重庆缙云山降水化学组成的季节变化特征分析  

Analysis on Seasonal Variation of Chemical Composition of Rainfall in Jinyun Mountain, Chongqing, China

作　　者：魏虹[1] 王建力[2] 李旭光[1] 

机构地区：[1]西南师范大学生命科学学院 [2]西南师范大学资源环境科学学院

出　　处：《西南师范大学学报（自然科学版）》2005年第4期725-729,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：西南师范大学自然科学基金资助项目

摘　　要：对重庆缙云山自然保护区1998 1999年126个降水雨样的主要化学组成成分特征和季节变化特点进行了分析研究.结果表明,缙云山降水pH平均值为5.23,电导率为33.90μs/cm,降水的酸化与污染程度低于重庆市市区.降水pH值和各主要离子表现出明显的季节变化特征,总体表现为冬、春季污染程度高于夏秋季,这可能与降水量的季节分布等有关.降水中NH4+和Ca2+的大量存在极大地中和了酸根离子(SO42-、NO3-、Cl-)对雨水的酸化作用,提高了降水pH,降低了酸雨发生频率.降水pH与各主要离子在冬季表现出显著的负相关关系.碱性阳离子(K+、Na+、Ca2+、Mg2+、NH4+)与SO42-的相关性在冬季极为显著,在夏季则较弱.电导率与SO42-的相关性表现出同样的季节变化特点.The chemical characteristics of rainfall and its seasonal variation in Jinyun Mountain were studied sampled between April 1998 and November 1999. The average pH of rainwater samples was 5.23 and the conductivity was 33.90 μs/cm, which showed the situation of air pollution in Jinyun Mountain was less than that in Chongqing urban. Seasonal variations for some major ions （K^＋、Na^＋、Ca^2＋、Mg^2＋、NH4^-、SO4^-、NO3^-、Cl^-） and pH were pronounced. Generally, maximum concentrations appeared in winter or spring and minimum concentrations in summer or autumn seasons. The average pH of the samples higher than that in Chongqing urban areas was due to the neutralization of NH4^＋ and Ca^2＋ ions. There was a strong relationship between pHs and other ions in winter. However, in summer, a weak relationship was found between SO4^- and alkalinic cations. On the other hand, relationships between the conductivity and SO4^- concentration were stronger in winter than in summer.

关 键 词：缙云山 酸雨 PH值 离子成分 季节变化 

分 类 号：Q946[生物学—植物学]