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Temporal patterns of soil phosphorus release to runoff during a rainfall event as influenced by soil properties and its effects on estimating soil p losses

Wang, Y.T., Zhang, T.Q., Hu, Q.C., O'Halloran, I.P., Tan, C.S., Reid, K. (2011). Temporal patterns of soil phosphorus release to runoff during a rainfall event as influenced by soil properties and its effects on estimating soil p losses, 91(3), 339-347. http://dx.doi.org/10.4141/cjss09097

Abstract

The phosphorus (P) released in soil runoff during a rainfall event varies as labile P is depleted, and the dynamic pattern can be a function of soil P content and other soil properties. This study was conducted to determine the temporal pattern of runoff dissolved reactive P (DRP) concentration during a simulated rainfall event and the controlling soil properties. Soil samples were collected from six soil types across the province of Ontario, with 10 sites for each, to provide a wide range of soil test P (STP) levels. The instantaneous DRP concentration in surface runoff created during the rainfall event could be predicted by time t (min, since the onset of surface runoff) through a power function: DRP-at-b, where a and b are constants representing initial potential of soil P release to runoff as DRP at the onset of surface runoff and DRP decrease rate with time, respectively. The values of a and b for a given soil could be determined by DPSM3-2 (Mehlich-3 P/Mehlich-3 Al) using the following formulas: α=0.0824×e5.8556×DPSM3-2(r2=0.9704);andβ=1.228×(DPSM3-2)2+0.1865× DPSM3-2+0.1430(r2=0.6812) The description of the temporal pattern of runoff DRP concentration during a rainfall event with the constants estimated using DPSM3-2 can aid in the prediction of soil runoff DRP loss.

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