Microtopography and hydrological regulation alter CO2 and CH4 fluxes in urban wetlands: Evidence from the Pearl River Delta, China
文献类型：期刊论文
| 作者 | Ouyang, Kangting2,3,4; Wang, Zhihui3; Sun, Zhongyu3; Huang, Guangqing2,3,4; Yang, Long3; Liu, Meijie3; Fan, Cunxiang1; Lin, Zhibin1 |
| 刊名 | CATENA
 |
| 出版日期 | 2024-11-01 |
| 卷号 | 246页码:11 |
| 关键词 | Urban wetlands Microtopography Hydrology Iron oxides Enzyme activity CO2 and CH4 flux |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2024.108455 |
| 英文摘要 | Inland urban wetlands are significant sources of CO2 2 and CH4. 4 . Wetland carbon fluxes can be influenced by management (e.g., restoration), impacting atmospheric carbon emissions. However, the regulatory mechanisms underlying the variations in CO2 2 and CH4 4 fluxes affected by microtopography and hydrological regulation, such as the water table, remain unclear, and field monitoring is inadequate. This study measured CO2 2 and CH4 4 fluxes and soil physicochemical properties across various micro-terrains in the restored Guangdong Guangzhou Haizhu Wetland in China and analyzed the direct and indirect effects of these factors on carbon flux. The results showed that the CO2 2 flux was lower than most previously reported urban wetland fluxes, with means of 3.41, 2.08, and 1.04 mmol center dot m-- 2 center dot d- 1 for hummocks, transition zones, and hollows, respectively. Similarly, the CH4 4 flux was lower than most previously reported fluxes in natural wetlands, with averages of 0.00027, 0.435, and 0.0087 mmol center dot m-2 center dot d-1- 2 center dot d- 1 for hummocks, transition zones, and hollows, respectively. Microtopography significantly reduced the CO2 2 flux, while saturated regions such as transition zones and hollows released CH4. 4 . Water level fluctuations primarily caused the elevated CO2 2 and CH4 4 emissions from transition zones compared to hollows. Redundancy analysis indicated that hydrolytic enzyme activity (73.85 %) and temperature (70.96 %) explained most of the variation in carbon flux. Path analysis revealed that microtopography influenced soil temperature, iron oxide contents, and enzyme activity via regulating the water level to affect CO2 2 and CH4 4 fluxes indirectly, with total variances of 69 % and 66 %, respectively. Overall, microtopography alters the patterns of CO2/CH4 2 /CH 4 flux, and appropriate hydrological regulation can reduce carbon emissions. Based on the complex changes in urban hydrology, this study emphasizes that wetland restoration strategies must consider topographic structures and hydrological management to mitigate carbon emissions. |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001338940100001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81255]  |
| 专题 | 中国科学院广州地球化学研究所 |
| 通讯作者 | Yang, Long |
| 作者单位 | 1.Publ Educ & Res Ctr Haizhu Wetland Guangzhou, Guangzhou 510235, Peoples R China 2.Univ Chinese Acad Sci, Beijing 101408, Peoples R China 3.Guangdong Acad Sci, Guangzhou Inst Geog, Guangzhou 510070, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ouyang, Kangting,Wang, Zhihui,Sun, Zhongyu,et al. Microtopography and hydrological regulation alter CO2 and CH4 fluxes in urban wetlands: Evidence from the Pearl River Delta, China[J]. CATENA,2024,246:11. |
| APA | Ouyang, Kangting.,Wang, Zhihui.,Sun, Zhongyu.,Huang, Guangqing.,Yang, Long.,...&Lin, Zhibin.(2024).Microtopography and hydrological regulation alter CO2 and CH4 fluxes in urban wetlands: Evidence from the Pearl River Delta, China.CATENA,246,11. |
| MLA | Ouyang, Kangting,et al."Microtopography and hydrological regulation alter CO2 and CH4 fluxes in urban wetlands: Evidence from the Pearl River Delta, China".CATENA 246(2024):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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