大亚湾湿地沉积物氮矿化特征及影响因素探究

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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.

Key words： sediment mineralization of organic nitrogen enzyme activity influencing factors coastal wetlands

Received: 18 March 2021

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X142

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	Articles by authors
	ZHAO Chun-yu
	JIANG Zhi-jian
	WU Yun-chao
	LIU Song-lin
	HUANG Xiao-ping
	LIU Fu-gang

Cite this article:

ZHAO Chun-yu,JIANG Zhi-jian,WU Yun-chao等. Sediment nitrogen mineralization characteristics and its influencing factors in coastal wetlands of Daya Bay[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4843-4849.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4843

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