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2010年三峡大坝首次成功蓄水到175m.为了探讨175m蓄水对库区支流鱼类食物网能量来源的影响,采用稳定性同位素方法并结合多源线性混合模型(IsoSource模型)对小江回水区鲫、鲤、蒙古鲌、鲇、大鳍鳠、瓦氏黄颡鱼、光泽黄颡鱼等7种主要经济鱼类能量来源进行了分析.结果表明:蓄水前(2010年7月),微型藻类是7种主要经济鱼类能量的主要来源;蓄水后(2010年12月),微型藻类对7种主要经济鱼类能量来源的贡献比例略有下降,而陆生C4植物的相对贡献比例明显增加,特别是对杂食性鲫和肉食性鲇的贡献率分别达到了38%～54%和32%～50%.蓄水后,鲫和鲇至少有30%的能量来自陆生C4植物.说明三峡大坝的蓄水过程增加了外源性C4植物对鱼类能量的贡献比例.
For the first time, the Three Gorges Dam impounded water to 175m in 2010. In order to investigate the effect of 175m impoundment on the energy sources of tributary fish food web in the reservoir area, the stable isotope method and the multi-source linear mixed model (IsoSource model) The results showed that the energy sources of seven major economic fishes, including crucian carp, common carp, Mongolian pomfret, pomfret, big fin pomfret, yellow pomfret, yellow pomfret, etc. were analyzed.The results showed that before the water storage (July 2010) Microalgae are the main sources of energy for seven major economic fish species. After water storage (December 2010), the contribution of microalgae to the energy sources of seven major economic fish species declined slightly, while the relative contribution of terrestrial C4 plants The proportion increased significantly, especially for omnivorous crucian carp and carnivorous 达 contribution rates reached 38% to 54% and 32% to 50% .After water storage, crucian carp and 鲇 at least 30% of the energy from terrestrial C4 plants This shows that the water storage process of the Three Gorges Dam has increased the contribution of exogenous C4 plants to fish energy.