By Gene Likens, F.Herbert Bormann
After we initially released Biogeochemistry of a Forested environment in 1977, the Hubbard Brook environment research (HBES) have been in lifestyles for 14 years, and we integrated info via 1974, or a biogeo chemical checklist of eleven years. Now our non-stop, long term biogeo chemical documents hide greater than 31 years, and there were many adjustments. the main impressive switch, although, is that 3 of our coauthors at the unique quantity at the moment are deceased. they're deeply overlooked in such a lot of methods. despite the longer files, various tendencies, and new insights, we think that the elemental recommendations and ways we awarded in 1977 symbolize the main useful contribution of the unique version. they're nonetheless legitimate and invaluable, rather for an introductory research of, or direction in, biogeochemistry. Our objective during this revision is to maintain those fea tures, right mistakes, and revise or get rid of deceptive or ambiguous momentary facts (11 years!), whereas preserving nearly the unique size and the modest price.
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Additional info for Biogeochemistry of a Forested Ecosystem
1972). 95. 0. 6 (Barrett and Brodin, 1955). In other words, the precipitation at Hubbard Brook has a hydrogen ion concentration 50-500 times greater than expected. , 1972). The occurrence of acid precipitation at Hubbard Brook, which is > 100 km distant from any large urban-industrial area, emphasizes that one of the major ways humans can influence natural ecosystems is through pollution of the atmosphere and that these effects are not limited to areas adjacent to sources of pollution. Acid precipitation apparently has been falling on much of the eastern United States since at least the early 1950s (Cogbill and Likens, 1974; 36 3.
During the summer months streamflow is very low, particularly during August and September (Figures 5 and 6). During this period water loss from the ecosystem occurs primarily through evapotranspiration. A secondary, minor peak in streamflow occurs in November and December when transpiration has virtually ceased after the loss of the deciduous leaves, and with somewhat greater autumn rainfall. At that time soil water deficits are eliminated and most of the rain moves through the soil and into the streams.
1976b). The increased annual input of hydrogen ion is partially explained by the "increase" in the amount of annual precipitation during the lO-yr period (Table 6); that is, the early years of the decade (1963-1965) were drought years and the last year (1973-1974) was extremely wet (Figure 4). However, close examination of data for individual years shows that factors other than increased amount of precipitation are important 6. Dependence of Annual Precipitation Input on Sequential Years for the Hubbard Brook Experimental Forest.