Dissolved Reactive Phosphorus trends at National River Water Quality Network sites, 1989-2007
Notes:
(1) A ‘meaningful’ trend is both statistically significant and environmentally meaningful, while a ‘significant’ trend is statistically significant but not necessarily environmentally meaningful (eg, the scale of the change could be very minor).
(2) An increase in dissolved reactive phosphorus is seen as a decline in water quality, while a decrease is seen as an improvement.
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