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Spatial and Temporal Variability of Phosphorus Retention in a Riparian Forest Soil
Author(s) -
Lyons Jodi B.,
Görres Josef H.,
Amador José A.
Publication year - 1998
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1998.00472425002700040025x
Subject(s) - riparian zone , soil water , surface runoff , hydrology (agriculture) , sorption , spatial variability , phosphorus , organic matter , environmental science , riparian forest , loam , drainage , zoology , chemistry , environmental chemistry , soil science , ecology , geology , statistics , geotechnical engineering , mathematics , organic chemistry , adsorption , habitat , biology
Riparian zones remove P from surface runoff and can act as filters of nonpoint source (NPS) P pollution for surface waters. Riparian forest soils were investigated in spring and fall for their capacity to retain PO 3− 4 ‐P. Samples (300 on each date) were taken from a soil drainage catena from moderately well (MWD), somewhat poorly (SPD), and poorly drained (PD) soil in May and November of 1995 to examine spatial and temporal variability of P retention and its relationship to soil properties. The equilibrium P concentration at zero sorption (EPC 0 ) was determined for each sampling point (lower EPC 0 , = higher P retention capacity). Mean (coefficient of variation, CV) EPC 0 values were 3.8 (0.49) mg P L −1 in May and no P sorption was apparent in November for SPD soil, 1.0 (1.34) and 1.5 (1.03) P L −1 in May and November, respectively for MWD soil, and 0.5 (1.87) and 1.3 (1.13) mg P L −1 , respectively for PD soil. The EPC 0 was significantly and positively correlated to organic matter (OM) for all drainage classes on both dates. Low EPC 0 values—high P retention capacity—in MWD and PD soil corresponded with high Fe ox and Al ox values. For SPD soil, high mean EPC 0 corresponded with low mean Fe ox and Al ox values. The relationship between EPC 0 and Fe ox and Al ox was described by a hyperbolic function for MWD and PD soil, but not for SPD soil. The EPC 0 did not exhibit spatial structure at the sampling scale used for any of the drainage classes, even though Fe ox , Al ox , and OM content showed spatial structure.