大辽河口营养物基准值的制定方法及其影响因素研究

发布时间：2018-05-29 05:12

本文选题：大辽河口 + 营养物基准值　；参考：《中国海洋大学》2015年硕士论文

【摘要】：营养物基准是水质基准的重要组成部分,它的制定和应用是为了防止水体富营养化。营养物基准不仅是开展营养物监测、评估和管理的基础,而且为营养物标准的研究与制订提供理论基础和方法借鉴。美国系统研究了河流、湖库、河口和近岸海域及湿地营养物基准制定的理论方法,我国对湖泊营养物基准的制定进行了一些研究,而对河口营养物基准的制定研究较少。本文结合现场调查数据和室内模拟结果,研究了大辽河口营养物基准值的制定方法及其影响因素,得到的主要结论如下：(1)用频数分布法得到大辽河口TN、TP、DIN和P043-的基准值分别为110.1、1.33、63.8和0.28 μmol·L-1,Chl-a的基准值为2.50μg·L-1：用Chl-a为2.50μg·L-1作为响应阈值,根据简单线性回归模型得到大辽河口TN和TP的基准值分别为26.2 μmol·L-1和1.01 μmol·L-1;根据室内模拟结果,用非线性拟合法得到大辽河口TN、TP、DIN和P043-的生态基准值分别为25.9、3.99、16.8和1.19μmol·L-1。三种方法得到的TP和TN基准值都在地表水环境质量标准的范围内。(2)盐度为15、25和31时,大辽河口DIN基准值分别为26.1、19.5和19.9μmol·L-1,TN的基准值分别为40.3、30.1和30.6 μmol·L-1,PO43-的基准值分别为1.10、0.94和1.06 μmol·L-1,TP的基准值分别为3.69、3.15和3.56 μmol·L-1。盐度变化对P043-和TP基准值影响不明显,盐度变化对DIN和TN基准值影响显著,过高或过低的盐度都会使其基准值增大,这与盐度影响浮游藻对营养盐的吸收利用率、生长代谢、渗透压及细胞外碳酸酐酶(CA)的活力等因素有关。(3)P043-浓度变化对DIN生态响应值具有重要影响,随着P043-浓度的增大,DIN响应值逐渐增大,DIN响应值随着P043-浓度的变化曲线近似“S”型；DIN浓度变化对P043-生态响应值也有影响,随着DIN浓度增大,P043-响应值也逐渐增大,P043-响应值随着DIN浓度的变化不是很明显。
[Abstract]:Nutrient standard is an important part of water quality standard, and its development and application is to prevent eutrophication. Nutrient benchmark is not only the basis of nutrition monitoring, evaluation and management, but also provides theoretical basis and method for the study and formulation of nutrition standards. The United States has systematically studied the theoretical methods for the formulation of nutrient standards for rivers, lakes, estuaries and coastal waters and wetlands. In China, some studies have been carried out on the formulation of nutrient standards for lakes, but few studies have been made on the formulation of nutrient standards for estuaries. Based on the field investigation data and the results of indoor simulation, this paper studies the formulation method of nutrient reference value and its influencing factors in Daliao Estuary. The main conclusions are as follows: (1) using the method of frequency distribution, the datum values of TPDIN and P043- are 110.1 mol 1.33 渭 g / L 63.8 and 0.28 渭 mol / L ~ (-1) Chl-a, respectively, which are 2.50 渭 g / L ~ (-1) and 2.50 渭 g / L ~ (-1) of Chl-a, respectively. According to the simple linear regression model, the basic values of TN and TP were 26.2 渭 mol L-1 and 1.01 渭 mol L-1, respectively, and the ecological datum values of TNTP-DIN and P043- were obtained by non-linear fitting method in Daliao Estuary of Daliao River Estuary, and the ecological reference values of TN and TP in Daliao Estuary were 25.9 渭 mol / L ~ (-1) and 1.19 渭 mol / L ~ (-1), respectively. The standard values of TP and TN obtained by the three methods are within the range of environmental quality standards of surface water. The DIN datum values of Daliao Estuary are 26.1U 19.5 and 19.9 渭 mol L-1TN, respectively, 40.3 渭 mol 30.1 and 30.6 渭 mol L-1 PO43-, which are 1.100.94 and 1.06 渭 mol L ~ (-1) TP, respectively, 3.69U ~ (3.15) and 3.56 渭 mol ~ (-1) ~ (-1). The change of salinity had no significant effect on the standard values of P043- and TP, but the change of salinity had a significant effect on the DIN and TN datum values. Too high or too low salinity would increase the reference values, which was related to the salinity effect on the uptake and utilization of nutrients, growth and metabolism of phytoplankton. The osmotic pressure and the activity of extracellular carbonic anhydrase (CAA) were related to the concentration of P043-, which had an important effect on the ecological response of DIN. With the increase of P043- concentration, the DIN response value gradually increased with the P043- concentration changing curve approximate to "S" DIN concentration change, and the P043- ecological response value was also affected by the change of DIN concentration. With the increase of DIN concentration, the response value of P043- and the response value of P043- increased gradually. The change of P043- response value with the concentration of DIN was not obvious.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X522

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