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1 June 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
Y. T. Wang, T. Q. Zhang, Q. C. Hu, I. P. O'Halloran, C. S. Tan, K. Reid
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Abstract

Wang, Y. T., Zhang, T. Q., Hu, Q. C., O'Halloran, I. P., Tan, C. S. and 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. Can. J. Soil Sci. 91: 339-347. 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, where a and ß 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 ß for a given soil could be determined by DPSM3-2 (Mehlich-3 P/Mehlich-3 Al) using the following formulas:

cjss09097eq1.gif

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.

Y. T. Wang, T. Q. Zhang, Q. C. Hu, I. P. O'Halloran, C. S. Tan, and K. Reid "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," Canadian Journal of Soil Science 91(3), 339-347, (1 June 2011). https://doi.org/10.1139/CJSS09097
Received: 22 October 2009; Accepted: 1 May 2010; Published: 1 June 2011