Agricultural Sciences

Biogeochemistry of a Forested Ecosystem by Gene Likens, F.Herbert Bormann

By Gene Likens, F.Herbert Bormann

After we initially released Biogeochemistry of a Forested atmosphere in 1977, the Hubbard Brook atmosphere research (HBES) have been in lifestyles for 14 years, and we incorporated facts via 1974, or a biogeo­ chemical checklist of eleven years. Now our non-stop, long term biogeo­ chemical files disguise greater than 31 years, and there were many adjustments. the main awesome swap, notwithstanding, is that 3 of our coauthors at the unique quantity at the moment are deceased. they're deeply neglected in such a lot of methods. even with the longer documents, diverse tendencies, and new insights, we think that the elemental techniques and ways we awarded in 1977 signify the main invaluable contribution of the unique version. they're nonetheless legitimate and worthy, relatively for an introductory learn of, or direction in, biogeochemistry. Our objective during this revision is to maintain those fea­ tures, right blunders, and revise or do away with deceptive or ambiguous non permanent facts (11 years!), whereas conserving nearly the unique size and the modest fee.

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Dissolved carbon in precipita- 33 Precipitation chemistry tion represents an additional energy source for the ecosystem and may be of some ecological importance. Studies of these relationships are currently underway at Hubbard Brook. Origin of ions in precipitation Cations and anions in precipitation originate from a variety of sources, including oceanic spray, terrestrial dust, gaseous pollutants, and volcanic emissions. How ionic materials find their way into a precipitation collector is an important enigma.

Relationship among precipitation, streamflow, and evapotranspiration during the months of June through September for watershed 3 of the Hubbard Brook Experimental Forest during 1958-1974. Evapotranspiration (open circles) is determined as the difference between the amount of precipitation and streamflow for 1 June to 30 September. The solid line is fitted by eye. The dashed line represents evapotranspiration as computed from data on precipitation and air temperature using a United States Forest Service hydrologic model, which includes an estimate of the change in total storage of soil water.

This is in contrast to annual streamflow, which is highly correlated with the amount of precipitation (Figure 6). This suggests that on an annual basis evapotranspiration is fairly constant, that it has first call on precipitation, and that once evapotranspiration is satisfied the remainder of the precipitation goes to streamflow. In a general way this appears to be true , but a more detailed analysis suggests a more complex situation. Streamflow during the months of June through September has an exponential relationship to precipitation, starting slowly and rising after about 45 cm (Figure 7).

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