南水北调东线工程徐州段河流生境质量评价

河流生境质量评价是河流生态系统健康评价的关键之一。本文评价自然和人为作用下的河流生境质量,以南水北调东线工程徐州段丰县、邳州两市输水通道上的河流为研究对象,结合环境特点,选择了反映河道生境、河岸生境和滨岸带生境的10个指标,给出了每个指标的评价方法和5级标准特征值,建立河流生境质量评价体系,确定评价指标的等级标准,对研究区内16个河段的生境质量状况进行综合评价。结果表明:(1)河流生境质量指数(IRHQ)综合得分介于33~91。根据评价等级划分标准,其中有50%的河段生境质量达到"优"等,其余介于"良"等到"劣"等,河流生境质量整体状况良好。(2)河流生境质量指数与NH_4~+-N、COD、TN呈负相关,与DO呈正相关,多项生境指标也与水质指标具有相关性,表明生境质量与水质的相互影响。

ASSESSMENT OF RIVER HABITAT QUALITY OF XUZHOU REACH ON EAST ROUTE OF SOUTH TO NORTH WATER TRANSFER PROJECT

Assessment of river habitat quality is one of the keys to the assessment of river ecosystem healthIn this paper, an assessment system of river habitat quality was established according to environmental characteristics of rivers in Xuzhou Reach on east route of South to North Water Transfer Project in Northern Jiangsu. This system included 10 indices of river habitat quality for three different habitats (channel, bank, and riparian habitats). The results indicate that the habitat quality assessment score ranged from 33 to 91. According to the criteria of habitat quality, the scores are classified into five categories, namely excellent, good, fair, poor and very poor. The behaviors of 16 reaches were 8 "excellent", 4 "good", 1 "fair", 1"poor" and 2 "very poor", respectively. The rivers in the regions of the project possessed favorable habitat quality which varied mostly between levels of excellent and good. The comprehensive river habitat assessment indicator was negatively correlated with NH₄⁺-N , COD, TN, and positively correlated with DO. Most of habitat quality indices were also correlated with the water quality index. It was indicated the interaction between habitat quality and water quality.