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Author  |
Rowland, L.; Stahl, C.; Bonal, D.; Siebicke, L.; Williams, M.; Meir, P. |
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Title |
The Response of Tropical Rainforest Dead Wood Respiration to Seasonal Drought |
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Journal Article |
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Year |
2013 |
Publication |
Ecosystems |
Abbreviated Journal |
Ecosystems |
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16 |
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7 |
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1294-1309 |
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Keywords |
Amazon rainforest; coarse woody debris; respiration; seasonal drought; soil water content; woody moisture content |
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Abstract |
Coarse woody debris (CWD, dead wood sections ≥10 cm diameter) represents a large store of carbon in tropical forests; however, estimates of the flux of carbon from CWD in these forests remain poorly constrained. The objective of this study was to resolve the dry/wet season response of respiration in CWD (Rcwd), and investigate the importance of biotic and abiotic factors for predicting the seasonal change of Rcwd at the ecosystem level. This study presents a 4-month time series of Rcwd measurements conducted on 42 dead trees (26 species) at the Paracou Research Station in French Guiana. Rcwd measurements were repeated 13 times on each CWD sample from July to November 2011, spanning the transition from wet to dry season, and then from dry season to the following wet season. Seasonal drought caused monthly Rcwd to drop by 20.5 ± 5.1% over the wet-dry transition. Changes in woody tissue moisture content explained 41.9% of the measured seasonal variability in Rcwd, but 60% of the seasonal variability in mean forest Rcwd rates could be modelled using surface soil water content. We estimate that Rcwd is approximately 5% of annual ecosystem respiration (Reco) and that seasonal variations in Rcwd contribute appreciably to seasonal variations of Reco, and should be included in functional models simulating the response of tropical rainforest ecosystems to current and future climate. © 2013 Springer Science+Business Media New York. |
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Division of Plant Sciences, Research School of Biology, The Australian National University, ACT, Australian Capital Territory, 0200, Australia |
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14329840 (Issn) |
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Notes |
Export Date: 18 October 2013; Source: Scopus; Coden: Ecosf; doi: 10.1007/s10021-013-9684-x; Language of Original Document: English; Correspondence Address: Rowland, L.; School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom; email: lucy.rowland@ed.ac.uk; Funding Details: NE/F002149/1, NERC, Natural Environment Research Council; Funding Details: NE/J011002/1, NERC, Natural Environment Research Council; Funding Details: FT110100457, ARC, Australian Research Council |
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EcoFoG @ webmaster @ |
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506 |
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