Seasonal response of nitrogen exchange fluxes to crab disturbance at sediment-water interface in coastal tidal wetlands

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外文摘要：Coastal wetlands are hotspots for nitrogen(N)cycling,and crab burrowing is known to transform N in intertidal marsh soils.However,the underlying mechanisms remain unclear.This study conducted field experiments and used indoor control test devices to investigate the seasonal response of nitrogen to crab disturbance at the sediment-water interface in coastal tidal flat wetlands.The results showed that crab disturbance exhibited significant seasonality with large seasonal differences in cave density and depth.Due to crab disturbance,nitrogen fluxes at the sediment-water interface were much greater in the box with crabs than in the box without crabs.In summer,NH4+-N showed a positive flux from the sediment to the overlying water,but NO2--N and NO3--N showed positive fluxes from the sediment to the overlying water only in early stages.In winter,NH4+-N showed a positive flux from the sediment to the overlying water,but NO2--N and N03--N both exhibited positive and negative fluxes.These results indicated that the presence of crab burrows can cause the aerobic layer to move downward by approximately 8-15 cm in summer and directly promote nitrification at the sediment surface.

外文关键词：

Coastal tidal flat wetlandCrab disturbanceNitrogen fluxNitrificationDenitrificationSediment-water interface

作者：

Guo-fen Hua、Shang-qing Liu、Xiang-dong Liu、Jin-li Li、Yue Fang、Wen-ting Xie、Xiang Xu

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作者单位：

College of Water Conservancy and Hydroelectric Power,Hohai University,Nanjing 210098,China

College of Renewable Energy,Hohai University,Nanjing 210098,China

基金：

National Natural Science Foundation of ChinaOpen Foundation of the Key Laboratory of Ministry of Education for Coastal Disaster and Protection

项目编号：

52271273Z202201

出版年：

2024

DOI：

10.1016/j.wse.2023.11.007

水科学与水工程

河海大学

水科学与水工程

CSTPCDEI

影响因子：0.432

ISSN：1674-2370

年,卷(期)：2024.17(2)