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作 者 ：庞振凌,常红军,李玉英,张乃群,杜瑞卿,胡兰群

期 刊 ：生态学报 2008年 28卷 4期 页码：1810~1819

关键词：南水北调中线水源区；浮游植物生物检测；理化检测；层次分析法；水质评价；

Keywords:Danjiangkou Reservoir, the middle line project of transfer water from south to north, biological diversity index, analytical hierarchy process, water quality assessment,

摘 要 ：层次分析法（AHP）是一种多指标多因素综合评价法，其理论内容深刻而表现形式简单，包括递阶层次结构模型、判断矩阵的建立及其求值、一致性检验和综合指数计算等运算过程。在南水北调中线水源区3个采样点进行了2a的水体浮游植物和9项理化指标的检测，并应用层次分析法通过季节4因素和6项理化指标对水质进行综合评价。结果表明：层次分析综合指数PI在3采样点有差异并且变化灵敏，渠首 (陶岔S1 ) PI=0.5697，水质属于污染；库心 (小太平洋S2 ) PI=0.3619,水质属于尚清洁；丹江入库上游 (大石桥S3 ), PI=0.7755，水质属于中污染；AHP分析结果与实际基本相符。根据结果分析认为：层次分析法做为综合评价法对水质评价有重要性，值得推广应用；丹江口水库是重要的水资源，但目前水质状况并不理想，因此做好水源区的长期生态监测，加强理论和技术研究，改善水质，极为重要。

Abstract:Based on four seasons of monitoring phytoplankton communities and 9 water quality variables-total nitrogen (TN), total phosphorus (TP), chlorophyll a, chemical oxygen demand (COD), biological oxygen demand (BOD), dissolved oxygen (DO), secchi depth (SD), pH and water temperature (T) at three observatory sites, the water quality of Danjiangkou Reservoir was evaluated using Analytic Hierarchy Process (AHP). The biological diversity index showed the reservoir to be mesotrophic The water quality variables showed that the reservoir belonged to grade III according to the Environmental Quality Standard for Surface Water (GB3838-2002) of China, which suggested the reservoir status could be regarded as lightly polluted. AHP evaluation showed that the water quality was different between the three sample sites, of which the middle reservoir site was the cleanest site (pollution index =0.3619) and the upper reservoir site was the worst (pollution index =0.7755). This study indicates that more attention is required for the upstream pollution of the Danjiangkou Reservoir, and that AHP is a useful tool for water quality evaluation in surface water bodies such as Danjiangkou Reservoir.

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