Notice of RetractionElement Migration and Nutrition Loss of Epikarst Spring during Rainfall at Nongla, Guangxi, SW China: Observations and Ponder

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Variations of hydrochemistry during rainfall were monitored at an epikarst spring at Nongla, Guangxi, SW China. In order to research the element migration and nutrition loss during rainfall, rainfall, water level and the concentrations of K⁺, NO₃ and Ca²⁺ of Landiantang spring were measured in intervals of 15 minutes for periods of 3 days. The measurements of Landiantang spring showed obvious variations in the chemical composition of the water respect to the storm event. During the rainfall, due to an afflux of rain to the spring, the water level, the concentrations of K⁺ and NO₃ almost appeared the synchronous variation with the quantity of rainfall. On one hand, K⁺ and NO₃ stands for the fertile index of soil, whose losing would increase water and soil erosion at karst area; on the other hand, NO₃ can also be as the contaminative condition of water quality. However, the concentrations of Ca²⁺ in Landiantang spring showed the reverse result comparing with the above ionic outcomes. It is the first time anywhere that the element migration and nutrition loss during rainfall has been monitored. According to the local condition, the above phenomena not only can provide new viewpoint about the increasingly deteriorating rocky desertification, but also can explain the cause of the restricted growth of plant.