Lumping or Splitting:Holistic or Fractionation Approaches to Studies of Humic Substances
Some scientists (the ‘Lumpers),argue that soils,and especially soil organic matter should be studied in its entirety,others (the ‘Splitters) choose to fractionate and study the component species or molecular entities.Though it is true that the agricultural and environmental functions of soils involve the holistic assembly of its components many of the specific reactions and interactions involve components,both organic and mineral,that may be only a small fraction of the total assembly.In order to understand how the different species react and interact it is therefore necessary to have an awareness of the surface properties of the species and of aspects of their compositions and structures.This is especially true of the organic components,and it is therefore necessary to study their abundances,properties,and interactions with other soil components.The present study shows how the compositions of fractions of humic extracts from two soils and from their drainage waters differ as the result of management practises.One soil is in long term grassland and the other is in long term cultivation.Two humic isolation procedures were used; 1) the procedure for the isolation of the IHSS soil standards,and (2) a modification of the resin procedure introduced by Malcolm and MacCarthy (1992).
Soil extraction Soil organic matter Fractionation of soil organic extracts Humic acids Fulvic acids
Michael H.B.Hayes Roger S.Swift
Chemical and Environmental Sciences,University of Limerick,Ireland Queensland Alliance for Agriculture and Food Innovation,the University of Queensland,Australia
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
31-33
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）