摘要
贵州茂兰喀斯特原始森林地区25个雨水样品的化学组成研究表明,该区雨水的pH值为4.4～7.2,平均为5.1。雨水样品富NH4+、Ca2+和SO42-、Cl-。NH4+是最主要的阳离子,平均值为56.8μmol/L,占阳离子组成的26%～74%,Ca2+次之,平均值为14.8μmol/L,NH4+和Ca2+之和占了阳离子组成的71%～94%,SO24-是最主要的阴离子,平均值为39.2μmol/L,占了阴离子组成的69%～91%,Cl-次之,平均值为9.5μmol/L。SO42-和Cl-占了阴离子组成的71%～96%。与中国其他地区的雨水样品相比,茂兰地区雨水离子含量要低1～2个数量级;物质来源分析表明茂兰地区雨水中溶质主要来源于自然过程的输入,人为活动输入可以忽略不计。
Twenty-five rainwater samples from Maolan National Natural Reserve, Guizhou Province, have been characterized for their chemical compositions. The pH value varies from 4.4 to 7.2 （mean value is 5.1）. NH4＋ and Ca2＋ are the principal cations in the rainwater samples and their mean values are 56.8 and 14.8/μmol/L, respectively. The sum of NH4＋ and Ca2＋ accounts for 71%-94% of the total cations in the studied rainwater samples. SO24- with a mean content of 39.2 /μmol/L is the predominant anion, and Cl- with a mean content of 9.5 gmol/L is the second important one, The sum of SO4^2-- and C1- together accounts for 71%-96% of the total anions. Compared with rainwater samples of other areas in China, the ion contents of the rainwater samples of Maolan National Natural Reserve are relatively lower in 1 to 2 order of magnitude, which may suggest that the contribution of human activities is negligible and the natural inputs are the major atmospheric sources in Maolan.
出处
《矿物岩石地球化学通报》
CAS
CSCD
2008年第4期363-368,共6页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-306)
国家自然科学基金资助项目(40673010)
关键词
雨水
喀斯特森林
茂兰国家级自然保护区
贵州
rainwater karst forest Maolan National Natural Reserve Guizhou Province
