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By J.O. Reuss, D.W. Johnson

The majority of this publication used to be written in 1983-84 whereas the senior writer used to be a traveling Scientist at Oak Ridge nationwide Laboratory (ORNL) in Oak Ridge, Tennessee. We think that the method of the matter of acid deposition results on soils and waters built in this collaboration comprises ele­ ments which are considerably assorted from such a lot past paintings during this region. a few of the fabric and the software program utilized in the advance of those innovations stem from prior person efforts of the authors. notwithstanding, what we think to be the extra major techniques about the approaches during which alkalinity could be built in acid soil recommendations, and in which acid deposition could contrib­ ute to the lack of this alkalinity, have been the results of this collaboration. the final word usefulness of those ideas in realizing and working with a number of features of the issues linked to acid deposition can't be accurately gauged today. they have to first stand up to checks of con­ sistency with to be had remark, and of direct experimentation. it truly is our wish that dissemination via this publication will facilitate this strategy in the medical group. The authors desire to thank the management of the Environmental technological know-how department at ORNL, and the varsity of Agricultural Sciences at Colorado kingdom college for his or her aid in arranging this collaboration. We additionally desire to convey our appreciation for the monetary help supplied through EPA. own thank you are because of Dr.

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Thus, there is a net cumulative H+ production (deficit) of -1 at this point. If the NH4 + is taken up by a plant or a microorganism, an H+ is released in the uptake process, so that the net cumulative H+ production is zero. , 1 mole of HN0 3 is produced for each mole of NH3 that is transformed to N0 3 -). The fate of any N0 3 - formed is of crucial importance in determining the effect of the nitrogen cycle on soil acidification. If N0 3 - is taken up by plants, OH- is released, neutralizing H+ and the net cumulative H+ production is again zero.

This pH depression is known as the "salt effect" and is not the result of the acidity of the input solution. ----- _.... 5. Soil solution pH as a function of percentage of calcium saturation at 25 and 250 JLeq SOi- IL as calculated by the chemical equilibrium model. In order to satisfy the CO 2-HC03 - equilibrium as shown in Eq. (2-1), the increase in H+ resulting from increased S042- must be accompanied by a decrease in HC03 -. This has the effect of reducing the bicarbonate alkalinity of the water that percolates through the soil, which in turn can have important consequences on the quality of surface waters, a situation that will be considered in more detail in Chap.

This has the effect of reducing the bicarbonate alkalinity of the water that percolates through the soil, which in turn can have important consequences on the quality of surface waters, a situation that will be considered in more detail in Chap. 7. The HC0 3- concentrations are also highly sensitive to the CO2 partial pressure in the soil. The effect of increased CO2 is to increase HC0 3-, particularly at high base saturation. The slopes of the HC03- lines in Fig. 4a and c are determined largely by the CO 2 partial pressure in the soil and can be expected to vary markedly from site to site and with time at a particular site.

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