期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 149, 期 11, 页码 1820-1828出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2009.06.010
关键词
Estuarine wetland; Carbon flux; Tidal elevation; Eddy covariance; Spectral analysis; Respiration
资金
- National Basic Research Program of China [2006CB403305]
- National Natural Science Foundation of China [40471087]
- Shanghai Municipal Natural Science Foundation [06ZR14015]
- New Century Excellent Talents in University [NCET-06-0364]
- Ministry of Education of China
One year of continuous data from two eddy-flux towers established along an elevation gradient in coastal Shanghai was analyzed to evaluate the tidal effect on carbon flux (F-c) over an estuarine wetland. The measured wavelet spectra and cospectra of F-c and other environmental factors demonstrated that the dynamics of F-c at both sites exhibited a tidal-driven pattern with obvious characteristics at scales between 10 and 20 days (256-512-h). Environmental factors exerted major controls on the carbon balance at finer temporal scales F-c was more sensitive to tides at the low-elevation site than at the high-elevation site. Overall, the mean nighttime F-c during spring tides was lower than that during neap, tides, indicating suppressed ecosystem respiration under inundation. Larger differences were observed at the low-elevation site due to longer inundation durations. In contrast, daytime F-c was more variable since plants reacted differently in different growth periods and under different tidal elevations. The amplitudes of diurnal F-c during tidal periods were larger than those reported for other wetland types, implying a great potential for future carbon sequestration. Whilst tides would also transport organic matter to nearby estuaries and hence may incur carbon emission in the receiving ecosystems. Thus, further study on lateral carbon transport is required to investigate the tidal effect on the carbon sink/source role of the wetland. (C) 2009 Elsevier B.V. All rights reserved.
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