养殖尾水循环渠中底泥微囊藻毒素含量与水化指标的相关关系分析

Correlations between Microcystin Content in Sediment and Key Hydration Factors of Aquaculture Tailwater Circulation System

近年来,随着池塘养殖业的不断发展,富营养化引起的蓝藻水华已成为一个严重的问题,蓝藻水华产生的微囊藻毒素污染因其毒性效应而引起了人们的广泛关注。为研究底泥中微囊藻毒素与关键水化指标间的相关关系,本试验在蓝藻爆发盛期循环水养殖系统的养殖尾水循环渠中,设置3个采样点,每2 d采样1次,共进行10 d,分别分析底泥中微囊藻毒素(MC-RR、MCLR)含量和水化指标(TN、TP、COD)。结果表明,试验期间水中TN、TP、COD含量的变化范围依次为0.26～0.66,0.23～0.60,6.23～7.86 mg·L^(-1);MC-RR、MC-LR以及MCs含量的变化范围依次为0.53～0.86,0.01～0.68,0.87～1.34μg·g^(-1);MC-RR与TN、TP、COD正相关,与N/P负相关,MC-LR与TN、TP、COD、N/P负相关,MCs与TP正相关,与TN、COD、N/P负相关,其中除MCs与TN相关关系显著(P<0.05)外,其他相关关系均未达显著水平(P>0.05)。

In recent years, with the increasing development of pond aquaculture, cyanobacterial blooms caused by eutrophication have become a severe issue, in which the microcystin pollution causing by cyanobacterial blooms has attracted much attention due to their toxic effects. To study the correlations between microcystin content in sediment and key hydration factors of aquaculture tailwater, the experiment was conducted at the peak of cyanobacterial outbreak, three sampling points were set up and sampled once every 2 days for 10 days, the content of microcystin in sediment (MC-RR, MC-LR) and the key hydration factors (TN, TP, COD) were determined. The results showed that the contents of TN, TP and COD in water varied from 0.26 to 0.66 mg·L^-1, from 0.23 to 0.60 mg·L^-1, and from 6.23 to 7.86 mg·L^-1, respectively. The contents of MC-RR, MC-LR and MCs varied from 0.53 to 0.86 μg·g^-1, from 0.01 to 0.68 μg·g^-1, and from 0.87 to 1.34 μg·g^-1, respectively. MC-RR was positively correlated with TN, TP, COD and negatively correlated with N/P, MC-LR was negatively correlated with TN, TP, COD, and N/P, MCs was positively correlated with TP, but negatively correlated with TN, COD, and N/P , in which the correlation between MCs and TN was significant(P<0.05) but other correlations were not significant (P>0.05).