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对下蜀次生栎林不同降水组份中硫含量和ｐＨ 值进行连续的观测与分析；揭示了ＳＯ２ －４ 和ｐＨ 值在不同降水组份中的变化规律以及ＳＯ２ －４ 与其它化学成分的相互关系，结果为进一步阐明本区酸性沉降物对森林生态系统的影响提供了理论依据。
The sulfur content and pH in different precipitation components of the secondary Quercus variabilis forest were observed and analyzed continuously. The variation regularity of SO2 -4 and pH in different precipitation components and the relationship between SO2 -4 and other chemical components The results provide a theoretical basis for further elucidating the impact of acidic sediments on forest ecosystems.