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目的分析珠江河口水体霍乱弧菌阳性检出率与离子浓度之间关系,探讨水体中离子浓度对霍乱弧菌数量的影响。方法对2006年3月～2007年2月珠江河口24个采样点每月采样1次的霍乱弧菌数量与水体中Mg2+、K+、Ca2+、Na+浓度数据,采用Spearman秩相关函数,研究基于采样点的霍乱弧菌检出率与离子浓度之间的相关关系。结果珠江河口下游入海口区每个采样点的Mg2+、K+、Ca2+、Na+浓度年均值几乎所有的值均大于珠江河口广州城区的值,最高可达30倍。在0.05的检验水准下,广州城区霍乱弧菌阳性检出率与Mg2+浓度(rs为-0.541)显著负相关,与K+浓度(rs为0.544)和Ca2+浓度(rs为0.567)显著正相关,下游入海口区霍乱弧菌阳性检出率与Mg2+等离子浓度相关性不显著。结论在珠江河口,霍乱弧菌阳性检出率与离子浓度较低的广州城区的离子浓度存在相关关系,而与离子浓度较高的下游入海口区的离子浓度相关性不显著,提示霍乱弧菌数量与存活环境中一定的阈值范围内的Mg2+、K+、Ca2+浓度存在一定的消长关系。
Objective To analyze the relationship between the positive detection rate of Vibrio cholerae in water and the ion concentration in the Pearl River estuary so as to discuss the influence of ion concentration on the quantity of Vibrio cholerae. Methods The data of Vibrio cholerae and the concentration of Mg2 +, K +, Ca2 + and Na + in the water samples collected from 24 sampling points in the Pearl River estuary from March 2006 to February 2007 were analyzed by Spearman rank correlation function. Vibrio cholera detection rate and the correlation between ion concentration. Results The average annual values of Mg2 +, K +, Ca2 + and Na + concentrations at each sampling point in the estuary downstream of the Pearl River Estuary were all higher than those in the Pearl River Estuary in Guangzhou City, up to 30 times. At the test level of 0.05, the positive detection rate of V. cholerae in Guangzhou was negatively correlated with the concentration of Mg2 + (rs = -0.541), positively correlated with K + concentration (rs = 0.544) and Ca2 + concentration (rs = 0.567) There was no significant correlation between the positive detection rate of V. cholerae and the plasma concentration of Mg2 + in the sea area. Conclusions In the Pearl River Estuary, the positive detection rate of Vibrio cholerae is related to the ion concentration in Guangzhou metropolitan area with lower ion concentration, but not with the ion concentration in the downstream Iihai area with higher ion concentration, suggesting that Vibrio cholerae There is a certain relationship between the quantity and Mg2 +, K + and Ca2 + concentrations within a certain threshold range of living environment.