1. Inorganic Nutrient Research Kellogg Biological Station LTER o Soils in managed agricultural systems and unmanaged fields and forests: o Carbon and nitrogen stocks o Available nitrogen o Soil-atmosphere exchanges of CO 2, N 2 O and CH 4 o Headwater streams, wetlands: o Nutrients o Major solutes o Lakes o Nutrients and chlorophyll o Major solutes o NADP/NTN precipitation chemistry site o But there is not a lot of interest in acid deposition nowadays…

2. Recent Key Findings - Inorganic Nutrients Kellogg Biological Station LTER o Yet precipitation chemistry has been changing dramatically! o Increasing pH o Decreasing nitrate and esp. sulfate o Streams are beginning to reflect these changes o Happening across the US

3. Synthesis idea - Inorganic Nutrients Kellogg Biological Station LTER o Hypothesized responses to decreasing acidification include: o Reduced acid/Al stress on vegetation o Reduced acid/Al stress on aquatic biota in poorly buffered waters o Altered mineral weathering, lower Ca leaching losses from soils o Altered stream fluxes of S, Ca, alkalinity, maybe N and dissolved organic matter (DOM) o Are we measuring the right variables to detect ecosystem responses to this dramatic change in precipitation chemistry? o Soil solution chemistry o Lake and wetland chemistry and biotic responses o Stream export of N, S, Ca, alkalinity, DOM…