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Definitions (62)
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acid deposition
Deposition that is acidic.
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ACID PRECIPITATION
Precipitation that is acidic. Acid rain is a type of acid precipitation.
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adsorption
The accumulation of gases, liquids, or solutes on the surface of a solid or liquid. At the HBEF scientists often examine how different compounds in the soil (e.g., nitrate) adsorb, or attach, to soil particles.
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allochthonous
Food material reaching an aquatic community in the form of organic detritus.
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ammonification
This is the process in which organic forms of nitrogen (e.g., nitrogen present in dead plant material compounds) are converted to ammonium (NH4+) by decomposers (bacteria).
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anion
Negatively charged ions such as nitrate (NO3-) or chloride (Cl-).
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Anoxic
No oxygen present.
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Base-poor soils
Soils that have low levels of base cations such as magnesium, sodium, potassium, and calcium.
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Calcium
(in terms of HB research): Acid rain has caused the leaching of calcium, a natural component of HBEF soils very important to plant growth, from forest soils over the past several decades. In 1999 an experiment started in which calcium was added to an entire watershed in an effort to restore soil calcium pools to pre-acid rain levels and study the c [..]
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Catchments
An area from which all the drainage water passes into one stream or other body of water.
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