Spartina alterniflora invasion enhances sediment nitrification processes in coastal wetland
文献类型： 外文期刊
作者： Lin, Xianbiao 1 ; Sun, Dongyao 1 ; Wang, Zihao 2 ; Gao, Dengzhou 5 ; Hu, Weifang 6 ; Du, Wei 7 ;
作者机构： 1.East China Normal Univ, Key Lab Geog Informat Sci, Minist Educ, Shanghai 200241, Peoples R China
2.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China
3.Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China
4.Suzhou Univ Sci & Technol, Sch Geog Sci & Geomatics Engn, Suzhou, Peoples R China
5.Fujian Normal Univ, Sch Geog Sci, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou 350117, Peoples R China
6.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China
7.Kunming Univ Sci &Technol, Fac Environm Sci & Engn, Yunnan Prov Key Lab Soil Carbon Sequestrat & Pollu, Kunming 650500, Peoples R China
关键词：
Nitrification; Comammox; Ammonia oxidizers;
期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）
ISSN： 0032-079X
年卷期： 2025 年
页码：
收录情况： SCI
摘要： AimsSpartina alterniflora (S. alterniflora) invasion notably impacts sediment nitrogen (N) biogeochemical processes in coastal wetlands. However, its effects on different nitrification processes and their mechanisms in both surface (0-10 cm) and subsurface (10-20 cm) sediments remain unclear.MethodsPotential nitrification rates mediated by ammonia-oxidizing archaea (AOA), bacteria (AOB), and comammox Nitrospira (PARAOA, PARAOB, and comammox rates), their relative contributions, functional genes (AOA, AOB, and Ntsp-aomA), and controlling factors were investigated in both surface and subsurface sediments of native Cyperus malacensis and adjacent S. alterniflora-invaded habitats with varying years (6, 10, and 14 years) in the Minjiang River Estuary, China.ResultsThese three nitrification rates varied both spatially and seasonally. Summer nitrification rates (5.57 +/- 2.28 mu g N g-1 d-1) in both surface (0-10 cm) and subsurface (10-20 cm) sediments of these ecosystems were substantially higher than winter levels (3.78 +/- 1.76 mu g N g-1 d-1). S. alterniflora invasion increased nitrification rates (39.54-68.13%) and associated functional gene abundances (28.08-52.92%) in both seasons, with surface sediments (118.40-153.85%) markedly showing higher values than subsurface layers (32.80-73.17%). Additionally, the relative contribution of PARAOA in nitrification exhibited a marked enhancement with the S. alterniflora invasion. PLS-PM results further indicated that the spatiotemporal fluctuations in sediment nitrification rates were predominantly driven by organic matter accumulation and ambient temperature.ConclusionsThese findings highlight the substantial influence of S. alterniflora invasion on sediment nitrification dynamics, providing fundamental data for estimating N budgets and turnover in the estuarine wetlands.
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