摘要
依据2019年1月(枯水期)、5月(平水期)和7月(丰水期)西藏拉鲁湿地的采样点数据,利用改进后的内梅罗污染指数评价方法,研究不同时期拉鲁湿地水质综合状况时空变化特点,分析大致的污染物来源。结果表明,湿地不同水体环境指标浓度均表现为降低趋势,其NH_(3)-N、TP、COD和TN的平均值处于随时间推移呈现降低的趋势,而水体pH和DO的平均值表现为随时间变化先升高再降低的趋势;湿地在平水期和丰水期的水质情况比枯水期表现更为良好。枯水期,东北部表现为Ⅱ类水质,其余地区皆为Ⅰ类水质,其水质综合状况区域分布特点为由东北部向西部逐渐变好;平水期和丰水期,整体水质表现为Ⅰ类水质。枯水期,TN与NH_(3)-N存在极显著正相关(P<0.01);平水期,TP与NH_(3)-N存在显著正相关(P<0.05),TN与NH_(3)-N存在极显著正相关(P<0.01);丰水期,TN与NH_(3)-N存在极显著正相关(P<0.01)。从枯水期到丰水期,西藏拉鲁湿地水体中DO、NH_(3)-N、TP、COD和TN质量浓度分别降低了61.05%、54.55%、50.00%、2.41%和50.00%,并且其水质综合状况由枯水期到丰水期逐渐变好。拉鲁湿地东北部北入水口水体质量治理和附近的污染防治是下一步西藏拉鲁湿地水体质量治理和管控的重点。
According to the sampling data of Lalu Wetland in January 2019(dry season),May 2019(normal season)and July 2019(wet season),the improved Nemerow pollution index evaluation method was used to study the temporal and spatial variation characteristics of the comprehensive water quality of Lalu wetland in different periods,and to analyze the approximate sources of pollutants.The results showed that the concentrations of environmental indicators in different water bodies of wetland showed a decreasing trend,and the average values of NH_(3)-N,TP,COD and TN showed a decreasing trend with time,while the average values of pH and DO in water bodies showed a trend of increasing first and then decreasing with time.The water quality of wetlands in normal and wet periods was better than that in dry periods.During the dry season,the northeast showed Class II water quality,while the rest areas were Class I water quality,and the regional distribution characteristics of its comprehensive water quality were gradually getting better from northeast to west.During the normal season and wet season,the overall water quality was class I.During the dry season,there was a significant positive correlation between TN and NH_(3)-N(P<0.01).During the normal season,there was a significant positive correlation between TP and NH_(3)-N(P<0.05),and there was a very significant positive correlation between TN and NH_(3)-N(P<0.01).During the wet season,there was a significant positive correlation between TN and NH_(3)-N during the wet season(P<0.01).From dry season to wet season,the mass concentrations of DO,NH_(3)-N,TP,COD and TN decreased by 61.05%,54.55%,50.00%,2.41%and 50.00%,respectively.Moreover,the comprehensive situation of its water quality gradually improved from dry season to wet season.Water quality control and pollution prevention in the north inlet of northeast Lalu Wetland are the key points of water quality control and control in Lalu Wetland of Tibet in the next step.
作者
李梁婷
邵蓓
卓玛曲西
姜贞贞
郑琴
德珍
次巴拉松
邱豪
LI Liang-ting;SHAO Bei;Zhuomaquxi(Central Laboratory of Geology and Mineral Exploration and Development Bureau of Tibet Autonomous Region,Lhasa,Tibet 850000)
出处
《安徽农业科学》
CAS
2022年第12期67-74,78,共9页
Journal of Anhui Agricultural Sciences
关键词
水质综合状况
污染等级
内梅罗污染指数
时空变化
污染源
西藏拉鲁湿地
Comprehensive conditions of water quality
Pollution level
Nemerow pollution index
Spatio-temporal variation
Pollution source
Lalu Wetland in Tibet
