| 西藏拉鲁湿地不同时期水质现状及污染评价 |
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| 引用本文： | 田瀚鑫,王佳俊,周磊,徐德福,张建伟,彭措次仁.西藏拉鲁湿地不同时期水质现状及污染评价[J].环境工程,2021,39(6):198-206. |
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| 作者姓名： | 田瀚鑫 王佳俊 周磊 徐德福 张建伟 彭措次仁 |
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| 作者单位： | 1. 南京信息工程大学 环境科学与工程学院, 南京 210044; |
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| 基金项目： | 拉萨市城关区拉鲁湿地生态专题项目（2018h309）；江苏省自然科学基金项目（BK20141477）；江苏高校"青蓝工程"项目（20161507）；江苏省"六大人才高峰"项目（JNHB-057） |
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| 摘 要： | 采用现场调查和室内分析相结合的方法，于2018年12月（枯水期）与2019年5月（丰水期）分别分析了拉鲁湿地的水质，并采用改进的内梅罗污染指数法对2个时期的水质现状进行了评价。结果表明:在枯水期，TN、TP和NH3-N分别为0.157~26.797，0.003~4.259，0.197~24.084 mg/L；pH、电导率和溶解氧分别为6.99~9.55，72.85~583.50μS/cm和1.83~12.84 mg/L。在丰水期，TN、TP和NH3-N分别为0.077~3.104，0.004~0.228，0.005~0.094 mg/L；pH、电导率和溶解氧分别为6.94~9.27，129.90~512.87μS/cm和1.12~12.18 mg/L。拉鲁湿地枯水期水体的电导率平均值低于丰水期，但枯水期的溶解氧、pH、TN、TP、NH3-N和COD的平均值高于丰水期；电导率与pH呈极显著负相关（P<0.01），与NH3-N和TP呈极显著正相关（P<0.01）。改进的内梅罗污染指数法表明拉鲁湿地枯水期水质大部分为Ⅴ类，其受污染区域主要分布在东北部，丰水期水质主要为Ⅰ和Ⅲ类，其水质污染区域主要分布在中南部。
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| 关 键 词： | 拉鲁湿地 水质 污染等级 内梅罗污染指数 插值分析 |
| 收稿时间： | 2020-04-13 |
WATER QUALITY STATUS AND POLLUTION ASSESSMENT OF LHALU WETLAND IN TIBET IN DIFFERENT PERIODS |
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| Abstract: | The water quality of Lhalu wetland was analyzed in December 2018(dry season) and May 2019(wet season), based on field investigation and indoor analysis.Resultsshowed that total nitrogen, total phosphorus and ammonia nitrogen were 0.157~26.797 mg/L, 0.003~4.259 mg/L and 0.197~24.084 mg/L, and pH, conductivity and dissolved oxygen were 6.99~9.55, 72.85~583.50 μS/cm and 1.83~12.84 mg/L, respectively, during the dry season. Total nitrogen, total phosphorus, ammonia nitrogen, pH, conductivity and dissolved oxygen were 0.077~3.104 mg/L, 0.004~0.228 mg/L, 0.005~0.094 mg/L, 6.94~9.27, 129.90~512.87 μS/cm and 1.12~12.18 mg/L, respectively, in wet season. The average conductivity of the water body from Lhalu wetland was lower in dry season than in wet season. However, higher average dissolved oxygen, pH, total nitrogen, total phosphorus, ammonia nitrogen and COD concentrations were found in dry season than in wetland season. The average conductivity of the water body was significantly negatively correlated with pH(P<0.01), but it was significantly positively correlated with ammonia nitrogen and total phosphorus(P<0.01).Resultsfrom improved Nemero Pollution Index evaluation method showed that the water quality of Lhalu wetland was mostly Class V during the dry season and pollutant were mainly distributed in the northeast areas of Lhalu wetland; the water quality was mainly Class I and Ⅲ during the wet season, and pollutants were mainly distributed in the central and southern area of Lhalu wetland. |
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