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Summary: Spatial and TemporalVariability of PhosphorusRetention in a Riparian Forest Soil
Jodi B. Lyons,* Josef H. G0rres, and Jos~ A. Amador
ABSTRACT
RiparianzonesremovePfromsurfacerunoffandcanactasfilters
of nonpointsource(NPS)Ppollutionfor surfacewaters.Riparian
forestsoils wereinvestigatedin springandfall fortheircapacityto
retainPO4~--P.Samples(300oneachdate)weretakenfroma soil
drainagecatenafrommoderatelywell (MWD),somewhatpoorly
(SPD),andpoorlydrained(PD)soil in MayandNovemberof
to examinespatialandtemporalvariabilityof Pretentionandits
relationshipto soil properties.TheequilibriumPconcentrationat
zerosorption(EPC0)wasdeterminedfor eachsamplingpoint(lower
EPC0,=higherPretentioncapacity).Mean(coefficientof variation,
CV)EPC0valueswere3.8 (0.49) mg-tin Mayandno Psorption
wasapparentin NovemberforSPDsoil, 1.0(1.34)and1.5(1.03)
P L-1in MayandNovember,respectivelyfor MWDsoil, and0.5
(1.87)and1.3(1.13)mg-~, respectively forPD soil. TheEPC0
wassignificantlyandpositivelycorrelatedto organicmatter(OM)
for all drainageclasses onbothdates.LowEPC0values--highP
retentioncapacity--inMWDandPDsoil correspondedwithhigh
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