When we originally published Biogeochemistry of a Forested Ecosystem in 1977, the Hubbard Brook Ecosystem Study (HBES) had been in existence for 14 years, and we included data through 1974, or a biogeo­ chemical record of 11 years. Now our continuous, long-term biogeo­ chemical records cover more than 31 years, and there have been many changes. The most notable change, however, is that three of our coauthors on the original volume are now deceased. They are deeply missed in so many ways. In spite of the longer records, different trends, and new insights, we believe that the basic concepts and approaches we presented in 1977 represent the most valuable contribution of the original edition. They are still valid and useful, particularly for an introductory study of, or course in, biogeochemistry. Our goal in this revision is to preserve these fea­ tures, correct errors, and revise or eliminate misleading or ambiguous short-term data (11 years!), while maintaining approximately the original length and the modest cost.

Inhalt

1 Ecosystem Analysis.- Small Watershed Approach.- The Hubbard Brook Ecosystem.- Addendum.- 2 Hydrology.- The Water-Year.- Precipitation.- Streamflow and Evapotranspiration.- Deep Seepage.- Representativeness of the Hydrology of Hubbard Brook for Northern New England.- Addendum.- 3 Chemistry.- Precipitation Chemistry.- Stream-Water Chemistry.- Addendum.- 4 Input-Output Budgets.- Annual Variation.- Seasonal Variations.- Monthly Variations.- Addendum.- 5 Weathering.- Sources of Hydrogen Ion.- Estimates of Weathering Rates.- Weathering Mode.- Addendum.- 6 Nutrient Cycles.- The Calcium Cycle.- The Sulfur Cycle.- Nutrient Budget Relationships at Hubbard Brook.- Addendum.- 7 The Northern Hardwood Ecosystem at Hubbard Brook in Relation to Other Forest Ecosystems in the World.- 8 Summary Discussion and Conclusions.- Epilog.- Odyssey.- References.- Selected References for Further Reading About the Hubbard Brook Ecosystem Study.