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Atarashi-Andoh, Mariko; Koarashi, Jun; Liang, N.*; Takagi, Kentaro*; Kondo, Toshiaki*; Hirano, Takashi*; Teramoto, Munemasa*; Takagi, Masahiro*; Ishida, Sachinobu*; Ichii, Kazuhito*; et al.
no journal, ,
no abstracts in English
Nakayama, Masataka; Tateno, Ryunosuke*
no journal, ,
Root exudates, carbon compounds secreted from plant fine roots, enhance nutrient cycles within root surrounding soil (rhizosphere) by stimulating microbial activities and growth. However, there is a lack of knowledge about the effect of the differences in the chemical composition of root exudates and the diversity of root exudates on the nitrogen cycle within the rhizosphere. Here, we investigated the impact of the differences in root exudates on the nitrogen cycles and microbial community using artificial root exudates (ARE). We added ARE from the simulated fine root and changed their diversity from 1 to 3 per incubation system. Soil microbial gene abundances varied among ARE types and diversity, but the differences were not statistically significant. In addition, there was a non-significant effect of ARE on nitrogen cycling processes. These results indicated that the diversity and compositions of root exudates did not affect the microbial community and nitrogen cycle for at least a short time.
Abe, Yukiko; Nakayama, Masataka; Tange, Takeshi*; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
Soil is the largest carbon pool in terrestrial ecosystems, and forest soils in particular play an important role as a C reservoir in the global C cycle. Organic matter in the soil is released to the atmosphere as carbon dioxide through microbial decomposition (heterotrophic respiration). Decomposition of organic matter accumulated in the subsoil may contribute significantly to heterotrophic respiration, but it is not clear. Therefore, the objective of this study was to determine the heterotrophic respiration rate from the surface to the lower layers of forest soils with different parent materials. This presentation will report on the relationship between soil physicochemical and organic matter properties and heterotrophic respiration.