文献类型：期刊文献

英文题名：Soil Nitrogen Transformation Pathways Shift Following Deep Tillage in Coastal Wetlands Invaded by Spartina alterniflora

作者：Gao, Jingwen[1] Jiang, Pengcheng[1,2] Li, Junzhen[1] Wu, Ming[1] Shao, Xuexin[1] Li, Niu[1]

第一作者：Gao, Jingwen

通信作者：Li, N[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, State Key Lab Wetland Conservat & Restorat, Wetland Ecosyst Res Stn Hangzhou Bay, Daqiao Rd 73, Hangzhou 311400, Peoples R China;[2]Zhejiang Agr & Forestry Univ, Coll Forestry & Biotechnol, Hangzhou 311300, Peoples R China

年份：2025

卷号：17

期号：7

外文期刊名：DIVERSITY-BASEL

收录：;Scopus(收录号：2-s2.0-105011621289);WOS:【SCI-EXPANDED(收录号:WOS:001536805500001)】；

基金：This study was supported by the Zhejiang Province Commonwealth Projects (Grant No. LQ23C030003); Special Fund for Basic Scientific Research Operations of Central Public Welfare Research Institutes (Grant No. CAFYBB2024MA029); the Cooperation Program between Zhejiang Province and the Chinese Academy of Forestry (Grant No. 2023SY11); the Zhejiang Provincial Science and Technology Program (Grant No. 2023C03120); the Pioneer and Leading Goose R&D Program of Zhejiang Province (Grant Nos. 2025C02050 and 2025C02230); and the National Key Research and Development Program of China (Grant No. 2023YFE0101700).

语种：英文

外文关键词：coastal wetland restoration; vertical soil stratification; nitrogen cycling; denitrification; DNRA

摘要：Spartina alterniflora invasion has posed severe ecological threats to coastal wetlands. Deep tillage is considered an effective physical method for ecological restoration in such wetlands; however, its effects on sediment nitrogen transformation processes remain unclear. In this study, we investigated the impacts of deep tillage on soil physicochemical properties and key nitrogen transformation pathways, including nitrification, denitrification, anammox, and DNRA, across different soil depths (0-10, 10-20, 20-30, 30-50, and 50-100 cm) in Spartina alterniflora-invaded coastal wetlands. Deep tillage significantly restructured the distribution of soil moisture (p < 0.05), pH (p > 0.05), electrical conductivity (p < 0.05), and nutrients, promoting NO3--N accumulation in deeper layers while reducing NH4+-N concentrations in surface soils (p < 0.05). It markedly enhanced denitrification and DNRA rates (p < 0.05), suppressed surface nitrification (p < 0.05), and altered the vertical distribution of anammox activity. Correlation analysis revealed that NH4+-N and NO3--N concentrations were the primary drivers of nitrogen transformation, with pH and electrical conductivity playing secondary roles. Overall, deep tillage stimulated nitrogen removal processes and affected net ammonium changes. These findings reveal that deep tillage can stimulate nitrogen removal processes by alleviating soil compaction and altering nitrogen transformation pathways, thus supporting biogeochemical recovery mechanisms after deep tillage. These insights provide scientific guidance for the ecological restoration of Spartina alterniflora-invaded coastal wetlands.