乌梁素海水体透明度分布及影响因子相关分析

Spatial-temporal changes in water transparency and its impact factors in Lake Wuliangsuhai

根据2006-2008年间5-10月对乌梁素海的连续监测资料,分析了乌梁素海水体透明度的时空分布状况和季节变化规律,对影响透明度的5个理化因子,包括浊度、悬浮物、叶绿素a、氮磷比和pH值进行相关分析.三年内有监测资料的月份中,乌梁素海水体透明度变化范围在0.33-1.62m,平均值为0.93m,透明度分布的总体趋势是芦苇区及靠近芦苇区较低,西南端开阔水面区较高.从相关分析结果来看,浊度是乌梁素海水体透明度的主要影响因素,其与透明度的关系是SD=1.489x-0.471(R=0.83,N=100,P<0.0001);悬浮物是乌梁素海水体透明度的直接影响者,与透明度的关系是S1/4=-3.948lnSD+12.055(R=0.65,N=100,P<0.0001);pH值和N/P对透明度的影响是间接的.

The spatial distribution, temporal changes of water transparency and relationship between transparency and turbidity, suspended substance, chlorophyll-a, radio of total nitrogen and total phosphate, pH were analyzed based on monthly （May-October） monitoring data in Lake Wuliangsuhai from 2006 to 2008. The results indicated that the water transparency in Lake Wuliangsohai in 2006 to 2008 ranged from 0.33m to 1.62m with a mean value of 0.93m, and the distribution trend of transparency took on increasing from the northeast to the southwest. The correlation analysis results showed that turbidity and the amount of suspended substances are two significant factors that affected the transparency. Their regression functions can be represented as SD=1.489x-0.471 （R=0.83, N=100, P〈0.0001） and SI/4=-3.9481nSD＋12.055 （R=0.65, N=100, P〈0.0001） respectively.