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首页> 外文期刊>Forest Ecology and Management >Soil changes induced by Acacia mangium plantation establishment: Comparison with secondary forest and Imperata cylindrica grassland soils in South Sumatra, Indonesia
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Soil changes induced by Acacia mangium plantation establishment: Comparison with secondary forest and Imperata cylindrica grassland soils in South Sumatra, Indonesia

机译：马占相思人工林建立引起的土壤变化：与印度尼西亚南苏门答腊的次生林和白茅草草原土壤比较

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Acacia plantation establishment might cause soil acidification in strongly weathered soils in the wet tropics because the base cations in the soil are translocated rapidly to plant biomass during Acacia growth. We examined whether soils under an Acacia plantation were acidified, as well as the factors causing soil acidification. We compared soils from 10 stands of 8-year-old Acacia mangium plantations with soils from 10 secondary forests and eight Imperata cylindrica grasslands, which were transformed into Acacia plantations. Soil samples were collected every 5-30cm in depth, and pH and related soil properties were analyzed. Soil pH was significantly lower in Acacia plantations and secondary forests than in Imperata grasslands at every soil depth. The difference was about 1.0 pH unit at 0-5cm and 0.5 pH unit at 25-30cm. A significant positive correlation between pH and base saturation at 0-20cm depth indicated that the low pH under forest vegetation was associated with exchangeable cation status. Using analysis of covariance (ANCOVA), with clay content as the covariate, exchangeable Ca (Ex-Ca) and Mg (Ex-Mg) stocks were significantly lower in forested areas than in Imperata grasslands at any clay content which was strongly related to exchangeable cation stock. The adjusted average Ex-Ca stock calculated by ANCOVA was 249kgha-p# in Acacia plantations, 200kgha-p# in secondary forests, and 756kgha-p# in Imperata grasslands at 0-30cm. Based on a comparison of estimated nutrient stocks in biomass and soil among the vegetation types, the translocation of base cations from soil to plant biomass might cause a decrease in exchangeable cations and soil acidification in Acacia plantations.
机译：相思树人工林的建立可能会在湿热带强风化的土壤中引起土壤酸化，因为在相思树生长期间，土壤中的碱性阳离子会迅速转移到植物生物量中。我们检查了相思人工林下的土壤是否被酸化，以及引起土壤酸化的因素。我们将10个8年生的相思木人工林的林分土壤与10个次生林和8个Imperata cylindrica草原的土壤进行了比较，这些草地被转化为相思木人工林。每5-30cm深度收集一次土壤样品，并分析pH值和相关的土壤特性。在每个土壤深度下，相思人工林和次生林的土壤pH均显着低于Imperata草原。差异在0-5cm时约为1.0 pH单位，在25-30cm时约为0.5 pH单位。 pH和0-20cm深度的碱饱和度之间存在显着的正相关关系，表明森林植被下的低pH与可交换阳离子状态有关。使用协方差分析（ANCOVA），以粘土含量为协变量，在任何与可交换性密切相关的粘土含量下，林区的可交换Ca（Ex-Ca）和Mg（Ex-Mg）储量均显着低于Imperata草地。阳离子库存。在0-30厘米处，ANCOVA计算得出的经调整的平均Ex-Ca储量在相思树人工林中为249kgha-p＃，在次生林中为200kgha-p＃，在Imperata草原中为756kgha-p＃。根据对植被类型之间生物量和土壤中估计的养分储量的比较，基础阳离子从土壤向植物生物量的迁移可能导致相思树人工林中可交换阳离子的减少和土壤酸化。

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