NITROGEN FIXATION OF WATER COLUMN IN NORTH TAIHU LAKE AND ITS INFLUENCING FACTORS FACTORS

ZHANG Bo; ZHAO Zhong-hua; SHEN Qiu-shi; ZHANG Lu

doi:10.13205/j.hjgc.202006019

Volume 38 Issue 6

Aug. 2020

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ZHANG Bo, ZHAO Zhong-hua, SHEN Qiu-shi, ZHANG Lu. NITROGEN FIXATION OF WATER COLUMN IN NORTH TAIHU LAKE AND ITS INFLUENCING FACTORS FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 121-125. doi: 10.13205/j.hjgc.202006019

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ZHANG Bo, ZHAO Zhong-hua, SHEN Qiu-shi, ZHANG Lu. NITROGEN FIXATION OF WATER COLUMN IN NORTH TAIHU LAKE AND ITS INFLUENCING FACTORS FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(6): 121-125. doi: 10.13205/j.hjgc.202006019

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NITROGEN FIXATION OF WATER COLUMN IN NORTH TAIHU LAKE AND ITS INFLUENCING FACTORS FACTORS

doi: 10.13205/j.hjgc.202006019

1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2. Shenzhen Techand Ecology & Environment Co., Ltd, Shenzhen 518040, China

Received Date: 2019-05-22

Abstract

Abstract

In order to study the nitrogen fixation of the water in North Taihu Lake and the influencing factors, with the acetylene reduction technique(ART),the nitrogen fixation rate in situ of the water column and the roles of nitrogen (N), iron (Fe) and molybdenum(Mo)in controlling nitrogen fixation rate of Anabaena spp indoor were studied. The results showed that the annual mean nitrogen fixation rate of North Taihu Lake was 3.08 ng/(L·h), with a obvious spatio-temporal variation. The highest rate appeared in Meiliang Bay (2.75 ng/(L·h)) and the lowest rate appeared in the Center of lake (1.38 ng/(L·h)) in space. The rate in summer (6.03 ng/(L·h)) was the highest, and then spring (1.08 ng/(L·h)) and autumn (0.81 ng/(L·h)),lowest in winter (6.97×10^-5 ng/(L·h)). With the correlation analysis,the growth of Anabeana spp was not effected by nitrogen, iron and molybdenum (P>0.05). The nitrogen fixation rates were effected by nitrogen (P<0.01), other than iron and molybdenum (P>0.05). Temperature,DTN,the biomass of algae (P<0.01) and NO₃^- (P<0.05) of water in situ were the main influencing factors of the spatio-temporal variation in the in situ nitrogen fixation rates.
- nitrogen fixation,
- water column,
- Anabaena sp,
- North Taihu Lake

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