中文摘要：

2014年6—8月分别对丽江-玉龙雪山索道区,甘海子,丽江市区,龙蟠镇等4个地区进行降水采集,共采集87个样品,对主要化学离子（Na＋、K＋、NH4＋、Ca2＋、Mg2＋、SO42-、Cl-、NO3-）电荷浓度进行分析.结果表明,离子总浓度丽江市区〉龙蟠镇〉甘海子〉索道区.阳离子含量最高的为Ca2＋和NH4＋,阴离子含量最高的为SO2-4.分析1997—2014年丽江降水离子含量,SO42-与NO3-的比值逐年下降,表明旅游业和交通运输业对丽江大气环境质量影响显著.采用主因子分析法进行分析,NH4＋、SO42-、NO3-在第一因子中为高载荷,受人类污染的影响,Na＋与K＋、Cl-在第二因子中高载荷,受海洋源影响.Ca2＋、Mg2＋在第三因子中高载荷,受陆地源影响.

英文摘要：

From June to August of 2014,a total of 87 rainwater samples were collected from glacial park（at Yulong Snow Mountain）,Ganhaizi Basin,Lijiang City and Longpan Town.The major ions（Na＋,K＋,NH4＋,Ca2＋,Mg2＋,SO42-,Cl-,NO3-） of the samples were analyzed.The results showed that the total ion concentration decreased in the following order：Lijiang City 〉 Longpan Town 〉Ganhaizi Basin 〉 glacial park.Ca2＋and NH4＋had the highest concentrations among cations,and SO42-was the dominant anion.In addition,our result showed that the ratio of SO42-to NO3-decreased gradually in rainwater from 1997 to 2014,indicating that transportation and tourism had a great impact on the quality of atmospheric environment in Lijiang city.We also used factor analysis methods to investigate the source of chemical ions in the precipitation.We found that NH4＋,SO42-,NO3-were high loaded in the first factor.They were closely related to anthropogenic emissions.Na＋,K＋,Cl-were high loaded in the second factor.They were mainly originated from sea salt particulates.Ca2＋and Mg2＋were high loaded in the third factor.They were mainly from local dust.