我国若干湖泊磷转化率的区域差异性研究

湖泊生态分区有利于其富营养化控制,湖泊营养盐流动特征是湖泊生态分区的重要指标之一,通过线性回归和模型分析相结合的方法,对表征我国湖泊营养盐流动特征的磷最大转化率指标开展了研究.结果表明,我国湖泊总磷(TP)向叶绿素a(Chl-a)转化的最大转化率(Rmax)模型为Rmax= k0/(1-η)(k0和η分别代表TP与Chl-a现存量线性回归方程的斜率和生态系统中磷传递效率),不同湖泊磷最大转化率与所在地多年平均积温显著相关,显著影响磷转化率的积温阈值范围为3400~4730oC·d,该积温阈值可判定我国不同区域湖泊生态系统中磷流动速率的快慢,表征我国湖泊磷的流动速率区域差异性.

The regional differences of phosphorus transfer rate in some lakes of China

Lake ecological division does benefits to controlling eutrophication, and nutrient flow characteristic is an essential index to lake ecological division. The phosphorus maximum transfer rate, an index that characterizing nutrient flow in lake ecosystem, was calculated in China by linear regression and model analysis. The results showed that the maximum transfer rate (from TP to Chl-a) could be modeled as Rmax = k0/(1-η)(Rmax, k0 and η represent the capacity of transforming TP into the actual primary productivity (Chl-a), the slope of linear regression betweenTP and Chl-a contents of the 28 lakes in multiyear, and the phosphorus transfer rate, respectively). The phosphorus flow characteristics in China was significantly correlated with accumulated temperature and could be judged through an accumulated temperature threshold from 3400℃·d to 4730℃·d, which indicated obvious regionalization characteristics for phosphorus flow rates in China.