Seasonal distribution of the isotopic composition of suspended particulate nitrogen in the Changjiang River estuary and its biogeochemistry implications

Yu Haiyan; Yu Zhiming; Song Xiuxian; Liu Lili; Cao Xihua; Yuan Yongquan

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Yu Haiyan, Yu Zhiming, Song Xiuxian, Liu Lili, Cao Xihua, Yuan Yongquan. Seasonal distribution of the isotopic composition of suspended particulate nitrogen in the Changjiang River estuary and its biogeochemistry implications[J]. Haiyang Xuebao, 2014, 36(2): 16-22.

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Seasonal distribution of the isotopic composition of suspended particulate nitrogen in the Changjiang River estuary and its biogeochemistry implications

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences,Beijing 100039, China
2.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2012-12-16
Rev Recd Date: 2013-03-12

Abstract

Abstract

The isotopic composition of suspended particulate matters (δ¹⁵Np) in surface water was studied during February, May, August and November of 2010 in the Changjiang River estuary. Based on the variations of δ¹⁵Np in different seasons and regions, the biogeochemical processing of nitrogen transformation was studied and its environmental implications were also revealed. The results showed that δ¹⁵Np of SPM was in a wide range of -1.1‰-8.6‰, varying with seasons and geographic regions, which reflected influences of riverine input and biogeochemical processes. In February, the variation of δ¹⁵Np reflected the mixing between riverine and marine nitrogen; in May and November, δ¹⁵Np decreased with increased Chl a in the surface waters, which indicated assimilation; in August and November, significant positive relationships were found between δ¹⁵Np and DIN, which indicated remineralizaion and nitrification.
- nitrogen isotope,
- assimilation,
- mineralization,
- nitrification

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References(32)

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