矿化度作为蒙新高原湖泊营养物基准影响指标的可行性

基于蒙新高原湖区多年综合调查资料及现场监测数据分析,结果显示蒙新湖区存在咸化趋势.多元逐步回归分析表明总磷、矿化度是影响蒙新湖区初级生产力的重要因子.相关性分析显示,蒙新高原湖区湖泊矿化度与溶解氧、pH值、总氮、叶绿素a及透明度相关,其中,溶解氧、pH值与矿化度呈极显著负相关(P<0.01);总氮、叶绿素a与矿化度呈极显著正相关(P<0.01);透明度与矿化度呈显著负相关(P<0.05).通过矿化度与国际公认的营养物基准指标原因变量(TP、TN)和反应变量(Chl-a、SD)]之间的线性关系研究表明,矿化度应成为蒙新高原湖区湖泊营养物基准影响指标之一,研究结果为确定蒙新高原湖区湖泊营养物基准的候选变量和指标提供了理论依据.

Possibility of Total Dissolved Solid as one of Nutrient Baselines in Inner Mongolia-Xinjiang Plateau

The temporal changes of total dissolved solid concentrations were analyzed according to the investigations and regular monitoring data in the Inner Mongolia-Xinjiang plateau. The result showed that the salinization process in the Inner Mongolia-Xinjiang plateau became strong. Integrated regression equation indicated that, the environmental physical and chemical factors affecting chlorophyll-a were total phosphorus and TDS. The relationship between the nutrient and biological variables was analyzed in typical examples in the Inner Mongolia-Xinjiang plateau. The results showed that, dissolved oxygen, pH, total nitrogen, chlorophyll-a, transparency were significant factors that affected TDS of the Inner Mongolia-Xinjiang plateau. It presented a significantly negative relationship(P<0.01)between dissolved oxygen, pH and TDS, whereas it presented a significantly positive relationship(P<0.01)between total nitrogen, chlorophyll-a, and TDS,and a positive relationship(P<0.05)between transparency and TDS was observed. The linear relationship between TDS, eutrophication response variables (i. e., chlorophyll-a and transparency) and reasonable variables (i. e., total phosphorus and total nitrogen) was investigated as well in this paper. The result suggested that TDS should be classified into the nutrient criteria of the Inner Mongolia-Xinjiang plateau,which provides a theoretical basis to determine the candidate variables and indicator for lake nutrient criteria in the Inner Mongolia-Xinjiang plateau.