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The chemical composition of rainwater has been studied in a karst rural area from September 2012 to August 2013 in Guizhou Province,Southwest China.The results indicated that the VWM value of p H was 5.4,varied from 4.6 to 6.9.Ca~(2+)and NH_4~+were the major cations,and SO_4~(2-)was the dominant anion.Neutralization factors show that the acid was mainly neutralized by Ca~(2+),NH_4~+and Mg~(2+).Investigations of correlation coefficients and enrichment factors revealed that Ca~(2+)and Mg~(2+)were mainly crust origins,and NH_4~+was from agriculture and livestock manure.SO_4~(2-)and NO_3~-were mainly from anthropogenic sources.
The chemical composition of rainwater has been studied in a karst rural area from September 2012 to August 2013 in Guizhou Province, Southwest China. These results indicate that the VWM value of p H was 5.4, varied from 4.6 to 6.9. Ca ~ (2+ ) and NH_4 ~ + were the major cations, and SO_4 ~ (2-) was the dominant anion. Neutralization factors show that the acid was mainly neutralized by Ca ~ (2 +), NH_4 ~ + and Mg ~ (2+). Investigations of correlation coefficients and enrichment factors revealed that Ca ~ (2+) and Mg ~ (2+) were mainly crust origins, and NH_4 ~ + was from agriculture and livestock manure.SO_4 ~ (2-) and NO_3 ~ -were mainly from anthropogenic sources.