By Gene E. Likens, F. Herbert Bormann (auth.), Gene E. Likens (eds.)
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Extra info for An Ecosystem Approach to Aquatic Ecology: Mirror Lake and Its Environment
0 O~~~--~--~--~--~--~--~--~--~--~--~--~ 01 e 01 e eu '1 11 7 0"" J J I A S 0 N I 0 I J I F I M A I M Month sample, they did not contribute significantly sources of dust are negligible and seemingly un( <5%) to the free proton concentration of the changed during the period. Hence the explanation for the decline in these two basic cations is precipitation at Hubbard Brook. The volume-weighted annual concentrations unknown. The pattern for K+ is largely deterfor some ions in precipitation have changed sig- mined by the values in 1963-65, a drought penificantly since the beginning of our study in riod.
As water percolates through the canopy and soil zone, its chemistry is altered. B-20). Both phosphorus and DOC concentrations in soil solution increase dramatically in the forest floor, but rapidly decrease to concentrations (~3 mg C/ liter) in the mineral soil, which are similar to stream-water concentrations (Wood 1980; McDowe111982). The P and DOC from forest floor soil solution are rapidly adsorbed by the upper B-horizon of the mineral soil, which thereby provides a powerful regulating mechanism for stream or drainage water chemistry and watershed-ecosystem outputs.
The record of measurements at Hubbard Brook is the longest in North America. Whereas at some other sites there has been some increase or decrease in pH values with time, only small changes have been observed at Hubbard Brook (see Likens et al. 1979, 1984). 10) decline in annual volume-weighted H+ concentration after 1970- B. Biogeochemistry 37 71. Also the range of concentration in weekly appreciably more acid than the remaining porsamples has narrowed, and the distribution has tions (Hornbeck et al.
An Ecosystem Approach to Aquatic Ecology: Mirror Lake and Its Environment by Gene E. Likens, F. Herbert Bormann (auth.), Gene E. Likens (eds.)