생물환경연구실

논문 초록 (Abstract)

The objectives of the study were to (i) investigate whether short term mineralization varies to a greater extent by charring organic matter (OM) or by exposure to different mineral surfaces, (ii) examine the effect of clay mineralogy on mineralization of either charred or uncharred OM and (iii) quantify these differences in mineralizat ion in the context of C evolution during charring. Mineralization of di fferent combinations of OM types (corn stover, cellulose, glucose, ligni n and arginine)or their corresponding pyrogenic organic matter (PyOM) with minerals (quartz, corundum, goethite, kaolinite and kaolinite mi xed with goethite) were assessed in incubation experiments at 30 deg rees C for 196 days. All PyOM materials showed lower mineralization ext ent (3.8-7.5% of initial C) than uncharred OM (7.6-89% of initial C) . Charring decreased mineralization to a greater extent (by 4.7-95 %) than differences in the minerals (by 3.7-70%). The relative standard deviation of C mineralization of individual charred OM material s caused by differences in mineralogy was smaller (8.7-16%) than that of uncharred OM (8.7-65%). For the ratio of C remaining after both mineralization and charring to mineralization of uncharred biom ass, the relative standard deviation was higher for different OM types ( 51-84%) than mineral types (1.1-47%), suggesting thatmineralogy was le ss important than OM properties. Therefore, the importance of mine ralogy was lower for charred than uncharred OM and the type of PyOM mo re strongly controlled mineralization than the type of mineral dur ing the initial decomposition process. (C) 2016 Elsevier Ltd. All right s reserved.