Leaf litter ash alkalinity and neutralisation of soil acidity
Leaf litter ash alkalinity and neutralisation of soil acidity
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DOI：
10.1007/bf00009340
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发表时间：
1996-02-01
期刊：
影响因子：
4.9
通讯作者：
Randall, PJ
中科院分区：
文献类型：
--
作者：
Noble, AD;Zenneck, I;Randall, PJ
土壤酸化是限制全世界农业生产系统可持续性的一个主要因素。浸灰在经济上并不总是可行的，因此需要替代方法或补充改良方法。从几个树种收集的落叶被检查灰碱度（作为有机阴离子含量的估计）和改善酸性土壤的能力。通过灰分滴定测量的灰分碱度和通过计算获得的过量阳离子值作为阳离子和阴离子含量之间的差异进行了关联。用后一种方法得到的数值范围从苦楝（白色雪松）的247 cmol（c）kg（-1）到球叶桉（白色树皮）的36 cmol（c）kg（-1）。灰碱度与凋落物中钙含量呈显著的线性相关。当添加到酸性土壤（pH 4.04，在0.01 M氯化钙中测量）和孵育8周，落叶提高pH值。物种差异显着与苦楝具有最大的影响。pH值的增加与添加的灰分碱度（有机阴离子）的量成比例，表示为碳酸钙当量。铝的交换复合物的水平降低处理落叶通过直接沉淀的固相和苦楝凋落物再次是最有效的。也有间接的证据表明，有机铝复合物影响的单体铝的浓度在土壤中处理的落叶枫香styraciflua（枫香），栎（英国橡树）和辐射松（辐射松）。
Soil acidification is a major factor limiting the sustainability of agricultural production systems throughout the world. Liming may not always be economically possible and therefore alternative methods or complementary methods of amelioration are required. Leaf litter collected from several tree species was examined for ash alkalinity (as an estimate of organic anion content) and ability to ameliorate an acid soil. Ash alkalinity measured by titration of the ash and excess cation values obtained by calculation as the difference between cation and anion content were correlated. Values obtained by the latter method ranged from 247 cmol(c) kg(-1) for Melia azedarach (white cedar) to 36 cmol(c) kg(-1) for Eucalyptus globoidea (white stringybark). There was a significant linear correlation between ash alkalinity and the Ca concentration in the litter. When added to an acid soil (pH 4.04 measured in 0.01 M calcium chloride) and incubated for 8 weeks, leaf litter raised the pH. Species differed markedly with Melia azedarach having the greatest effect. The increase in pH was proportional to the quantity of ash alkalinity (organic anions) added, expressed as calcium carbonate equivalents. Aluminium levels on the exchange complex were lowered by treatment with leaf litter through direct precipitation of a solid phase and again Melia azedarach litter was most effective. There was also indirect evidence of organo-Al complexes affecting the concentration of monomeric Al in soil treated with litter from Liquidambar styraciflua (liquidambar), Quercus robur (English oak) and Pinus radiata (radiata pine).