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海南岛东寨港海域重金属含量检测及与海域pH和盐度之间的关系

2021-06-17张鑫郝宇

安徽农业科学 2021年2期

张鑫 郝宇

摘要 利用相关分析和通径分析考察了海南岛东寨港海水中重金属含量与海域pH、盐度之间的关系。相关分析表明,Ni、Zn、Hg含量与海域pH之间呈极显著或显著负相关;As含量与海域pH之间呈极显著正相关;Ni、Zn、Cu与海域盐度之间呈极显著或显著负相关;As与盐度之间呈极显著正相关。通径分析表明:重金属含量对海域pH的直接作用大小顺序为As>Ni>Hg>Zn>Cu>Cd>Pb;重金属含量对海域盐度的直接作用大小顺序为Ni>Pb>Cu>As>Zn>Hg>Cd。

关键词 重金属含量;pH;盐度;相关分析;通径分析

中图分类号 X55文献标识码 A

文章编号 0517-6611(2021)02-0052-04

doi:10.3969/j.issn.0517-6611.2021.02.016

开放科学(资源服务)标识码(OSID):

Detection and Relationship between Heavy Metal Content and pH,Salinity Respectively in the Sea Area of Dongzhai Harbor of Hainan Island

ZHANG Xin,HAO Yu (Hainan Geological Survey and Disign Institute,Haikou,Hainan 570206)

Abstract The relationship between heavy metal content and pH,salinity respectively in the sea area of Dongzhai Harbor of Hainan Island was studied by correlation analysis and path analysis.The result of correlation analysis showed that there was an extremely significant or significant negative correlation between content of Ni,Zn,Hg and pH of sea area respectively,as well as between content of Ni,Zn,Cu and salinity of sea area respectively,and there was an extremely significant positive correlation between content of As and pH,salinity respectively of sea area.The result of path analysis showed that,the order of direct effect of heavy metal on pH of sea area was As>Ni>Hg>Zn>Cu>Cd>Pb,and the order of direct effect of heavy metal on salinity of sea area was Ni>Pb>Cu>As>Zn>Hg>Cd.

Key words Heavy metal content;pH;Salinity;Correlation analysis;Path analysis

海南岛东寨港红树林自然保护区处于海口市和文昌市交界处,属近海及海岸湿地类型中的红树林沼澤湿地,其主要保护对象为红树林[1]。在保护区内生长着我国面积最大、种类齐全、保存最完整的成片红树林,且红树种类多达32种以上[2]。海南岛东寨港红树林自然保护区是我国建立的第一个红树林保护区,也是我国7个被列入国际重要湿地名录的保护区之一,研究该地区环境指标之间的关系对红树林和湿地保护都有着重要的意义[3-5]。研究表明,海水中的pH和盐度是制约红树植物生长分布的一个重要因子,东寨港部分红树植物生长在pH适宜且盐度高达8‰~20‰的海滩上[6-7],其海水重金属含量高低直接影响到海域中的pH和盐度变化,进而间接影响红树植物的生长[8]。海水环境是海洋生态系统的重要组成部分,它不仅能反映污染海域生态系统的稳定性,而且还具有巨大的潜在环境修复功能[9-10]。张际标等[11]研究了不同初始pH下海水中重金属……

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