Long-Term Research Page 3


The final graph below shows all the HBEF precipitation pH data currently available.

  • What do these data suggest?

  • Does it appear that precipitation acidity is increasing or decreasing over the past 30 years?

  • How is this graph different from the two previous graphs?

  • What do these three graphs show about the benefits of long-term research?

It is important to note that while precipitation at the HBEF has become slightly less acidic over the past 40 years, it is still much more acidic that pure rain, and is still negatively affecting the forest health. You will learn more about acid rain later in the Introduction tour.


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