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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

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We have discussed the topic of biotic regulation of outputs by the forested ecosystem in our volume, Pattern and Process in a Forested Ecosystem (Bormann and Likens 1979). In summary, we proposed a model of forest development (to be discussed more fully in Chapter IX) that envisages four phases of development: Reorganization, Aggradation, Transition and Steady State following the disturbance of the forest-ecosystem by, for example, clear cutting or hurricanes. The greatest regulation over ecosystem outputs occurs when the forest is in the Aggradation Phase.

In addition, studies of the dry deposition of sulfur in comparative studies between bulk and wet-only precipitation collectors at Hubbard Brook show that there is a strong seasonal aspect in the dry deposition of sulfur. Calculations based on these two approaches suggest that 60% of the annual dry deposition of sulfur occurs during the winter months of December through March. We emphasize that these calculations are preliminary and are based on relatively sparse data on atmospheric concentrations and on the assumption of uniform deposition'velocities throughout the seasons.

Inputs of hydrogen ion, NH4 + and N0 3- generally increased from 1964-65 to 1973-74, but have decreased or remained about the same since. B-tO), showing the influence of the amount of precipitation on long-term trends. Chemical deposition generally increases ..... 8 ..... B-S. Average annual volume-weighted concentrations in bulk precipitation and amount of precipitation during 1963 to 1980. Samples were collected in the south-facing Experimental Watersheds. 05. S ..... g. liter/ha). g. g. Eq) per unit area (kg/ha or Eq/ha) per week.

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