乌鲁木齐河新疆裸重唇鱼栖息地适宜度初步评价

Assessment of Habitat Suitability Index of Gymnodiptychus dybowskii in Urumqi River

基于对乌鲁木齐河河源区的鱼类及栖息地的调查研究,选择该水域的优势种新疆裸重唇鱼作为指示物种,建立新疆裸重唇鱼对水深、水温、流速、溶解氧、pH和总碱度的栖息地适宜度曲线,并借鉴河道内流量增量法(IFIM)计算各采样点位的新疆裸重唇鱼栖息地适宜度指数HSI。结果表明:6个评价指标在栖息地适宜度指数的权重大小依次为水温、总碱度、溶解氧、水深、流速和pH。栖息地适宜度指数在空间上,具有中上游较高,下游较低的特征,主要由于下游水域人为干扰因素较多(引水调水、工业污染);在时间上,栖息地适宜度指数表现为夏季较高,冬季较低的特征,与乌鲁木齐河典型的冰川冻雪水源有较大关联。

According to the research on habitat of fish in headwater of Urumqi River, the dominant species Gymnodiptychus dybowskii （ Kessler） was selected as biological indicator. Suitability curves of depth, temperature, velocity, dissolved oxygen, pH and total alkalinity was established. Moreover, the habitat suitabil-ity index （ HSI） of G. dybowskii at in each site was calculated using Instream Flow of incremental Methodology （ IFIM）. The result showed that the descending order of 6 metrics by weight on HSI was temperature, total alka-linity, dissolved oxygen, depth, velocity, and pH. HSI was lower in dawn streams than it is in upper reaches, for its suffering more disturbances from human activity such as industrial pollution, river diversions. Otherwise, HSI was higher in summer, because of the melting ice is the main water source of Urumqi River.