冬季太湖草、藻型湖区N<sub>2</sub>O的生成与排放特征

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Abstract

N₂O fluxes of water-gas interface and sediment-water interface and the dissolved N₂O concentration in water column were studied in grass type zones including submerged plants and emergent plants and algae type zones in Lake Taihu. In situ observation of the physicochemical properties of water and sediments and the laboratory analysis the main factors were also carried out to determine the main factors affecting the production and release of N₂O. The results showed that:both N₂O fluxes of the water-gas interface and sediment-water interface of algae type zones were highest followed by emergent plants and submerged plants type zones (123.10±11.43)μg/(m²·h), (79.19±4.90)μg/(m²·h), (53.45±4.22)μg/(m²·h) and (29.60±0.20)μmol/(m²·h), (10.89±1.66)μmol/(m²·h), (3.83±0.30)μmol/(m²·h)). The dissolved N₂O concentration in water column of the algae type zones was the highest, but with the emergent plants type zones being the lowest ((0.0247±0.0003)μmol/L,(0.0236±0.0003)μmol/L,(0.0219±0.0001)μmol/L). The experimental results of indoor micro-environment simulation showed that the production of N₂O was correlated with the temperaturewhile the high salinity had inhibitory effect in general on the formation of N₂O in all three sites. The sediments of algae and emergent plant type zone with added salinity had a higher potential than the control group, and the inhibition persisted since the Cl^- was added in submerged plant type zone. With the increase of nutrients concentrations such asNH+ 4-N and NO-3-N,the rate of N₂O formation in algae and submerged type zones increased, but emergent type zones decreased.The organic carbon sourceproviding the carbon source and energy for microbial activity inhibited the formation of N₂O. There were different characteristics of N₂O production and release in algae and grass type zones in Lake Taihu,the formation of N₂O in grass and algae type region of Taihu Lake was mainly limited by low temperature of winter, and was also affected by inorganic nitrogen forms and concentration of water column.

Key words： algae and grass type zones sediment N₂O nutrients addition Lake Taihu

Received: 24 July 2017

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	Articles by authors
	ZHENG Xiao-lan
	LIU Min
	WEN Shuai-long
	LIU De-hong
	ZHONG Ji-cheng

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ZHENG Xiao-lan,LIU Min,WEN Shuai-long等. Characteristics of N₂O formation and emission in algae and grasstype zones in Lake Taihu in winter[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 683-693.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I2/683

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