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OALib Journal期刊
ISSN: 2333-9721
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三峡水库水位波动对支流库湾底栖动物群落的影响及其时滞性
DOI: 10.3724/SP.J.1145.2014.06021, PP. 101-107
Keywords: 水位波动,底栖动物,时滞性,大型深水水库,摇蚊科
Abstract:
为了解三峡水库水位波动对支流库湾底栖动物的影响，研究了自2005年起三峡水库春季和夏季水位波动对其支流库湾――香溪河库湾底栖动物群落结构的影响及其时间滞后性.分别以水位落差和水位波动率的绝对值之和表征水位波动，通过pearson相关分析研究其与底栖动物各生物参数间的相关性.结果显示，水位波动率的绝对值之和与底栖动物无显著相关关系；而水位落差（最高最低水位差）对部分底栖动物参数具显著影响（p<0.05）.春季水位落差对底栖动物影响不显著（p>0.05）.夏季水位落差对库湾下游的xx01-xx02区域内的底栖动物有显著影响（p<0.05）；库湾中部区域（三峡水库二级支流汇入区，xx05）亦受到显著影响（p<0.05）.颤蚓科（tubificidae）相对丰度随水位波动剧烈程度的上升而降低，摇蚊科（chironomidae）随水位波动剧烈程度的升高而升高，两个类群对水位波动影响的滞后时间均在15d左右.本研究表明，长江干流水位波动对其支流汇入区有明显影响，并且对二级支流的汇入区亦产生影响；此外，摇蚊科比颤蚓科更耐受剧烈扰动的水体，可以作为夏季水体扰动对底栖动物群落产生影响与否的指示因子.
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