Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency
Understanding how tropical forest carbon balance will respond to global change requires knowledge of individual heterotrophic and autotrophic respiratory sources, together with factors that control respiratory variability. We measured leaf, live wood, and soil respiration, along with additional envi...
| Autor principal: | Chambers, Jeffrey Quintin |
|---|---|
| Outros Autores: | Tribuzy, Edgard Siza, Toledo, Ligia C., Crispim, Bianca F., Higuchi, Niro, Santos, Joaquim dos, Araüjo, Alessandro Carioca de, Kruijt, Bart J., Nobre, Antônio Donato, Trumbore, Susan Elizabeth |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Ecological Applications
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/18902 |
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oai:repositorio:1-18902 |
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oai:repositorio:1-18902 Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency Chambers, Jeffrey Quintin Tribuzy, Edgard Siza Toledo, Ligia C. Crispim, Bianca F. Higuchi, Niro Santos, Joaquim dos Araüjo, Alessandro Carioca de Kruijt, Bart J. Nobre, Antônio Donato Trumbore, Susan Elizabeth Carbon Balance Global Change Net Ecosystem Exchange Net Primary Production Nutrient Use Efficiency Respiration Soil Respiration Tropical Forest Amazonia South America Understanding how tropical forest carbon balance will respond to global change requires knowledge of individual heterotrophic and autotrophic respiratory sources, together with factors that control respiratory variability. We measured leaf, live wood, and soil respiration, along with additional environmental factors over a 1-yr period in a Central Amazon terra firme forest. Scaling these fluxes to the ecosystem, and combining our data with results from other studies, we estimated an average total ecosystem respiration (R eco) of 7.8 μmol·m-2·s-1. Average estimates (per unit ground area) for leaf, wood, soil, total heterotrophic, and total autotrophic respiration were 2.6, 1.1, 3.2, 5.6, and 2.2 μmol·m-2·s-1, respectively. Comparing autotrophic respiration with net primary production (NPP) estimates indicated that only ∼30% of carbon assimilated in photosynthesis was used to construct new tissues, with the remaining 70% being respired back to the atmosphere as autotrophic respiration. This low ecosystem carbon use efficiency (CUE) differs considerably from the relatively constant CUE of ∼0.5 found for temperate forests. Our Reco estimate was comparable to the above-canopy flux (Fac) from eddy covariance during defined sustained high turbulence conditions (when presumably Fac = Reco) of 8.4 (95% CI = 7.5-9.4). Multiple regression analysis demonstrated that ∼50% of the nighttime variability in Fac was accounted for by friction velocity (u*, a measure of turbulence) variables. After accounting for u* variability, mean Fac varied significantly with seasonal and daily changes in precipitation. A seasonal increase in precipitation resulted in a decrease in Fac, similar to our soil respiration response to moisture. The effect of daily changes in precipitation was complex: precipitation after a dry period resulted in a large increase in Fac, whereas additional precipitation after a rainy period had little effect. This response was similar to that of surface litter (coarse and fine), where respiration is greatly reduced when moisture is limiting, but increases markedly and quickly saturates with an increase in moisture. 2020-06-15T22:03:48Z 2020-06-15T22:03:48Z 2004 Artigo https://repositorio.inpa.gov.br/handle/1/18902 en Volume 14, Número 4 SUPPL., Pags. S72-S88 Restrito Ecological Applications |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Carbon Balance Global Change Net Ecosystem Exchange Net Primary Production Nutrient Use Efficiency Respiration Soil Respiration Tropical Forest Amazonia South America |
| spellingShingle |
Carbon Balance Global Change Net Ecosystem Exchange Net Primary Production Nutrient Use Efficiency Respiration Soil Respiration Tropical Forest Amazonia South America Chambers, Jeffrey Quintin Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency |
| topic_facet |
Carbon Balance Global Change Net Ecosystem Exchange Net Primary Production Nutrient Use Efficiency Respiration Soil Respiration Tropical Forest Amazonia South America |
| description |
Understanding how tropical forest carbon balance will respond to global change requires knowledge of individual heterotrophic and autotrophic respiratory sources, together with factors that control respiratory variability. We measured leaf, live wood, and soil respiration, along with additional environmental factors over a 1-yr period in a Central Amazon terra firme forest. Scaling these fluxes to the ecosystem, and combining our data with results from other studies, we estimated an average total ecosystem respiration (R eco) of 7.8 μmol·m-2·s-1. Average estimates (per unit ground area) for leaf, wood, soil, total heterotrophic, and total autotrophic respiration were 2.6, 1.1, 3.2, 5.6, and 2.2 μmol·m-2·s-1, respectively. Comparing autotrophic respiration with net primary production (NPP) estimates indicated that only ∼30% of carbon assimilated in photosynthesis was used to construct new tissues, with the remaining 70% being respired back to the atmosphere as autotrophic respiration. This low ecosystem carbon use efficiency (CUE) differs considerably from the relatively constant CUE of ∼0.5 found for temperate forests. Our Reco estimate was comparable to the above-canopy flux (Fac) from eddy covariance during defined sustained high turbulence conditions (when presumably Fac = Reco) of 8.4 (95% CI = 7.5-9.4). Multiple regression analysis demonstrated that ∼50% of the nighttime variability in Fac was accounted for by friction velocity (u*, a measure of turbulence) variables. After accounting for u* variability, mean Fac varied significantly with seasonal and daily changes in precipitation. A seasonal increase in precipitation resulted in a decrease in Fac, similar to our soil respiration response to moisture. The effect of daily changes in precipitation was complex: precipitation after a dry period resulted in a large increase in Fac, whereas additional precipitation after a rainy period had little effect. This response was similar to that of surface litter (coarse and fine), where respiration is greatly reduced when moisture is limiting, but increases markedly and quickly saturates with an increase in moisture. |
| format |
Artigo |
| author |
Chambers, Jeffrey Quintin |
| author2 |
Tribuzy, Edgard Siza Toledo, Ligia C. Crispim, Bianca F. Higuchi, Niro Santos, Joaquim dos Araüjo, Alessandro Carioca de Kruijt, Bart J. Nobre, Antônio Donato Trumbore, Susan Elizabeth |
| author2Str |
Tribuzy, Edgard Siza Toledo, Ligia C. Crispim, Bianca F. Higuchi, Niro Santos, Joaquim dos Araüjo, Alessandro Carioca de Kruijt, Bart J. Nobre, Antônio Donato Trumbore, Susan Elizabeth |
| title |
Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency |
| title_short |
Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency |
| title_full |
Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency |
| title_fullStr |
Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency |
| title_full_unstemmed |
Respiration from a tropical forest ecosystem: Partitioning of sources and low carbon use efficiency |
| title_sort |
respiration from a tropical forest ecosystem: partitioning of sources and low carbon use efficiency |
| publisher |
Ecological Applications |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18902 |
| _version_ |
1787145435998060544 |
| score |
11.653393 |