The main reason is that the effectiveness of limestone is short-term, and the metal sulfide adsorbed on the carbonate is easy to desorb after long-term leaching and weathering, and is oxidized to produce acid again (Evangelou, 1995); in addition, as shown in the reaction formula (5) - (7), simulated rainfall may cause hydrolysis of various potential acidity to release H +, which reduces the treatment effect on acid soil.
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