Abstract
Wetland plays an irreplaceable role in many aspects and waters are important part of wetland, the water quality can easily reflect the situation of Wetland. In this study, water quality was assessed on the basis of 5 parameters (DO, NH 4 + -N, TN, TP and CODcr) that were monitored monthly at 5 sites (N 1 ,N 2 ,N 3 ,N 4 and N 5 )from April, 2014 to March, 2015 of the Nanhai Lake in Baotou, China by water pollution index method and comprehensive water quality identification index method. The twelve monitoring months were divided into wet season (Mar., Aug. and Sep.), normal season (Jan., Feb., Apr., Nov. and Dec.) and dry season (May., Jun. and Jul.). The assessment results determined using the water pollution index method showed that the water quality of all the five monitoring sites were inferior Ⅴ, the main contamination was COD. The comprehensive water quality identification index showed that the water quality of the Nanhai Lake were classesⅤ, except for the N 2 in wet season and dry season, the N 1 in dry season and the N 5 in normal season, which were classes inferiorⅤ. All the five monitoring sites don’t achieving the desired water quality standard. According to the analysis, domestic discharge, industrial activities and developed recreation were major threats to water quality of Nanhai Lake.
Highlights
Wetlands have huge environmental functions in maintaining ecological balance and regional stability due to their particular characteristics in hydrology, soil, plant, as well as landscape ecological structures
2.2 Field sampling and Laboratory analysis Water samples were collected every month from Apr., 2014 to Mar., 2015 (the twelve months are divided into wet season(Mar., Aug. and Sep.), normal season(Jan., Feb., Apr., Nov. and Dec.) and dry season(May., Jun. and Jul.)) at five sampling sites on Nanhai Lake, in the condition that without extreme weather, such as large scale rain and sand dust storm within seven days and no sudden pollution events
The assessment results determined using the water pollution index method showed that the water quality of all the five monitoring sites were inferior V(Table 3), the main contamination was COD in both the five monitoring sites because of high Water pollution index method (WPI) (COD) which ranged from 176.8 to 244.2 as presented in fig
Summary
Wetlands have huge environmental functions in maintaining ecological balance and regional stability due to their particular characteristics in hydrology, soil, plant, as well as landscape ecological structures. Water pollution index method (WPI) has been widely used to assess water quality in America[3], China [4], and Spain [5] It overcomes the problem of single factor evaluation and comprehensive water evaluation method. The comprehensive water quality identification index is a relatively new tool for general water quality assessment of surface waters, It evaluates general water quality both qualitatively and quantitatively, and evaluates water quality inferior to V, identifying whether the waters malodorous and black[6] In recently years, this method was applied widely to assessed the water quality lake and river [7,8].In this study, Water pollution index method and comprehensive water quality identification index method were selected to assess water quality of Nanhai Lake
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