Temporal and spatial distribution of chlorophyll-a concentration and the relationships with TN, TP concentrations in Lake Ulansuhai, Inner Mongolia

采用2005-2007年乌梁素海监测数据,对乌梁素海水体中叶绿素a浓度的时空分布进行分析,并对叶绿素a浓度与总氮、总磷浓度相关关系进行研究,结果表明:乌梁素海叶绿素a浓度具有明显的时空分布特征,在时间上,5月份>7、8月份>10月份>9月份>6月份,可以看出5月份、10月份叶绿素a浓度偏高,其原因是乌梁素海特殊的地域性,补水来源主要为河套灌区的农田退水,5月份、10月份正处于春浇秋灌时期,农田退水携带充足的氮磷元素进入乌梁素海,使藻类迅速增长繁殖;在空间上,北部区>南部区.通过分析得出,2006年叶绿素a与氮、磷浓度的相关关系在5月、10月存在明显的相关性,8月份相关性较小,其他月份无明显相关性.;This paper based on the conventional monitoring data from in 2005–2007, and studied the distributing of chlorophyll-a with temporal and spatial distribution, and the relationship between the chlorophyll-a and TN, TP concentrations. The results showed that chlorophyll-a concentration appeared obvious temporal and spatial changes, and the values were arranged according to May>July, August>October>September>June. Chlorophyll-a concentration of May and October higher than others. The supply water of Lake Ulansuhai occurred form drainage of Hetao in May and October, and there is a lot of nutrition was bring into Lake Ulansuhai, which induced growth of algae. By analyzing, the relationships between chlorophyll-a concentration and TN and TP concentration appeared evidently in May and October of 2006, and the relationships in August were not remarkable, and no relationship in other months