The objective of this paper is to examine the relations between acid rain and element content in the rings of a native species Pinus massoniana , which is sensitive to acid rain pollution in Dinghushan Nature Reserve (DNR), located in one of the areas with quickest industrial growth and severest acid rain pollution in China. Substantial decline of the pH of the precipitation and an even faster increase in the frequency of acid precipitation occurred in the last two decades in the area. We expect this to ...