升金湖叶绿素a浓度的时空变化特征

摘要

根据2013年1月、4月、8月和11月的监测数据，对升金湖叶绿素a浓度的时空分布特征及其与主要的环境因子的关系进行研究。结果表明，升金湖水体中叶绿素a分布具有明显的时间异质性，其季节变化范围为0.28～30.39μg／L，平均值为（6.83±5.60）μg／L，最小值出现在冬季，最大值出现在秋季。叶绿素a浓度在冬、春季较低，夏、秋季较高。在空间分布上，叶绿素a浓度具有明显的空间异质性，即在下湖区最高，其次是中湖区，上湖区最低。 Pearson相关性分析和PCA分析表明，升金湖叶绿素a浓度与水温、溶解氧及浊度均呈极显著相关，与总磷也具有一定的相关性。%Seasonal and spatial variation of chlorophyll-a concentration and its relationships with the main environmental factors in Shengjin Lake in January , April, August and November of 2013 were investigated .Results showed that the obvious seasonal variations were observed in chlorophyll-a concentration in Shengjin Lake .The concentration of chlorophyll-a ranged from 0.28 μg/L to 30.39μg/L with an average value of (6.83 ±5.60 ) μg/L.The minimum and maximum of chlorophyll-a concentrations were recorded in winter and autumn , respectively .The chlorophyll-a concentrations were relatively lower in winter and spring while much higher in sum-mer and autumn .It also was found to have significant spatial heterogenity in chlorophyll-a concentration .The chlorophyll-a concentra-tions were the highest in the lower lake of the Shengjin Lake , followed by the middle and the upper lake .Pearson correlation analyses and Principal component analysis ( PCA) revealed that the chlorophyll-a concentration in Shengjin Lake showed a significant correlation with water temperature , dissolved oxygen , and turbidity , while correlated with total phosphorus .