| Autor: |
Li X; State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China.; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China., Qi M; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China., Li Q; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China., Wu B; State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China., Fu Y; State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China., Liang X; State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China., Yin G; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China., Zheng Y; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China., Dong H; State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China., Liu M; Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China., Hou L; State Key Laboratory of Estuarine and Coastal Research, Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai, East China Normal University, Shanghai 200241, China. |
| Abstrakt: |
Global warming and acidification, induced by a substantial increase in anthropogenic CO 2 emissions, are expected to have profound impacts on biogeochemical cycles. However, underlying mechanisms of nitrous oxide (N 2 O) production in estuarine and coastal sediments remain rarely constrained under warming and acidification. Here, the responses of sediment N 2 O production pathways to warming and acidification were examined using a series of anoxic incubation experiments. Denitrification and N 2 O production were largely stimulated by the warming, while N 2 O production decreased under the acidification as well as the denitrification rate and electron transfer efficiency. Compared to warming alone, the combination of warming and acidification decreased N 2 O production by 26 ± 4%, which was mainly attributed to the decline of the N 2 O yield by fungal denitrification. Fungal denitrification was mainly responsible for N 2 O production under the warming condition, while bacterial denitrification predominated N 2 O production under the acidification condition. The reduced site preference of N 2 O under acidification reflects that the dominant pathways of N 2 O production were likely shifted from fungal to bacterial denitrification. In addition, acidification decreased the diversity and abundance of nirS -type denitrifiers, which were the keystone taxa mediating the low N 2 O production. Collectively, acidification can decrease sediment N 2 O yield through shifting the responsible production pathways, partly counteracting the warming-induced increase in N 2 O emissions, further reducing the positive climate warming feedback loop. |
