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通过2015年1月、4月、7月、10月水温、电导率、溶解氧、pH及叶绿素a监测数据对水体温度的季节动态及其垂直分层结构进行分析,探讨了泸沽湖水体水化学性质的季节性分层特征。结果表明:泸沽湖水体在春、夏、秋季出现明显的热力分层现象,冬季水温在垂向上接近同温状态,夏季温跃层位于10~25 m水深处,而秋季温跃层下移至20~30 m处。均温层水温维持在9.5~10℃与泸沽湖年均温一致,说明均温层水体稳定且处于相对恒温状态,是湖区年均温的反映。热力分层结构对电导率、溶解氧、pH及叶绿素a变化有一定影响,致使水体电导率、溶解氧、pH出现明显的分层现象,尤其在夏季,气温升高,热力分层现象显著,溶解氧和pH在温跃层内出现峰值,自峰值处向上、向下均呈递减趋势,均温层处于缺氧状态且p H值较小。虽然叶绿素a在温跃层以下维持较低水平,整体不高,但在表层有突然增高的现象,应予以高度警示,防止泸沽湖出现大面积藻类繁殖甚至局部性爆发。电导率垂向上呈递减变化,在温跃层内降低幅度较大。泸沽湖水体盐度基本保持恒定(约0.10‰),在不考虑盐度效应的情况下,无论是在垂直断面上还是在变温层、温跃层及均温层中,电导率与水温之间存在一简单线性函数关系,证明泸沽湖仍受自然气候影响,保持自然水体状态。
The seasonal dynamics of water temperature and its vertical stratification structure were analyzed by the monitoring data of water temperature, conductivity, dissolved oxygen, pH and chlorophyll a in January, April, July and October 2015. The effects of water chemistry The nature of the seasonal stratification. The results show that the water bodies in Lugu Lake show obvious thermal stratification in spring, summer and autumn. The winter water temperature is close to the same temperature in vertical direction, the summer thermocline is located at the depth of 10-25 m, and the autumn thermocline moves downward to 20 ~ 30 m Department. The average temperature of the stratosphere is maintained at 9.5 ~ 10 ℃, which is consistent with the annual average temperature of Lugu Lake, indicating that the water body in the stratosphere is stable and relatively constant in temperature, reflecting the annual average temperature in the lake. The thermal stratification structure has certain influence on the changes of conductivity, dissolved oxygen, pH and chlorophyll a, resulting in obvious stratification of water conductivity, dissolved oxygen and pH. Especially in summer, the air temperature rises and the heat stratification phenomenon is remarkable. Dissolved oxygen and pH peaked in the thermocline, decreasing upwardly and downwardly from the peak value, while the temperature was in an anoxic state with a low p H value. Although chlorophyll a maintains a low level below the thermocline and the whole is not high, a sudden increase in the surface layer should be highly warned to prevent large-scale algal blooms and even local outbreaks in Lugu Lake. Conductivity showed a decreasing trend in the vertical direction, and a larger decrease in the thermocline. The salinity of the Lugu Lake water body basically remains constant (about 0.10 ‰). Regardless of the salinity effect, both in the vertical section and in the temperature change layer, the thermocline layer and the temperature averaging layer, between the conductivity and the water temperature There exists a simple linear function, which proves that Lugu Lake is still affected by natural climate and maintains the natural water body state.