Researches on dissolved organic matters (DOMs) have been increasing in water and soil studies since the concept of DOM was proposed in 1970's. Although most former researchers considered that humic substances might substitute soil organic matters in liquid phase, more and more later studies made sure that DOMs, which were water extracted, could represent soil organic matters in liquid phase more properly than humic substances. Results of IR, NMR, RPLC and other spectrum analyses revealed that there were gre...