Vegetation alters the effects of salinity on greenhouse gas emissions and carbon sequestration in a newly created wetland

文献类型： 外文期刊

第一作者： Sheng, Qiang

作者： Sheng, Qiang;Wu, Jihua;Sheng, Qiang;Wang, Lei

作者机构：

关键词： Wetland restoration;Wetland management;Greenhouse gases;Carbon sequestration;Salinity

期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）

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收录情况： SCI

摘要： Wetland creation or restoration in degraded areas has become a new type of disturbance worldwide. Coastal wetlands serve a vital role in global carbon cycles; thus, it is important to understand the impacts of wetland creation on carbon storage functions. Carbon emissions and accumulation in wetlands are reported to be highly site-specific depending on factors such as salinity, plant type and productivity, and water table. This study investigated the effects of different salinities (<2 parts per thousand, similar to 5%. and >10 parts per thousand) on greenhouse gas emissions and carbon sequestration of created wetlands in the Yangtze River estuary. CH4 emissions significantly declined with increasing salinity, likely because of the higher sediment sulfate content at higher salinities. CO2 emissions were highest at intermediate salinities (similar to 5 parts per thousand). In unvegetated sites, the absolute CO2 emission equivalent was 0.178 kg m(-2) y(-1) in the <2 parts per thousand salinity treatment, which was 8.09 times higher than the >10 parts per thousand salinity treatment. In vegetated sites, the <2 parts per thousand salinity treatment had the highest annual net flux of carbon. Thus, despite the high carbon emission of low salinity wetland, enhanced plant productivity resulted in a high carbon absorption rate. Overall, these results demonstrate that the presence of vegetation altered the effects of salinity on carbon equivalency in created wetlands. This study suggests that to conserve the wetland carbon sink function, landscape design for wetland restoration in estuarine regions should consider creating open water wetland in high salinity regions and restoring vegetation in low salinity regions to facilitate the growth of macrophytes such as Phragmites australis. (C) 2015 Elsevier B.V. All rights reserved.

分类号： Q14`X171

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