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[1]XIONG Bailian,ZHANG Jinzhong,PENG Tao,et al.Study on the Losses of Base Cations, Silicon, Aluminum and Iron in Karst Red Soil Along With Runoff[J].Research of Soil and Water Conservation,2018,25(03):68-74.

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Study on the Losses of Base Cations, Silicon, Aluminum and Iron in Karst Red Soil Along With Runoff

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 03 Page number: 68-74 Column: Public date: 2018-04-10

Title:: Study on the Losses of Base Cations, Silicon, Aluminum and Iron in Karst Red Soil Along With Runoff

Author(s):: XIONG Bailian^1,2, ZHANG Jinzhong³, PENG Tao^4,5, SONG Xianwei^2,3; 1. College of Resources and Environment, Zunyi Normal University, Zunyi, Guizhou 563006, China;
2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
3. College of Resources and Environment, Southwest University, Chongqing 400715, China

Keywords:: karst; red soil; simulated rainfall; base cations; silicon; critical alkalinity leaching

CLC:: S157.1

DOI:: -

Abstract:: The loss characteristics of base cations, silicon, aluminum, iron and alkalinity in sloping land of Karst red soil in central Guizhou along with runoff were studied by using simulated rainfall experiments, and the environmental effects were analyzed. The results showed that the total loss load of seven inorganic constituents in red soil appeared the decreasing order:Ca²⁺ > Mg²⁺ > K⁺ > SiO₂ > Na⁺ > Fe > Al along with runoff. Among them, the losses of Ca²⁺, Mg²⁺, K⁺ and SiO₂ were significant, whereas the loss amounts of Fe and Al were very little. When the rainfall intensity was 45 mm/h, the surface runoff began to appear on the sloping land, and the mainly lost substances to surface runoff were K⁺ and Na⁺, which accounted for 90.91% of the total lost amount of seven inorganic constituents. When the rainfall intensity was 70 mm/h, the surface runoff flow exceeded the interflow, and the mainly lost substances to surface runoff were Ca²⁺, Mg²⁺, which accounted for 53.78% of the total lost amount of seven inorganic constituents. The substance composition in the interflow was little affected by rainfall intensity, and was dominated by K⁺. The losses of Ca²⁺, Mg²⁺, K⁺, SiO₂ and Fe were mainly through surface runoff, and the single-variable linear regression equation can be used to predict the surface loss loads of Ca²⁺, Mg²⁺ and SiO₂ under various rainfall intensities. The leaching amount of red soil alkalinity increased with the increase of rainfall intensity, but did not exceed the critical alkalinity leaching of red soil, which may not cause soil acidification in karst red soil.

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