Estimating the global root exudate carbon flux

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-07-09 DOI:10.1007/s10533-024-01161-z

Nikhil R. Chari, Shersingh Joseph Tumber-Dávila, Richard P. Phillips, Taryn L. Bauerle, Melanie Brunn, Benjamin D. Hafner, Tamir Klein, Sophie Obersteiner, Michaela K. Reay, Sami Ullah, Benton N. Taylor

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Abstract

Root exudation, the export of low-molecular weight organic carbon (C) from living plant roots to soil, influences microbial activity, nutrient availability, and ecosystem feedbacks to climate change, but the magnitude of this C flux at ecosystem and global scales is largely unknown. Here, we synthesize in situ measurements of root exudation rates and couple those to estimates of fine root biomass to estimate global and biome-level root exudate C fluxes. We estimate a global root exudate flux of 13.4 (10.1–20.2) Pg C y⁻¹, or about 9% (7–14%) of global annual gross primary productivity. We did not find differences in root mass-specific exudation rates among biomes, though total exudate fluxes are estimated to be greatest in grasslands owing to their high density of absorptive root biomass. Our synthesis highlights the global importance of root exudates in the terrestrial C cycle and identifies regions where more in situ measurements are needed to improve future estimates of root exudate C fluxes.

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估算全球根外渗碳通量

根系渗出是低分子量有机碳（C）从活体植物根系向土壤的输出，它影响着微生物活动、养分供应和生态系统对气候变化的反馈，但这种碳通量在生态系统和全球尺度上的大小在很大程度上是未知的。在这里，我们综合了对根系渗出率的现场测量结果，并将其与细根生物量的估计值结合起来，以估算全球和生物组水平的根系渗出碳通量。我们估计全球根外渗通量为 13.4 (10.1-20.2) Pg C y-1，约占全球年总初级生产力的 9% (7-14%)。我们没有发现不同生物群落的根系特定渗出率存在差异，但由于草地吸收性根系生物量密度高，估计草地的总渗出通量最大。我们的综述强调了根系渗出物在陆地碳循环中的全球重要性，并确定了需要进行更多现场测量的区域，以改进未来对根系渗出物碳通量的估计。

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来源期刊

Biogeochemistry 环境科学-地球科学综合

CiteScore

7.10

自引率

5.00%

发文量

112

审稿时长

3.2 months

期刊介绍： Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.