Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling
Nonstructural carbon (NSC) reserves act as buffers to sustain tree activity during periods when carbon (C) assimilation does not meet C demand, but little is known about their age and accessibility; we designed a controlled girdling experiment in the Amazon to study tree survival on NSC reserves. We...
| Autor principal: | Muhr, Jan |
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| Outros Autores: | Trumbore, Susan Elizabeth, Higuchi, Niro, Kunert, Norbert |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
New Phytologist
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/15604 |
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oai:repositorio:1-15604 |
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oai:repositorio:1-15604 Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling Muhr, Jan Trumbore, Susan Elizabeth Higuchi, Niro Kunert, Norbert Carbohydrate Carbon Dioxide Carbon Sequestration Experimental Study Radiocarbon Dating Remobilization Stem Survival Amazonia Carbon Carbon Dioxide Atmosphere Brasil Chemistry Metabolism Physiology Plant Stem Tree Atmosphere Brasil Carbon Carbon Dioxide Carbon Isotopes Plant Stems Trees Nonstructural carbon (NSC) reserves act as buffers to sustain tree activity during periods when carbon (C) assimilation does not meet C demand, but little is known about their age and accessibility; we designed a controlled girdling experiment in the Amazon to study tree survival on NSC reserves. We used bomb-radiocarbon (14C) to monitor the time elapsed between C fixation and release (‘age’ of substrates). We simultaneously monitored how the mobilization of reserve C affected δ13CO2. Six ungirdled control trees relied almost exclusively on recent assimilates throughout the 17 months of measurement. The Δ14C of CO2 emitted from the six girdled stems increased significantly over time after girdling, indicating substantial remobilization of storage NSC fixed up to 13–14 yr previously. This remobilization was not accompanied by a consistent change in observed δ13CO2. These trees have access to storage pools integrating C accumulated over more than a decade. Remobilization follows a very clear reverse chronological mobilization with younger reserve pools being mobilized first. The lack of a shift in the δ13CO2 might indicate a constant contribution of starch hydrolysis to the soluble sugar pool even outside pronounced stress periods (regular mixing). © 2018 The Authors. New Phytologist © 2018 New Phytologist Trust 2020-05-15T14:34:14Z 2020-05-15T14:34:14Z 2018 Artigo https://repositorio.inpa.gov.br/handle/1/15604 10.1111/nph.15302 en Volume 220, Número 1, Pags. 111-120 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf New Phytologist |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Carbohydrate Carbon Dioxide Carbon Sequestration Experimental Study Radiocarbon Dating Remobilization Stem Survival Amazonia Carbon Carbon Dioxide Atmosphere Brasil Chemistry Metabolism Physiology Plant Stem Tree Atmosphere Brasil Carbon Carbon Dioxide Carbon Isotopes Plant Stems Trees |
| spellingShingle |
Carbohydrate Carbon Dioxide Carbon Sequestration Experimental Study Radiocarbon Dating Remobilization Stem Survival Amazonia Carbon Carbon Dioxide Atmosphere Brasil Chemistry Metabolism Physiology Plant Stem Tree Atmosphere Brasil Carbon Carbon Dioxide Carbon Isotopes Plant Stems Trees Muhr, Jan Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| topic_facet |
Carbohydrate Carbon Dioxide Carbon Sequestration Experimental Study Radiocarbon Dating Remobilization Stem Survival Amazonia Carbon Carbon Dioxide Atmosphere Brasil Chemistry Metabolism Physiology Plant Stem Tree Atmosphere Brasil Carbon Carbon Dioxide Carbon Isotopes Plant Stems Trees |
| description |
Nonstructural carbon (NSC) reserves act as buffers to sustain tree activity during periods when carbon (C) assimilation does not meet C demand, but little is known about their age and accessibility; we designed a controlled girdling experiment in the Amazon to study tree survival on NSC reserves. We used bomb-radiocarbon (14C) to monitor the time elapsed between C fixation and release (‘age’ of substrates). We simultaneously monitored how the mobilization of reserve C affected δ13CO2. Six ungirdled control trees relied almost exclusively on recent assimilates throughout the 17 months of measurement. The Δ14C of CO2 emitted from the six girdled stems increased significantly over time after girdling, indicating substantial remobilization of storage NSC fixed up to 13–14 yr previously. This remobilization was not accompanied by a consistent change in observed δ13CO2. These trees have access to storage pools integrating C accumulated over more than a decade. Remobilization follows a very clear reverse chronological mobilization with younger reserve pools being mobilized first. The lack of a shift in the δ13CO2 might indicate a constant contribution of starch hydrolysis to the soluble sugar pool even outside pronounced stress periods (regular mixing). © 2018 The Authors. New Phytologist © 2018 New Phytologist Trust |
| format |
Artigo |
| author |
Muhr, Jan |
| author2 |
Trumbore, Susan Elizabeth Higuchi, Niro Kunert, Norbert |
| author2Str |
Trumbore, Susan Elizabeth Higuchi, Niro Kunert, Norbert |
| title |
Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| title_short |
Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| title_full |
Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| title_fullStr |
Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| title_full_unstemmed |
Living on borrowed time – Amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| title_sort |
living on borrowed time – amazonian trees use decade-old storage carbon to survive for months after complete stem girdling |
| publisher |
New Phytologist |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/15604 |
| _version_ |
1787141133117161472 |
| score |
11.755432 |