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Shifts of ammonia-oxidation process along salinity gradient in an estuarine wetland

文献类型： 外文期刊

作者： Hu, Weifang 1 ; Chen, Mianrun 2 ; Lan, Xue 5 ; Li, Guoliang 1 ; Wang, Bin 6 ; Sun, Dong Yao 7 ; Lin, Xianbiao 2 ;

作者机构： 1.Guangdong Acad Agr Sci, Key Lab Plant Nutr & Fertilizer South Reg, Guangdong Key Lab Nutrient Cycling & Farmland Cons, Inst Agr Resources & Environm,Minist Agr & Rural A, Guangzhou 510640, Guangdong, Peoples R China

2.Minist Nat Resources, Key Lab Marine Environm Survey Technol & Applicat, Guangzhou 510300, Peoples R China

3.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Minist Educ, Qingdao 266100, Peoples R China

4.Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China

5.South China Agr Univ, Coll Marine Sci, Guangzhou 510642, Peoples R China

6.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200241, Peoples R China

7.Suzhou Univ Sci & Technol, Sch Geog Sci & Geomat Engn, Suzhou 215009, Peoples R China

关键词： Ammonia oxidation; Ammonia-oxidizing archaea; Ammonia-oxidizing bacteria; Salinity; Estuary

期刊名称：ECOLOGICAL INDICATORS （ 影响因子：6.263； 五年影响因子：6.643 ）

ISSN： 1470-160X

年卷期： 2022 年 145 卷

页码：

收录情况： SCI

摘要： Ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) play an important role in nitrogen (N) cycling of the estuarine sediments. However, the shifts of potential ammonia oxidation rates (PARs) of AOA and AOB along different salinity gradients are not well understood. Here, salinity-treated (0, 5, 15, 25 and 35 %o) incubation experiments of sediment from the Pearl River Estuary were performed to explore the influence of salinity on ammonia oxidation process, including the PARs and gene abundances of AOA and AOB. Significant shifts of PARs and amoA gene abundances of ammonia oxidation process along salinity gradient were observed during the incubation (0-60 d). After a long-term incubation, both PARtotal (4.61 +/- 0.93 mu g N g-1 d-1) and PARaob (3.05 +/- 1.04 mu g N g-1 d-1) reached their maximum values at 25 %o salinity, and PARaoa (1.96 +/- 0.10 mu g N g-1 d-1) reached its maximum values at 35 %o salinity, which showed that PARs had higher values under high salinity conditions. AOB amoA gene was more abundant than AOA under moderate and high salinity, and only a significant linear correlation was observed between PARaob and AOB abundances. In addition, the ammonia oxidation activities showed a wide range of salinity tolerance, which is worthy of further study on community structure and transcript richness. Our study illustrates that salinity plays a key role in regulating the ammonia oxidation process in estuarine sediments, and has guiding significance for N fixation and N loss associated with saltwater incursion.

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