浒苔生长-衰亡过程中氮形态的迁移转化过程

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Abstract

To investigate the mechanism of nitrogen uptake and metabolism in U. prolifera, the distribution and migration of different forms of nitrogen in culture media and algea cells during the growth-decay process was studied with continuous culture experiments. U. prolifera absorbed NO₃^--N (17.37μmol/(g·d)) into the cell during the growth phase while released NH₄⁺-N (0.84μmol/(g·d)) to the extracellular during the decay phase. In algae cell, up to 73.75%~92.15% of dissolved inorganic nitrogen (DIN) was NO₃^--N during the growth phase, while 60.87%~92.13% was NH₄⁺-N during the decay period. The concentration of dissolved organic nitrogen (DON) in the culture media increased continually during the culture period, with < 1kDa component accounting for 64%~98% and > 1kDa component accounting for 2%~36%. The average migration rate of DIN was about 8.96μmol/(g·d), and the average release rate of DON was about 59.57μmol/(g·d). Nearly 60% DIN was converted into DON and secreted extracellularly, most of which was < 1kDa component. It can be speculated that the outburst of U. prolifera impacts the structure of biological elements significantly on the monthly scale.

Key words： Ulva prolifera nitrogen forms tangential flow ultrafiltration

Received: 08 October 2018

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X142

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	Articles by authors
	ZHAGN Peng-yan
	YAN Zhen-wei
	ZHONG Xiao-song
	JIN Yue-mei
	YAN Mao-jun
	YU Ji-kai
	XIN Yu
	LIU Tao

Cite this article:

ZHAGN Peng-yan,YAN Zhen-wei,ZHONG Xiao-song等. Transformation and migration of nitrogen forms during the growth-decay of Ulva Prolifera[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1967-1976.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I5/1967

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