香溪河流域水体环境因子研究

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Abstract

Based on routine monitoring data in Xiangxi river and its tributaries of Gufu river, Gaolan river and Jiuchong river from August 1999 to December 2006, physico-chemical factors were analyzed, and spatio-temporal distributions of such factors were compared in this paper. The results show that waters of Xiangxi watershed are neutral and partial alkalescent, belong to moderate hardness, concentration of dissolved oxygen is high, contents of chemical oxygen demand and chloride are low, so these waters have well buffer capacities. There are significant seasonal variations in most physico-chemical factors in these four rivers, but annual variations are not significant. There are high contents of nitrogen in this watershed, and Gufu river has the highest contents of total nitrogen which influenced by the domestic sewages and agricultural activities. Water quality is relative poor in Gaolan river, and phosphorus pollution is serious in Xiangxi river; the best water quality presents to Jiuchong river which has high forest coverage. High nitrogen contents in these four rivers are caused by non-point source pollutants, while point source pollutants of phosphorus play an important role in Xiangxi river. Soil erosion represents the major non-point source, while the drainages of phosphorus diggings and factory discharges play the most important role in the point source of phosphorus. This research suggests that measures must be taken to control the point source pollutants of phosphorus in Xiangxi river in order to protect Xiangxi Bay of the Three-Gorge Reservoir.

Key words： Xiangxi river watershed physico-chemical factors water quality

Received: 25 June 2007

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	Articles by authors
	LI Feng-qing
	YE Lin
	LIU Rui-qiu
	CAO Ming
	CAI Qing-hua

Cite this article:

LI Feng-qing,YE Lin,LIU Rui-qiu, et al. Investigation on aquatic environmental factors in Xiangxi river watershed[J]. , 2007, 26(3): 199-207.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2007/V26/I3/199

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