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Soil organic nitrogen content and composition in different wetland habitat types along the south-east coast of China

Xiao Lin, Yanli Yang, Ping Yang Orcid Logo, Yan Hong, Linhai Zhang, Chuan Tong, Derrick Y.F. Lai Orcid Logo, Yongxin Lin, Lishan Tan Orcid Logo, Yalan Tian, Kam Tang Orcid Logo

CATENA, Volume: 232, Start page: 107457

Swansea University Author: Kam Tang Orcid Logo

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DOI (Published version): 10.1016/j.catena.2023.107457

Abstract

Soil organic nitrogen (SON) turnover regulates soil nitrogen (N) storage and availability. The coastal mudflats (MFs) in China have undergone drastic transformation due to invasive Spartina alterniflora (SAs) and subsequent reclamation of Spartina marshes to create aquaculture ponds (APs), but the i...

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Published in: CATENA
ISSN: 0341-8162 1872-6887
Published: Elsevier BV 2023
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URI: https://cronfa.swan.ac.uk/Record/cronfa64060
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Abstract: Soil organic nitrogen (SON) turnover regulates soil nitrogen (N) storage and availability. The coastal mudflats (MFs) in China have undergone drastic transformation due to invasive Spartina alterniflora (SAs) and subsequent reclamation of Spartina marshes to create aquaculture ponds (APs), but the impact on the amounts and compositions of soil nitrogen remains unclear. This study measured the topsoil total nitrogen (STN) and organic nitrogen (SON) compositions in 21 coastal wetlands in southeastern China. Results show that conversion of MFs to SAs increased STN by 38.5%, whereas subsequent conversion to APs decreased it by 16.4%, and the effect was consistent across the broad geographic and climate gradients. Most of the change occurred in the non-acid-hydrolysable fraction of SON, which accounted for 32–42% of STN. Within the acid-hydrolysable fraction, amino acid N, ammonia N and amino sugar N together accounted for about 57%, with the remaining 43% unidentified chemically. Our results suggest that invasion by S. alterniflora was the overwhelming driver to increase bioavailability of nitrogen and related biogeochemical processes in coastal soil, and the effects were partly reversed in subsequent reclamation of Spartina marshes to create aquaculture ponds.
Keywords: Coastal wetland, Invasive species, Spartina alterniflora, Land use change, Acid hydrolysis
College: Faculty of Science and Engineering
Funders: This research was supported by the National Natural Science Foundation of China (NSFC) (Grant No. 41801070, and No. 41671088), the National Natural Science Foundation of Fujian Province (Grant No. 2020J01136), the Minjiang Scholar Programme, the Research Grants Council of Hong Kong (CUHK 14122521, 14302420) and CUHK Direct Grant (145489489)
Start Page: 107457

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