Organicmatter5%（W）,土壤三相组成（图）,第2章土壤有机质(soilorganicmatter,SOM),ConceptofSOM,土壤有机质是指存在于土壤中的所有含碳的有机物，包括各种动植物残体，微生物体及其分解和合成的各类有机物质。,Soilorganicmatter-non-livingcomponentswhichareaheterogeneousmixturecomposedlargelyofproductsresultingfrommicrobialandchemicaltransformationsoforganicdebris.Soilorganicmattercanexistindifferentmorphologicalpatterns,whicharethebasesoftheclassificationofsocalledformsandtypesofhumus.,2.1土壤有机质的来源、含量及其组成,微生物(microbe,microorganism)动物来源(fauna)植物来源(plant)工农业副产品(byproductfromindu
