摘要
Dear Editor,Johannes Lehmann and Markus Kleber,in a controversial paper entitled"The contentious nature of soil organic matter"(Lehmann and Kleber,2015),suggested the abandonment of the term"humus"and other associated terms such as"humic","humir","humified","humification".The first reason they cited was that these labels are only instrumental in outdated soil analytical methods,which are based on alkaline extraction of soil organic matter(SOM).
