Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study
Abstract
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 (Cm) 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 Cm, whereas N addition usually reduced Cm, 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 Cm for most soils when compared to C additions alone, suggesting that microbialmore »
- Authors:
-
[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)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1560501
- Alternate Identifier(s):
- OSTI ID: 1581042
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- European Journal of Soil Science
- Additional Journal Information:
- Journal Volume: 70; Journal Issue: 5; Journal ID: ISSN 1351-0754
- Publisher:
- Wiley - British Society of Soil Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Gompertz model; Nutrient addition; Soil CO2 emission; Soil incubation; Tropical forest
Citation Formats
Hui, Dafeng, Porter, Wesley S., Phillips, Jana Randolph, Aidar, Marcos Pereira Marinho, Lebreux, Steven J., Schadt, Christopher Warren, and Mayes, Melanie A. Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study. United States: N. p., 2019.
Web. https://doi.org/10.1111/ejss.12885.
Hui, Dafeng, Porter, Wesley S., Phillips, Jana Randolph, Aidar, Marcos Pereira Marinho, Lebreux, Steven J., Schadt, Christopher Warren, & Mayes, Melanie A. Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study. United States. https://doi.org/10.1111/ejss.12885
Hui, Dafeng, Porter, Wesley S., Phillips, Jana Randolph, Aidar, Marcos Pereira Marinho, Lebreux, Steven J., Schadt, Christopher Warren, and Mayes, Melanie A. Thu .
"Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study". United States. https://doi.org/10.1111/ejss.12885. https://www.osti.gov/servlets/purl/1560501.
@article{osti_1560501,
title = {Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study},
author = {Hui, Dafeng and Porter, Wesley S. and Phillips, Jana Randolph and Aidar, Marcos Pereira Marinho and Lebreux, Steven J. and Schadt, Christopher Warren and Mayes, Melanie A.},
abstractNote = {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 (Cm) 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 Cm, whereas N addition usually reduced Cm, 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 Cm 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.},
doi = {10.1111/ejss.12885},
journal = {European Journal of Soil Science},
number = 5,
volume = 70,
place = {United States},
year = {2019},
month = {8}
}
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