Nkana J C Voundi, Demeyer A, Verloo M G
Institut für Bodenkunde, Universität Bonn, Germany.
Bioresour Technol. 2002 Dec;85(3):323-5. doi: 10.1016/s0960-8524(02)00140-2.
The objective of this study was to determine the effect of wood ash application on soil solution composition of three tropical acid soils. Calcium carbonate was used as a reference amendment. Amended soils and control were incubated for 60 days. To assess soluble nutrients, saturation extracts were analysed at 15 days intervals. Wood ash application affects the soil solution chemistry in two ways, as a liming agent and as a supplier of nutrients. As a liming agent, wood ash application induced increases in soil solution pH, Ca, Mg, inorganic C, SO4 and DOC. As a supplier of elements, the increase in the soil solution pH was partly due to ligand exchange between wood ash SO4 and OH- ions. Large increases in concentrations of inorganic C, SO4, Ca and Mg with wood ash relative to lime and especially increases in K reflected the supply of these elements by wood ash. Wood ash application could represent increased availability of nutrients for the plant. However, large concentrations of basic cations, SO4 and NO3 obtained with higher application rates could be a concern because of potential solute transport to surface waters and groundwater. Wood ash must be applied at reasonable rates to avoid any risk for the environment.
本研究的目的是确定施用木灰对三种热带酸性土壤土壤溶液成分的影响。使用碳酸钙作为参考改良剂。对改良土壤和对照进行了60天的培养。为了评估可溶性养分，每隔15天分析一次饱和浸出液。施用木灰以两种方式影响土壤溶液化学，作为一种石灰改良剂和作为养分的供应者。作为石灰改良剂，施用木灰会导致土壤溶液pH值、钙、镁、无机碳、硫酸根和溶解性有机碳增加。作为元素的供应者，土壤溶液pH值的升高部分归因于木灰中的硫酸根与氢氧根离子之间的配体交换。与石灰相比，木灰使无机碳、硫酸根、钙和镁的浓度大幅增加，尤其是钾的增加反映了木灰对这些元素的供应。施用木灰可能意味着植物可利用养分的增加。然而，较高施用量下获得的大量碱性阳离子、硫酸根和硝酸根可能令人担忧，因为存在潜在的溶质向地表水和地下水迁移的风险。必须以合理的施用量施用木灰，以避免对环境造成任何风险。
