In:
Soil Science Society of America Journal, Wiley, Vol. 83, No. 5 ( 2019-09), p. 1368-1377
Abstract:
Core Ideas We investigated estuarine environmental factors on CH 4 flux from two vegetation communities. Warming significantly affected on CH 4 emission from the Phragmites australis community. There was a significant correlation between CH 4 flux and water level in both communities. Salinity significantly affects CH 4 emissions from the Phragmites australis community. The interaction between temperature and water level was the most important factor controlling CH 4 flux. Global warming, rising sea levels, and saltwater intrusion interact to affect carbon cycling, specifically methane (CH 4 ) flux in estuarine coastal wetlands. In the present study, Phragmites australis and Spartina alterniflora communities in the intertidal zone of the Yangtze estuary were selected for investigating CH 4 flux under different temperature (natural/warming), water level (high/low), and salinity (0, 5, 15, and 30‰) conditions. The average CH 4 flux (from April to October 2016) under natural conditions was 141.0 ± 21.5 and 502.8 ± 65.3 μmol m −2 h −1 for P. australis and S. alterniflora communities, respectively. Warming had a particularly pronounced effect on CH 4 emissions from the P. australis community and increased CH 4 flux by 130%. There was a significant correlation between CH 4 flux and water level; at high water levels, CH 4 flux was 2.64‐ and 3.78‐fold higher in P. australis and S. alterniflora communities, respectively. Salinity had a significant pronounced effect on CH 4 emissions from the P. australis community, and there was a clear order (5‰ 〉 15‰ 〉 0‰ 〉 30‰) in CH 4 flux. The interaction between temperature and water level was the most important factor controlling CH 4 flux from wetlands; CH 4 emissions were greater at higher temperature and higher water levels. However, at low water level, the effect of salinity was more prominent. The results suggest that CH 4 flux from estuarine wetlands could be further enhanced in the future under the influence of rising sea levels due to global warming.
Type of Medium:
Online Resource
ISSN:
0361-5995
,
1435-0661
DOI:
10.2136/sssaj2018.12.0472
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
241415-6
detail.hit.zdb_id:
2239747-4
detail.hit.zdb_id:
196788-5
detail.hit.zdb_id:
1481691-X
SSG:
13
SSG:
21
