Forest management practices such as clearcutting risk increasing the leaching loss of cations and soil acidification by increasing nitrification and reducing plant uptake. To evaluate the effect of two forest management practices, clearcutting and stem girdling, on soil acidification, we quantified proton budgets by measuring ion fluxes associated with solute leaching and plant uptake in a Japanese cedar plantation in Wakayama, Japan. In the control and girdling plots, the dissociation of organic acids was a major proton-generating process that promoted cation leaching from the organic horizon. Plant uptake of mobilized cations was a dominant soil-acidifying process in the control plot, whereas litterfall from tree dieback and loss of plant uptake led to soil alkalization via cation inputs to the mineral soil in the girdling plot. In the clearcut plot, in addition to cation removal due to harvesting, nitrification was a major proton-generating process that increased aluminum (Al) leaching in the first year following clearcutting. However, proton consumption via net mineralization (loss) of soil organic matter (SOM) could neutralize the acidity generated by nitrification. Forest management practices stimulate both proton-generating and -consuming processes. Soils under cedar plantation are affected by biological acidification of surface soil by plant uptake in the rooting zone and net cation leaching by carbonic acid below the rooting zone (subsoil and bedrock), but organic matter and Al and Fe oxides accumulated in plantation could mitigate acidification induced by disturbances.

森林管理实践，例如清除风险，通过增加硝化作用和减少植物吸收来增加阳离子的淋失和土壤酸化。为了评估两种森林管理实践（砍伐和环剥）对土壤酸化的影响，我们通过测量日本和歌山日本雪松种植园中与溶质浸出和植物吸收相关的离子通量来量化质子预算。在对照和环剥地块中，有机酸的解离是促进阳离子从有机层中浸出的主要质子产生过程。在对照样地，植物吸收动员的阳离子是主要的土壤酸化过程，而树木枯死和植物吸收的损失导致土壤碱化，通过阳离子输入到环剥样地的矿质土壤中。在砍伐地块中，除了因收获而去除阳离子外，硝化作用是一个主要的质子产生过程，在砍伐后的第一年增加了铝 (Al) 的浸出。然而，通过土壤有机质 (SOM) 的净矿化（损失）消耗质子可以中和硝化作用产生的酸度。森林管理实践刺激质子产生和消耗过程。雪松种植园的土壤受到生根区植物吸收对表层土壤的生物酸化和生根区以下（底土和基岩）碳酸净阳离子淋失的影响，但种植园中积累的有机质和铝和铁氧化物可以缓解酸化干扰引起的。硝化作用是一个主要的质子产生过程，在砍伐后的第一年增加了铝 (Al) 的浸出。然而，通过土壤有机质 (SOM) 的净矿化（损失）消耗质子可以中和硝化作用产生的酸度。森林管理实践刺激质子产生和消耗过程。雪松种植园的土壤受到生根区植物吸收对表层土壤的生物酸化和生根区以下（底土和基岩）碳酸净阳离子淋失的影响，但种植园中积累的有机质和铝和铁氧化物可以缓解酸化干扰引起的。硝化作用是一个主要的质子产生过程，在砍伐后的第一年增加了铝 (Al) 的浸出。然而，通过土壤有机质 (SOM) 的净矿化（损失）消耗质子可以中和硝化作用产生的酸度。森林管理实践刺激质子产生和消耗过程。雪松种植园的土壤受到生根区植物吸收对表层土壤的生物酸化和生根区以下（底土和基岩）碳酸净阳离子淋失的影响，但种植园中积累的有机质和铝和铁氧化物可以缓解酸化干扰引起的。通过土壤有机质 (SOM) 的净矿化（损失）消耗质子可以中和硝化作用产生的酸度。森林管理实践刺激质子产生和消耗过程。雪松种植园的土壤受到生根区植物吸收对表层土壤的生物酸化和生根区以下（底土和基岩）碳酸净阳离子淋失的影响，但种植园中积累的有机质和铝和铁氧化物可以缓解酸化干扰引起的。通过土壤有机质 (SOM) 的净矿化（损失）消耗质子可以中和硝化作用产生的酸度。森林管理实践刺激质子产生和消耗过程。雪松种植园的土壤受到生根区植物吸收对表层土壤的生物酸化和生根区以下（底土和基岩）碳酸净阳离子淋失的影响，但种植园中积累的有机质和铝和铁氧化物可以缓解酸化干扰引起的。