Response of five Chinese forest soils to acidic inputs: batch experiment
Response of five Chinese forest soils to acidic inputs: batch experiment
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DOI：
10.1016/s0016-7061(98)00041-x
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发表时间：
1998-11-01
期刊：
影响因子：
6.1
通讯作者：
Seip, HM
中科院分区：
文献类型：
--
作者：
Bohan, L;Larssen, T;Seip, HM
受长期严重酸沉降影响，我国南方土壤面临酸化危险。本文介绍了从中国南方五个地区采集的五种森林土壤（每层两个层）的批量试验结果。主要目的是确定并比较这些森林土壤对酸沉降的反应。每个土壤样品用去离子水或由 H2SO4 和 HNO3 稀混合酸以及 CaSO4、MgSO4 和 NH4NO3 溶液组成的三种酸性提取剂之一提取 15 次。讨论了土壤提取物中离子浓度和 pH 值的趋势，以及主要土壤性质的变化，例如 pH 值、可交换碱阳离子、可交换铝、有效阳离子交换容量 (CECeff) 和碱饱和度 (BS)。除了交换性铝 (Al-ex) 之外，还用 CuCl2、焦磷酸盐和草酸盐溶液（分别为 Al-c、Al-p 和 Al-ox）提取土壤铝。考虑到土壤和土壤水，酸沉降对福建和南昌土壤的影响最大，其次是湖南和重庆土壤，而对贵阳土壤的影响可能不太严重。铝的释放（Al-rel，即提取物中的总量）与土壤水 pH 值以及铝库（Al-p 或 Al-ox）高度相关。对于铝动员（Al-mob，即铝释放量和可交换铝变化的总和），通过使用土壤 pH 值和 Al-ox 池获得了最佳拟合。土壤有机质似乎在铝释放和铝动员中发挥着重要作用。对于两种土壤（贵阳和南昌），结果与之前使用类似溶液进行柱实验的值非常吻合。 (C) 1998 Elsevier Science B.V. 保留所有权利。
Soils in southern China are in danger of being acidified due to the impact of long-term severe acid deposition. This paper presents the results of a batch experiment with five forest soils (two horizons from each) collected from five regions in southern China. The primary objective was to determine and compare the responses of these forest soils to acid deposition. Each soil sample was extracted 15 times with deionized water or one of three acidic extractants made of dilute mixed acids of H2SO4 and HNO3, and solutions of CaSO4, MgSO4 and NH4NO3. The trends in ion concentrations and pH in the soil extracts, and the changes in major soil properties such as pH, exchangeable base cations, exchangeable aluminium, effective cation exchange capacity (CECeff) and base saturation (BS) are discussed. In addition to exchangeable aluminium (Al-ex), soil Al was extracted with CuCl2, pyrophosphate, and oxalate solutions (Al-c, Al-p, and Al-ox, respectively). Considering both soil and soil water, the results indicate that acid deposition has the largest effects on the soils from Fujian and Nanchang, then followed by the soils from Hunan and Chongqing, while the effects on the Guiyang soil are probably less serious. The release of aluminium (Al-rel, i.e., the total amounts in extracts) was highly correlated to soil water pH and either of the aluminium pools, Al-p or Al-ox. For the aluminium mobilization (Al-mob, i.e., the sum of the aluminium release and the change in exchangeable aluminium) the best fit was obtained by using soil pH and the Al-ox pool. Soil organic matter seemed to play an important role in both aluminium release and aluminium mobilization. For two of the soils (Guiyang and Nanchang), the results were in excellent agreement with the values from previous column experiment with similar solutions. (C) 1998 Elsevier Science B.V. All rights reserved.