千岛湖水体氮的垂向分布特征及来源解析

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Abstract Water samples were collected at the depths of 0.2, 5, 10, 20, 30 and 40m in Qiandao Lake. Concentrations of nitrogenous species and dual isotopes of nitrate (δ¹⁵N-NO₃^- and δ¹⁸O-NO₃^-) were analyzed to identify the vertical distribution of nitrogen and the main nitrate sources. The results showed that nitrate (NO₃^-) and dissolved organic nitrogen (DON) were the major nitrogenous species, accounting for 57.9% and 39.7% of total dissolved nitrogen, respectively. The values of δ¹⁵N-NO₃^- ranged from 3.8‰ to 5.8‰ with a mean of 4.5‰, and the values of δ¹⁸O-NO₃^- varied from 2.1‰ to 5.9‰, with a mean of 4.3‰ in Qiandao Lake. In the upper water (0~10m), nitrification and assimilation of phytoplankton were the main biogeochemical processes. In the middle water (10~30m), nitrification was the dominant biogeochemical process with the increasing concentrations of nitrate and the decrease of δ¹⁸O-NO₃^- values. The bottom water (30~40m) was affected by nitrification, nitrogen release from sediment and denitrification. The contributions of external sources (precipitation, sewage/manure, nitrogen fertilizer and soil nitrogen) and endogenous nitrogen source (sediment) were calculated by SIAR. It was showed that nitrogen fertilizer was the most important nitrate source in Qiandao Lake, accounting for 51.9% in S1 and 30.6% in S2. The agricultural non-point source pollution from Xinan River resulted in the higher contribution of nitrogen fertilizer in S1than that in S2. The effect of soil nitrogen was also significant for the NO₃^- in Qiandao Lake, contributing 17.8% in S1and 27.8% in S2. There was more serious soil erosion in S2in central lake which is surrounded by mountains with more cultivated land on hillside. In addition, the results suggested that the endogenous nitrogen source (sediment) can't be neglected in the bottom water of Qiandao Lake.

Key words： nitrate vertical distributions nitrogen isotopes oxygen isotopes SIAR

Received: 28 January 2019

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X524

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	JIN Zan-fang
	CEN Jia-rong
	HU Yu-ming
	LI Lin-jun
	LI Fei-li

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JIN Zan-fang,CEN Jia-rong,HU Yu-ming等. The vertical distribution of nitrogen and the nitrogen sources in Qiandao Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3441-3449.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3441

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