Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study

Hui, Dafeng; Porter, Wesley S.; Phillips, Jana Randolph; Aidar, Marcos Pereira  Marinho; Lebreux, Steven J.; Schadt, Christopher Warren; Mayes, Melanie A.

doi:10.1111/ejss.12885

Title: Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study

Journal Article · 28 August 2019 · European Journal of Soil Science

DOI: https://doi.org/10.1111/ejss.12885 · OSTI ID:1560501

Hui, Dafeng ^[1]; Porter, Wesley S. ^[2]; Phillips, Jana Randolph ^[2]; Aidar, Marcos Pereira Marinho ^[3]; Lebreux, Steven J. ^[2];

^[2];

^[2]

Tennessee State Univ., Nashville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Inst. of Botany, Sao Paulo (Brazil)

Ecosystem functional responses such as soil CO₂ emissions are constrained by microclimate, available carbon (C) substrates and their effects upon microbial activity. In tropical forests, phosphorus (P) is often considered as a limiting factor for plant growth, but it is still not clear whether P constrains microbial CO₂ emissions from soils. In this study, we incubated seven tropical forest soils from Brazil and Puerto Rico with different nutrient addition treatments (no addition - Control, C, nitrogen (N) or P addition only; and combined C, N, and P addition (CNP)). Cumulative soil CO₂ emissions were fit with a Gompertz model to estimate potential maximum cumulative soil CO₂ emission (C_m) and the rate of change of soil C decomposition (k). Quantitative polymerase chain reaction (qPCR) was conducted to quantify microbial biomass as bacteria and fungi. Results showed that P addition alone or in combination with C and N enhanced C_m, whereas N addition usually reduced C_m, and neither N nor P affected microbial biomass. Additions of CNP enhanced k, increased microbial abundances and altered fungal to bacterial ratios towards higher fungal abundance. Additions of CNP, however, tended to reduce C_m for most soils when compared to C additions alone, suggesting that microbial growth associated with nutrient additions may have occurred at the expense of C decomposition. Altogether, this study demonstrates that soil CO₂ emission is more limited by P than N in tropical forest soils and those effects were stronger in soils low in P.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1560501

Alternate ID(s):: OSTI ID: 1581042

Journal Information:: European Journal of Soil Science, Journal Name: European Journal of Soil Science Journal Issue: 5 Vol. 70; ISSN 1351-0754

Publisher:: Wiley - British Society of Soil ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
Gompertz model
Nutrient addition
Soil CO2 emission
Soil incubation
Tropical forest

Title: Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study

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Title: Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study