三峡库区香溪河支流放流滤食性鱼类后理化特征的比较研究

Comparative Study on the Physical and Chemical Characteristics of Tributaries of Xiangxi River in the Three Gorges Reservoir after Releasing Filter-Feeding Fish

从2010年4月至2012年12月对香溪河支流7批次放流滤食性鱼类苗种1 468万尾,对放流前与放流后的水域理化因子特征进行常规监测。结果显示,放流滤食性鱼种后总氮(TN)、氨氮(NH4-N)、亚硝酸盐氮(NO2-N)、硝酸盐氮(NO3-N)、总磷(TP)、正磷酸盐磷(PO4-P)、化学耗氧量(COD)、叶绿素a要明显低于放流前,投放苗种前平均值分别为3.10 mg/L、0.421 mg/L、0.048 mg/L、2.869 mg/L、0.549 mg/L、0.299 mg/L、16.563 mg/L、26.447 mg/m3;放流鱼种后平均值分别为2.20 mg/L、0.065 mg/L、0.022 mg/L、1.643 mg/L、0.495 mg/L、0.155 mg/L、10.465 mg/L、6.608 mg/m3。放流前支流营养化TLI为67.0、放流后为56.4,香溪河支流水域呈轻度富营养化(TLI>53)。为生态修复调控水华发生建议香溪河支流水域每年放流滤食性鱼类苗种。

From April 2010 to November 2012, the physical and chemical characteristics of a tributary of Xiangxi river be- fore and after releasing 14 680 000 filter-feeding fishes by 7 batches, and the monitoring data before and after releasing fish fry were studied. The results showed that content of TN, NH4-N, NO2-N, NO3-N, TP, PO4-P,COD, chlorophyll a after the fish releasing was significantly lower than before. The value before fish releasing was 3.10 mg/L, 0.421 mg/L, 0.048 mg/L, 2.869 mg,/L, 0.549 mg/L, 0.299 mg/L, 16.563 mg/L, 26.447 mg/m3; after releasing was 2.20 mg/L, 0.065 mg/L, 0.022 mg/L, 1.643 mg/L, 0.495 mg/L, 0.155 mg/L, 10.465 mg/L, 6.608 mg/m3. The nutrition TSIM before and after releasing was 67.0 and 56.4, respectively. The tributary of Xiangxi river was mild eutrophieation（TLl〉 53）. For ecological restoration and controling the water bloom, filter-feeding fish fry should be released to the tributaries of Xiangxi river every year.