Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama
Tropical lowland forest soils are significant sources and sinks of trace gases. In order to model soil trace gas flux for future climate scenarios, it is necessary to be able to predict changes in soil trace gas fluxes along natural gradients of soil fertility and climatic characteristics. We qu...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-07-01
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| Series: | Biogeosciences |
| Online Access: | https://www.biogeosciences.net/14/3509/2017/bg-14-3509-2017.pdf |
| _version_ | 1811193868917407744 |
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| author | A. L. Matson A. L. Matson M. D. Corre M. D. Corre K. Langs E. Veldkamp |
| author_facet | A. L. Matson A. L. Matson M. D. Corre M. D. Corre K. Langs E. Veldkamp |
| author_sort | A. L. Matson |
| collection | DOAJ |
| description | Tropical lowland forest soils are significant sources and
sinks of trace gases. In order to model soil trace gas flux for future
climate scenarios, it is necessary to be able to predict changes in soil
trace gas fluxes along natural gradients of soil fertility and climatic
characteristics. We quantified trace gas fluxes in lowland forest soils at
five locations in Panama, which encompassed orthogonal precipitation and soil
fertility gradients. Soil trace gas fluxes were measured monthly for 1 (NO)
or 2 (CO<sub>2</sub>, CH<sub>4</sub>, N<sub>2</sub>O) years (2010–2012) using vented
dynamic (for NO only) or static chambers with permanent bases. Across the
five sites, annual fluxes ranged from 8.0 to 10.2 Mg
CO<sub>2</sub>-C, −2.0 to −0.3 kg
CH<sub>4</sub>-C, 0.4 to 1.3 kg N<sub>2</sub>O-N
and −0.82 to −0.03 kg NO-N ha<sup>−1</sup> yr<sup>−1</sup>.
Soil CO<sub>2</sub> emissions did not differ across sites, but they did exhibit clear
seasonal differences and a parabolic pattern with soil moisture across sites.
All sites were CH<sub>4</sub> sinks; within-site fluxes were largely controlled by
soil moisture, whereas fluxes across sites were positively correlated with an
integrated index of soil fertility. Soil N<sub>2</sub>O fluxes were low throughout
the measurement years, but the highest emissions occurred at a mid-precipitation
site with high soil N availability. Net negative NO fluxes at the soil
surface occurred at all sites, with the most negative fluxes at the
low-precipitation site closest to Panama City; this was likely due to high
ambient NO concentrations from anthropogenic sources. Our study highlights
the importance of both short-term (climatic) and long-term (soil and site
characteristics) factors in predicting soil trace gas fluxes. |
| first_indexed | 2024-04-12T00:17:49Z |
| format | Article |
| id | doaj.art-26fce8534bde49a58460c9bff903b788 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-04-12T00:17:49Z |
| publishDate | 2017-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-26fce8534bde49a58460c9bff903b7882022-12-22T03:55:48ZengCopernicus PublicationsBiogeosciences1726-41701726-41892017-07-01143509352410.5194/bg-14-3509-2017Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of PanamaA. L. Matson0A. L. Matson1M. D. Corre2M. D. Corre3K. Langs4E. Veldkamp5Soil Science of Tropical and Subtropical Ecosystems, University of Goettingen, Buesgenweg 2, 37077 Goettingen, GermanyThese authors contributed equally to this work.Soil Science of Tropical and Subtropical Ecosystems, University of Goettingen, Buesgenweg 2, 37077 Goettingen, GermanyThese authors contributed equally to this work.Soil Science of Tropical and Subtropical Ecosystems, University of Goettingen, Buesgenweg 2, 37077 Goettingen, GermanySoil Science of Tropical and Subtropical Ecosystems, University of Goettingen, Buesgenweg 2, 37077 Goettingen, GermanyTropical lowland forest soils are significant sources and sinks of trace gases. In order to model soil trace gas flux for future climate scenarios, it is necessary to be able to predict changes in soil trace gas fluxes along natural gradients of soil fertility and climatic characteristics. We quantified trace gas fluxes in lowland forest soils at five locations in Panama, which encompassed orthogonal precipitation and soil fertility gradients. Soil trace gas fluxes were measured monthly for 1 (NO) or 2 (CO<sub>2</sub>, CH<sub>4</sub>, N<sub>2</sub>O) years (2010–2012) using vented dynamic (for NO only) or static chambers with permanent bases. Across the five sites, annual fluxes ranged from 8.0 to 10.2 Mg CO<sub>2</sub>-C, −2.0 to −0.3 kg CH<sub>4</sub>-C, 0.4 to 1.3 kg N<sub>2</sub>O-N and −0.82 to −0.03 kg NO-N ha<sup>−1</sup> yr<sup>−1</sup>. Soil CO<sub>2</sub> emissions did not differ across sites, but they did exhibit clear seasonal differences and a parabolic pattern with soil moisture across sites. All sites were CH<sub>4</sub> sinks; within-site fluxes were largely controlled by soil moisture, whereas fluxes across sites were positively correlated with an integrated index of soil fertility. Soil N<sub>2</sub>O fluxes were low throughout the measurement years, but the highest emissions occurred at a mid-precipitation site with high soil N availability. Net negative NO fluxes at the soil surface occurred at all sites, with the most negative fluxes at the low-precipitation site closest to Panama City; this was likely due to high ambient NO concentrations from anthropogenic sources. Our study highlights the importance of both short-term (climatic) and long-term (soil and site characteristics) factors in predicting soil trace gas fluxes.https://www.biogeosciences.net/14/3509/2017/bg-14-3509-2017.pdf |
| spellingShingle | A. L. Matson A. L. Matson M. D. Corre M. D. Corre K. Langs E. Veldkamp Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama Biogeosciences |
| title | Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama |
| title_full | Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama |
| title_fullStr | Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama |
| title_full_unstemmed | Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama |
| title_short | Soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of Panama |
| title_sort | soil trace gas fluxes along orthogonal precipitation and soil fertility gradients in tropical lowland forests of panama |
| url | https://www.biogeosciences.net/14/3509/2017/bg-14-3509-2017.pdf |
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