Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime
This study comprises field experiments on methane emissions from rice fields conducted with an Eddy-Covariance (EC) system as well as test runs for a modified closed chamber approach based on measurements at nighttime. The EC data set covers 4 cropping seasons with highly resolved emission rates (ra...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Public Library of Science
2018
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/98235 |
| _version_ | 1855540843480350720 |
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| author | Wassmann, Reiner Alberto, Ma.Carmelita Tirol-Padre, Agnes Hoang, Nghia Trong Romasanta, Ryan Centeno, Caesar Arloo Sander, Bjoern Ole |
| author_browse | Alberto, Ma.Carmelita Centeno, Caesar Arloo Hoang, Nghia Trong Romasanta, Ryan Sander, Bjoern Ole Tirol-Padre, Agnes Wassmann, Reiner |
| author_facet | Wassmann, Reiner Alberto, Ma.Carmelita Tirol-Padre, Agnes Hoang, Nghia Trong Romasanta, Ryan Centeno, Caesar Arloo Sander, Bjoern Ole |
| author_sort | Wassmann, Reiner |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | This study comprises field experiments on methane emissions from rice fields conducted with an Eddy-Covariance (EC) system as well as test runs for a modified closed chamber approach based on measurements at nighttime. The EC data set covers 4 cropping seasons with highly resolved emission rates (raw data in 10 Hz frequency have been aggregated to 30-min records). The diel patterns were very pronounced in the two dry seasons with peak emissions at early afternoon and low emissions at nighttime. These diel patterns were observed at all growing stages of the dry seasons. In the two wet seasons, the diel patterns were only visible during the vegetative stages while emission rates during reproductive and ripening stages remained within a fairly steady range and did not show any diel patterns. In totality, however, the data set revealed a very strong linear relationship between nocturnal emissions (12-h periods) and the full 24-h periods resulting in an R2-value of 0.8419 for all data points. In the second experiment, we conducted test runs for chamber measurements at nighttime with much longer deployment times (6 h) as compared to measurements at daylight (typically for 30 min). Conducting chamber measurements at nighttime excluded drastic changes of temperatures and CO2 concentrations. The data also shows that increases in CH4 concentrations remained on linear trajectory over a 6h period at night. While end CH4 concentrations were consistently >3.5 ppm, this long-term enclosure represents a very robust approach to quantify emissions as compared to assessing short-term concentration increases over time near the analytical detection limit. Finally, we have discussed the potential applications of this new approach that would allow emission measurements even when conventional (daytime) measurements will not be suitable. Nighttime chamber measurements offer an alternative to conventional (daytime) measurements if either (i) baseline emissions are at a very low level, (ii) differences of tested crop treatments or varieties are very small or (iii) the objective is to screen a large number of rice varieties for taking advantage of progress in genome sequencing. |
| format | Journal Article |
| id | CGSpace98235 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Public Library of Science |
| publisherStr | Public Library of Science |
| record_format | dspace |
| spelling | CGSpace982352026-01-06T12:03:49Z Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime Wassmann, Reiner Alberto, Ma.Carmelita Tirol-Padre, Agnes Hoang, Nghia Trong Romasanta, Ryan Centeno, Caesar Arloo Sander, Bjoern Ole climate change food security agriculture rice emission methane methane emission This study comprises field experiments on methane emissions from rice fields conducted with an Eddy-Covariance (EC) system as well as test runs for a modified closed chamber approach based on measurements at nighttime. The EC data set covers 4 cropping seasons with highly resolved emission rates (raw data in 10 Hz frequency have been aggregated to 30-min records). The diel patterns were very pronounced in the two dry seasons with peak emissions at early afternoon and low emissions at nighttime. These diel patterns were observed at all growing stages of the dry seasons. In the two wet seasons, the diel patterns were only visible during the vegetative stages while emission rates during reproductive and ripening stages remained within a fairly steady range and did not show any diel patterns. In totality, however, the data set revealed a very strong linear relationship between nocturnal emissions (12-h periods) and the full 24-h periods resulting in an R2-value of 0.8419 for all data points. In the second experiment, we conducted test runs for chamber measurements at nighttime with much longer deployment times (6 h) as compared to measurements at daylight (typically for 30 min). Conducting chamber measurements at nighttime excluded drastic changes of temperatures and CO2 concentrations. The data also shows that increases in CH4 concentrations remained on linear trajectory over a 6h period at night. While end CH4 concentrations were consistently >3.5 ppm, this long-term enclosure represents a very robust approach to quantify emissions as compared to assessing short-term concentration increases over time near the analytical detection limit. Finally, we have discussed the potential applications of this new approach that would allow emission measurements even when conventional (daytime) measurements will not be suitable. Nighttime chamber measurements offer an alternative to conventional (daytime) measurements if either (i) baseline emissions are at a very low level, (ii) differences of tested crop treatments or varieties are very small or (iii) the objective is to screen a large number of rice varieties for taking advantage of progress in genome sequencing. 2018-02-01 2018-11-16T16:03:47Z 2018-11-16T16:03:47Z Journal Article https://hdl.handle.net/10568/98235 en Open Access Public Library of Science Wassmann R, Alberto MC, Tirol-Padre A, Hoang NT, Romasanta R, Centeno CA, Ole Sander B. 2018. Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime. PLoS ONE 13(2). |
| spellingShingle | climate change food security agriculture rice emission methane methane emission Wassmann, Reiner Alberto, Ma.Carmelita Tirol-Padre, Agnes Hoang, Nghia Trong Romasanta, Ryan Centeno, Caesar Arloo Sander, Bjoern Ole Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime |
| title | Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime |
| title_full | Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime |
| title_fullStr | Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime |
| title_full_unstemmed | Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime |
| title_short | Increasing sensitivity of methane emission measurements in rice through deployment of ‘closed chambers’ at nighttime |
| title_sort | increasing sensitivity of methane emission measurements in rice through deployment of closed chambers at nighttime |
| topic | climate change food security agriculture rice emission methane methane emission |
| url | https://hdl.handle.net/10568/98235 |
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