简介：ThisstudywasconductedintheHuoditangnaturally-regeneratedforest,whichislocatedatthecenterofthenaturalforestregionacrossthesouthern-slopeoftheQinlingMountains.Rainwaterandstreamwatersampleswerecollectedmainlyinrainyseasonsinthearea.ThesamplepHvaluesandchemicalconcentrationsweremeasured.Theresponseofstreamwaterchemistrytorainwateracidificationintheregionwasstudied.TheresultsshowedthatlongtimerainwateracidificationcouldresultinreductionofpHvalue,Ca2+andMg2+concentrationinthestreamwater.ThechangesofK+,Na+concentrationofstreamwaterwerenotcorrelatedwiththerainwateracidification.TherewasnoresponseofZn,PbandCdconcentrationofthestreamwatertorainwateracidification.Theacidifiedrainwaterdidnotresultinthereleaseoftheheavymetalsenrichedintheforestsoil.