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Responses of CO 2 , N 2 O and CH 4 fluxes between atmosphere and forest soil to changes in multiple environmental conditions
Author(s) -
Yan Junhua,
Zhang Wei,
Wang Keya,
Qin Fen,
Wang Wantong,
Dai Huitang,
Li Peixue
Publication year - 2014
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1111/gcb.12327
Subject(s) - greenhouse gas , environmental science , in situ , nitrogen , environmental chemistry , atmosphere (unit) , soil water , chemistry , soil science , ecology , physics , biology , organic chemistry , thermodynamics
To investigate the effects of multiple environmental conditions on greenhouse gas ( CO 2 , N 2 O , CH 4 ) fluxes, we transferred three soil monoliths from Masson pine forest ( PF ) or coniferous and broadleaved mixed forest ( MF ) at Jigongshan to corresponding forest type at Dinghushan. Greenhouse gas fluxes at the in situ (Jigongshan), transported and ambient (Dinghushan) soil monoliths were measured using static chambers. When the transported soil monoliths experienced the external environmental factors (temperature, precipitation and nitrogen deposition) at Dinghushan, its annual soil CO 2 emissions were 54% in PF and 60% in MF higher than those from the respective in situ treatment. Annual soil N 2 O emissions were 45% in PF and 44% in MF higher than those from the respective in situ treatment. There were no significant differences in annual soil CO 2 or N 2 O emissions between the transported and ambient treatments. However, annual CH 4 uptake by the transported soil monoliths in PF or MF was not significantly different from that at the respective in situ treatment, and was significantly lower than that at the respective ambient treatment. Therefore, external environmental factors were the major drivers of soil CO 2 and N 2 O emissions, while soil was the dominant controller of soil CH 4 uptake. We further tested the results by developing simple empirical models using the observed fluxes of CO 2 and N 2 O from the in situ treatment and found that the empirical models can explain about 90% for CO 2 and 40% for N 2 O of the observed variations at the transported treatment. Results from this study suggest that the different responses of soil CO 2 , N 2 O , CH 4 fluxes to changes in multiple environmental conditions need to be considered in global change study.