Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands
Mangrove ecosystems are highly productive, sequestering large amounts of carbon from the atmosphere while emitting relatively low levels of greenhouse gases. Large amounts of organic matter and nitrogen from river discharge may stimulate production and emission of greenhouse gases including N _2 O,...
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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/adbdde |
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| author | Conghe Zhang Wei Ke Caitlin Hicks Pries Fernando Montaño López Joanna Ridgeway Liming Wang Yimeng Yin Shengbin Ye Shanshan Song Xinyu Dou Xinao Guo Miao Li Siya Shao Shuguo Lv Guanghui Lin |
| author_facet | Conghe Zhang Wei Ke Caitlin Hicks Pries Fernando Montaño López Joanna Ridgeway Liming Wang Yimeng Yin Shengbin Ye Shanshan Song Xinyu Dou Xinao Guo Miao Li Siya Shao Shuguo Lv Guanghui Lin |
| author_sort | Conghe Zhang |
| collection | DOAJ |
| description | Mangrove ecosystems are highly productive, sequestering large amounts of carbon from the atmosphere while emitting relatively low levels of greenhouse gases. Large amounts of organic matter and nitrogen from river discharge may stimulate production and emission of greenhouse gases including N _2 O, thus reducing the blue carbon storage capacity of mangrove wetlands. However, it is unclear how the input of organic matter and nitrogen affect the emission fluxes of these greenhouse gases in mangrove wetlands. In this study, we compared the effluxes of N _2 O between the estuarine and non-estuarine mangrove wetlands near the seven major rivers on Hainan Island of China. The averaged N _2 O emission flux in the estuarine mangrove wetlands was 6.9 times than the non-estuarine mangrove wetlands. In the non-estuarine mangrove wetlands N _2 O emission flux increased significantly with total nitrogen content in the sediments. In contrast, organic carbon (OC)/organic nitrogen (ON) ratios were associated with N _2 O emissions in the estuarine mangrove wetlands. As rivers bring in more organic matter with high ON content, more N _2 O emissions occur in estuarine areas. OC in sediments are from different sources between estuary (fresh water dissolved OC (DOC)) and non-estuary (marine DOC) area. A higher OC/ON ratio leads to higher nitrification and lower N _2 O consumption enzyme activities in estuary areas compared with non-estuaries, which contributes extra N _2 O fluxes. Our study provides a direct process assessment of the response of natural N _2 O emissions to sediment chemistry changes caused by river inputs. |
| format | Article |
| id | doaj-art-c3eb2d5a876740d58fddac3dea2db385 |
| institution | Kabale University |
| issn | 1748-9326 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | Environmental Research Letters |
| spelling | doaj-art-c3eb2d5a876740d58fddac3dea2db3852025-08-20T03:41:57ZengIOP PublishingEnvironmental Research Letters1748-93262025-01-0120404402210.1088/1748-9326/adbddeHigher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlandsConghe Zhang0https://orcid.org/0009-0006-2668-7527Wei Ke1https://orcid.org/0009-0009-6693-6323Caitlin Hicks Pries2Fernando Montaño López3https://orcid.org/0009-0006-8607-7720Joanna Ridgeway4Liming Wang5Yimeng Yin6Shengbin Ye7Shanshan Song8https://orcid.org/0000-0003-3313-3232Xinyu Dou9Xinao Guo10Miao Li11Siya Shao12Shuguo Lv13Guanghui Lin14https://orcid.org/0000-0001-6108-3215Department of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaDepartment of Biological Science, Dartmouth College , Hanover, NH 03755, United States of AmericaDepartment of Biological Science, Dartmouth College , Hanover, NH 03755, United States of AmericaDepartment of Biological Science, Dartmouth College , Hanover, NH 03755, United States of AmericaSchool of Environment and Natural Resources , Renmin University, Beijing 100872, People’s Republic of ChinaSchool of Environment and Natural Resources , Renmin University, Beijing 100872, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of ChinaClimate & Ecosystem Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, CA 94720, United States of AmericaHainan International Blue Carbon Research Center , Haikou, Hainan 570100, People’s Republic of China; Hainan Research Academy of Environmental Science , Haikou, Hainan 570100, People’s Republic of ChinaDepartment of Earth System Science, Ministry of Education Key Laboratory for Earth System Modeling , and Institute for Global Change Studies, Tsinghua University, Beijing 100084, People’s Republic of China; Hainan International Blue Carbon Research Center , Haikou, Hainan 570100, People’s Republic of China; Institute of Ocean Engineering , Tsinghua Shenzhen International Graduate School, Shenzhen, Guangdong 518055, People’s Republic of ChinaMangrove ecosystems are highly productive, sequestering large amounts of carbon from the atmosphere while emitting relatively low levels of greenhouse gases. Large amounts of organic matter and nitrogen from river discharge may stimulate production and emission of greenhouse gases including N _2 O, thus reducing the blue carbon storage capacity of mangrove wetlands. However, it is unclear how the input of organic matter and nitrogen affect the emission fluxes of these greenhouse gases in mangrove wetlands. In this study, we compared the effluxes of N _2 O between the estuarine and non-estuarine mangrove wetlands near the seven major rivers on Hainan Island of China. The averaged N _2 O emission flux in the estuarine mangrove wetlands was 6.9 times than the non-estuarine mangrove wetlands. In the non-estuarine mangrove wetlands N _2 O emission flux increased significantly with total nitrogen content in the sediments. In contrast, organic carbon (OC)/organic nitrogen (ON) ratios were associated with N _2 O emissions in the estuarine mangrove wetlands. As rivers bring in more organic matter with high ON content, more N _2 O emissions occur in estuarine areas. OC in sediments are from different sources between estuary (fresh water dissolved OC (DOC)) and non-estuary (marine DOC) area. A higher OC/ON ratio leads to higher nitrification and lower N _2 O consumption enzyme activities in estuary areas compared with non-estuaries, which contributes extra N _2 O fluxes. Our study provides a direct process assessment of the response of natural N _2 O emissions to sediment chemistry changes caused by river inputs.https://doi.org/10.1088/1748-9326/adbddemangrove forestcoastal wetlandriver dischargeN2O emissionblue carbon |
| spellingShingle | Conghe Zhang Wei Ke Caitlin Hicks Pries Fernando Montaño López Joanna Ridgeway Liming Wang Yimeng Yin Shengbin Ye Shanshan Song Xinyu Dou Xinao Guo Miao Li Siya Shao Shuguo Lv Guanghui Lin Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands Environmental Research Letters mangrove forest coastal wetland river discharge N2O emission blue carbon |
| title | Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands |
| title_full | Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands |
| title_fullStr | Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands |
| title_full_unstemmed | Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands |
| title_short | Higher nitrification and lower consumption drive higher N2O effluxes in estuarine than non-estuarine mangrove wetlands |
| title_sort | higher nitrification and lower consumption drive higher n2o effluxes in estuarine than non estuarine mangrove wetlands |
| topic | mangrove forest coastal wetland river discharge N2O emission blue carbon |
| url | https://doi.org/10.1088/1748-9326/adbdde |
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