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Annual balances of CH 4 and N 2 O from a managed fen meadow using eddy covariance flux measurements
Author(s) -
Kroon P. S.,
SchrierUijl A. P.,
Hensen A.,
Veenendaal E. M.,
Jonker H. J. J.
Publication year - 2010
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.2010.01273.x
Subject(s) - eddy covariance , flux (metallurgy) , atmospheric sciences , nitrous oxide , wind speed , greenhouse gas , environmental science , multivariate statistics , climatology , chemistry , meteorology , physics , ecosystem , mathematics , statistics , ecology , organic chemistry , biology , geology
Annual terrestrial balances of methane (CH 4 ) and nitrous oxide (N 2 O) are presented for a managed fen meadow in the Netherlands for 2006, 2007 and 2008, using eddy covariance (EC) flux measurements. Annual emissions derived from different methods are compared. The most accurate annual CH 4 flux is achieved by gap filling EC fluxes with an empirical multivariate regression model, with soil temperature and mean wind velocity as driving variables. This model explains about 60% of the variability in observed daily CH 4 fluxes. Annual N 2 O emissions can be separated into background emissions and event emissions due to fertilization. The background emission is estimated using a multivariate regression model also based on EC flux data, with soil temperature and mean wind velocity as driving variables. The event emissions are estimated using emission factors. The minimum direct emission factor is derived for six fertilization events by subtracting the background emission, and the IPCC default emission factor of 1% is used for the other events. In addition, the maximum direct emission factors are determined for the six events without subtracting the background emission. The average direct emission factor ranges from 1.2 to 2.8%, which is larger than the IPCC default value. Finally, the total terrestrial greenhouse gas balance is estimated at 16 Mg ha −1 year −1 in CO 2 ‐equivalents with contributions of 30, 25 and 45% by CO 2 , CH 4 and N 2 O, respectively.