南水北调东线工程输水干线土壤成分测定

Analysis of soil components along water channel of east route of South-to-North Water Diversion Project

目的：探讨南水北调东线干渠途经地区土壤成分与钉螺孳生的关系。方法在工程沿线地区选取4个研究点，采集土壤标本，检测其中的化学元素、有机质和总氮等成分含量，分析影响钉螺生存繁殖的土壤因素。结果除锌、钠、磷、密度外，存活钉螺所暴露的土壤成分含量均有异于死亡钉螺所暴露的土壤，差异有统计学意义（t=-19.150～12.810，P均〈0.01）。但Logistic回归分析未得出有统计学意义的模型。结论钉螺适于生活在有机质丰富、pH值偏中性的土壤中。随着全球气候变暖及南水北调工程的运行，钉螺有可能在北方受水地区孽生，应加强对长江水流经地区的螺情监测。

Objective To explore the relationship between the soil components along the areas of the east route of the SouthtoNorth Water Diversion Project and the survival situation of Oncomelania hupensis snails. Methods Four study sites were selected along the project,and soil samples were collected to analyze the components. The amounts of components among the different study sites were compared statistically. Results Except zinc,sodium,and phosphorus,the contents of the soil components where the snails survived were different from those where snails were dead（t=-19.150 to 12.810,all P〈0.01）. However,the logistic regression analysis did not obtain a model with statistical significance. Conclusions O. hupensis snails live in the soil with adequate organic matter and neutral pH value. Along with the global warming and the operation of the SouthtoNorth Water Diversion Project,O. hupensis snails may survive in the northern area,and therefore,the surveillance work should be strengthened.