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Title: 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 » 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.« less

Authors:
 [1];  [2];  [2];  [3];  [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Tennessee State Univ., Nashville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. 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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