Topic outline

  • Persistent organic matter

  • Persistent organic matter

    • The page of "Resistant organic matter and carbon cycle" was written by Prof. Yohei Yamashita of Faculty of Environmental Earth Science.

       Considering the main location of non-living organic matter on Earth, in terrestrial ecosystems soil organic matter is mentioned. You probably know that the dead bodies and excretions of plants, microorganisms, and animals make up soil organic matter. On the other hand, one of the locations of non-living organisms in the ocean is in marine sediments, and the other is in seawater. Abiotic organic matter in seawater is mostly present in the dissolved fraction (in the open ocean, more than 90% of abiotic matter in seawater is dissolved organic matter). It is not well known that the total amount of dissolved organic matter in the ocean is more than 200 times the amount of marine biomass, and most of the organic matter present in the ocean is abiotic organic matter.

      陸上植物land plant 大気中二酸化炭素atmospheric carbon dioxide 土壌有機物soil organic matter 植物プランクトンphytoplankton 溶存有機物dissolved organic matter 無機炭素inorganic carbon 海洋堆積物marine sediments


      Pg (petagram) is 1015g. GtC is also used in IPCC reports, etc.

    •  In "Dynamics of Marine Life Systems 3 Chain of Marine Organisms" (Kazuhiro Kogure [ed.] Tokai University Press), he describes the hypothesis of the generation of persistent organic matter in the ocean. I (Oki) will interpret it in my own way, add some interpretations, and explain. It is thought that there are several routes for generation of persistent organic matter. Just be aware that this is an active area of ​​research, so what I say here may not necessarily be universally accepted.

      細菌bacteria 易分解性Easily degradable 難分解性persistent 有機ガスorganic gas ガス化Gasification 光分解photolysis 単量体monomer アミノ酸amino acid 単糖類Monosaccharide フェノール類Phenols などetc. 腐植物質の形成Formation of humic substances 光吸収・蛍光特性のDOM 高分子High molecular 低分子small molecule 大Big 分子サイズmolecular size 小small