Radiocarbon-Based Partitioning of Soil Respiration in an Old-Growth Coniferous Forest
Abstract
Temperate forests play an important role in the global carbon cycle, and are thought to currently be a sink for atmospheric CO2. However, we lack understanding of the drivers of forest carbon accumulation and loss, hampering our ability to predict carbon cycle responses to global change. In this study, we used CO2 flux and radiocarbon (14C) measurements to investigate the role of seasonal drivers on soil respiration. Radiocarbon measurements of CO2 evolved during incubation of fine roots and root-free soils at the beginning and end of the growing season (April and August) showed that these two soil respiration sources (fine roots vis-à-vis soils) have different mean residence times that stayed constant between seasons. Radiocarbon measurements show that root respiration was made up of carbon fixed 3–5 years prior to sampling, and that heterotrophic respiration was made up of carbon fixed 7–10 years prior. The difference in radiocarbon signature between the two sources allowed us to partition autotrophic and heterotrophic respiration sources for soil respiration measurements in the field. We observed a small but significant increase in Δ14C of soil respiration between April and August, suggesting an increase in heterotrophic respiration sources over the growing season. Using a two end-member mixingmore »
- Authors:
-
- San Diego State Univ., CA (United States)
- Univ. of California, Irvine, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Washington, Carson, WA (United States). Wind River Field Station
- Oregon State Univ., Corvallis, OR (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1837818
- Report Number(s):
- LLNL-JRNL-690543
Journal ID: ISSN 1432-9840; 818397
- Grant/Contract Number:
- AC52-07NA27344; SC0005266
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ecosystems
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 3; Journal ID: ISSN 1432-9840
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; soil CO2 flux; radiocarbon; root respiration; residence time of soil carbon; stored carbon; photosynthates
Citation Formats
Taylor, Adam J., Lai, Chun-Ta, Hopkins, Francesca M., Wharton, Sonia, Bible, Ken, Xu, Xiaomei, Phillips, Claire, Bush, Susan, and Ehleringer, James R. Radiocarbon-Based Partitioning of Soil Respiration in an Old-Growth Coniferous Forest. United States: N. p., 2015.
Web. doi:10.1007/s10021-014-9839-4.
Taylor, Adam J., Lai, Chun-Ta, Hopkins, Francesca M., Wharton, Sonia, Bible, Ken, Xu, Xiaomei, Phillips, Claire, Bush, Susan, & Ehleringer, James R. Radiocarbon-Based Partitioning of Soil Respiration in an Old-Growth Coniferous Forest. United States. https://doi.org/10.1007/s10021-014-9839-4
Taylor, Adam J., Lai, Chun-Ta, Hopkins, Francesca M., Wharton, Sonia, Bible, Ken, Xu, Xiaomei, Phillips, Claire, Bush, Susan, and Ehleringer, James R. Wed .
"Radiocarbon-Based Partitioning of Soil Respiration in an Old-Growth Coniferous Forest". United States. https://doi.org/10.1007/s10021-014-9839-4. https://www.osti.gov/servlets/purl/1837818.
@article{osti_1837818,
title = {Radiocarbon-Based Partitioning of Soil Respiration in an Old-Growth Coniferous Forest},
author = {Taylor, Adam J. and Lai, Chun-Ta and Hopkins, Francesca M. and Wharton, Sonia and Bible, Ken and Xu, Xiaomei and Phillips, Claire and Bush, Susan and Ehleringer, James R.},
abstractNote = {Temperate forests play an important role in the global carbon cycle, and are thought to currently be a sink for atmospheric CO2. However, we lack understanding of the drivers of forest carbon accumulation and loss, hampering our ability to predict carbon cycle responses to global change. In this study, we used CO2 flux and radiocarbon (14C) measurements to investigate the role of seasonal drivers on soil respiration. Radiocarbon measurements of CO2 evolved during incubation of fine roots and root-free soils at the beginning and end of the growing season (April and August) showed that these two soil respiration sources (fine roots vis-à-vis soils) have different mean residence times that stayed constant between seasons. Radiocarbon measurements show that root respiration was made up of carbon fixed 3–5 years prior to sampling, and that heterotrophic respiration was made up of carbon fixed 7–10 years prior. The difference in radiocarbon signature between the two sources allowed us to partition autotrophic and heterotrophic respiration sources for soil respiration measurements in the field. We observed a small but significant increase in Δ14C of soil respiration between April and August, suggesting an increase in heterotrophic respiration sources over the growing season. Using a two end-member mixing model, we estimate that 55 ± 22% of soil respiration originated from autotrophic (root) sources in April, but their contribution dropped to 38 ± 21% in August. Overall, these findings suggest that the contribution of root respiration increases at a time of high productivity and/or as a result of relatively low microbial respiration in the early spring in this old-growth coniferous forest.},
doi = {10.1007/s10021-014-9839-4},
journal = {Ecosystems},
number = 3,
volume = 18,
place = {United States},
year = {Wed Jan 21 00:00:00 EST 2015},
month = {Wed Jan 21 00:00:00 EST 2015}
}
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