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| Phosphorus movement characteristics of typical soils in the upper reaches of the Minjiang River, China |
| Received:December 30, 2017 |
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| KeyWord:Minjiang River;soil phosphorus;isothermal adsorption;phosphorus movement |
| Author Name | Affiliation | E-mail | | XU Guang-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Shi-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | rsz01@163.com | | ZHONG Qin-mei | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | WANG Gui-yin | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| In recent years, there has been an increasing interest in the non-point source pollution caused by the movement of soil phosphorus(P). The fractions and fixation capacities of soil phosphorus of four kinds of typical soils, including cinnamon soil, yellow-brown earth, dark-brown earth, and subalpine meadow soil, were assessed in this study to explore the characteristics of P movement. The results showed that the concentrations of H2O-P and NaHCO3-P were 3.39~10.91 mg·kg-1 and 5.70~51.97 mg·kg-1, respectively. P was easily lost by runoff in the process of soil erosion. HCl-P was the main fraction in the cinnamon soil and yellow-brown earth while NaOH-P had the largest share in dark-brown earth and subalpine meadow soil, and correspondingly the percentages of total P in these P fractions were 71.36%, 24.75%, 62.16% and 53.04%, respectively. Therefore, NaOH-P and HCl-P in these soils had high P-release potentials. The maximum sorption capacity, maximum buffer capacity, and P sorption index of soil P demonstrated that the risks of P movement from cinnamon soil and yellow-brown earth to the liquid phase were higher than those from dark-brown earth and subalpine meadow soil. The equilibrium P concentrations at zero sorption of soil P in the four soils ranged between 19.44 mg·L-1 and 24.08 mg·L-1, which is larger than 0.35 mg·L-1 for eutrophication. In summary, the soils in the Minjiang River have a higher risk of P movement. |
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