are dynamically simulated by ELM‐FUN based on the C costs of nutrient acquisition from mycorrhizae, direct root uptake, retranslocation from senescing leaves, and biological N fixation. We benchmarked ELM‐FUN with three classes of products: ILAMB, a remotely sensed nutrient limitation product, and CMIP6 models; we found significant improvements in C cycle variables, although the lack of more observed nutrient data prevents a comprehensive level of benchmarking. Overall, we found N and P co‐limitation for 80% of land area, with the remaining 20% being either predominantly N or P limited. Globally, the new model predicts that plants invested 4.1 Pg C yr^−1^ to acquire 841.8 Tg N yr^−1^ and 48.1 Tg P yr^−1^ (1994–2005), leading to significant do

Who reads Modeling Global Carbon Costs of Plant Nitrogen and Phosphorus Acquisition?

Author

R. K. Braghiere; J. B. Fisher; K. Allen; E. Brzostek; M. Shi; X. Yang; D. M. Ricciuto; R. A. Fisher; Q. Zhu; R. P. Phillips

Publisher

American Geophysical Union (AGU)

Published

2022

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)