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Water 2017, 9(5), 315;

Effects of Precipitation and Topography on Total Phosphorus Loss from Purple Soil

Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China
Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, SK S4S 7H9, Canada
Author to whom correspondence should be addressed.
Academic Editors: Gordon Huang and Yurui Fan
Received: 7 April 2017 / Revised: 25 April 2017 / Accepted: 27 April 2017 / Published: 28 April 2017
(This article belongs to the Special Issue Modeling of Water Systems)
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The Sichuan Basin is the main agricultural production area of the upper reaches of the Yangtze River and is also an extremely important ecological area because it is rich in biodiversity and has complex and diverse landscape types. The dominant soil type, purple soil, is prone to rapid soil erosion and weathering processes because it is shallow and rich in phosphorus and other nutrients. Field experiments were conducted to reveal the effects of precipitation and topography characteristics on nonpoint source pollutants from purple soil. The results showed that total phosphorus (TP) load and TP concentration both increased with increasing rainfall amount, and there was an initial time of runoff and sediment yield before runoff generation. Moreover, the TP load generally increased with precipitation intensity as setting a coincident value of rainfall amount; however, the difference between TP load at 30 and 60 mm/h was minimal as was the difference between 90 and 120 mm/h. Similarly, TP concentration increased with increasing precipitation intensity. In terms of topographical conditions, TP load increased with increasing gradient, but began to decline when the gradient was about 20°, which indicates that 20° is the critical gradient for TP loss. There was a significant positive correlation between gradient and TP concentration when the gradient was <15°, whereas the increase in TP concentration slowed as the gradient increased. View Full-Text
Keywords: total phosphorus; precipitation; topography; purple soil; precipitation simulation; Sichuan Basin total phosphorus; precipitation; topography; purple soil; precipitation simulation; Sichuan Basin

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Ding, X.; Xue, Y.; Lin, M.; Liu, Y. Effects of Precipitation and Topography on Total Phosphorus Loss from Purple Soil. Water 2017, 9, 315.

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