Sediment nitrogen mineralization characteristics and its influencing factors in coastal wetlands of Daya Bay
ZHAO Chun-yu1,2, JIANG Zhi-jian2, WU Yun-chao2, LIU Song-lin2, HUANG Xiao-ping2, LIU Fu-gang1
1. School of Ecology, Resources and Environment, Dezhou University, Dezhou 253023, China; 2. Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Abstract:To explore the spatial and temporal distribution of the organic nitrogen mineralization process in sediment and the corresponding influencing factors, the sediment organic nitrogen mineralization rates were determined with continuous waterlogging culture of coastal wetland in Daya bay which has been collected during March (dry season) and August (wet season) in 2017. The results showed that the mineralization rates of these stations varied significantly, ranging from 1.88 to 15.12mg/(kg·d), with an average rate of (6.45±3.47)mg/(kg·d), and showed a tendency of the distribution of S3 (mangrove section) > S1 (light beach section) > S2 (estuarine section). The highest mineralization rate in the section of S3, indicated that the growth of mangrove plants could promote the mineralization of microorganisms. The mean values of the activity of protease and urease were (8.52±4.21)mg/(g·d) and (25.34±11.11)g/(g·d), respectively. The spatial distribution of protease activial was consistent with the tendency of the mineralization rate. The highest activity of protease and urease in the high tidal of S3 were mainly because of the boosting production of metabolism enzymes induced by the high productivity and abundance of microorganisms in mangrove forest zone. The higher activity of protease than that of urease suggested that the input of human activities to the coastal wetland mainly by macromolecular organic nitrogen. The lower mineralization rate and enzyme activity in estuarine section was related to the higher NH4+-N content in this area. Generally, significant positive correlation between the mineralization rate and protease and urease (P<0.01) were detected, inferring that protease and urease played a key role in the mineralization of organic nitrogen.
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