水体结冰期营养盐和叶绿素a的分布特征

Distribution Characteristics of Nutrient and Chlorophyll a during the Icebound Season

以长春市某公园景观水体为研究对象,对其在冰封过程中营养盐在冰层和水体中的存在形态、叶绿素a等的时空分布特征,以及营养盐与叶绿素a之间的关系进行研究.结果表明,冰封条件下,冰层中营养盐的含量约为水体中的1/3,叶绿素a约为水体中的1/5.水体中的氮主要以无机氮的形态存在,且ρNH4+>ρNO3->ρNO2-;磷以溶解性总磷为主;叶绿素a在冰封过程中缓慢增长.底层水体中,ρNH4+,ρTP高于上层水体.

The distribution characteristics of nutrient and chlorophyll a in the ice layer and water during the icebound season in the landscape water of a certain park of Changchun and the relationship between nutrient and chlorophyll a were studied. The results show that the content of nutrient in ice layer was about one-third that of it in water and the content of chlorophyll a in ice layer was about one-fifth that of it in water during icebound season. The inorganic nitrogen was main component part and their concentrations were ρNH4^＋〉ρNO3ˉ〉ρNO2ˉ in water; the phosphorus was mostly soluble in water; the concentration of chlorophyll a increased slowly throughout icebound season and ρNH4^＋, PTP in the low level water were higher than the corresponding ones in the high level water.