Separation of soil respiration into CO_2 emission sources using ^<13>C natural abundance in a deciduous broad-leaved forest in Japan(Environment)

概要

論文の詳細を見る
In determining the soil and ecosystem carbon balance, it is necessary to distinguish between autotrophic respiration and heterotrophic respiration. We attempted to measure the contribution of CO_2 emissions from plant roots (R_<RHI>), from soil organic matter (R_<SOM>), and from litter (R_L) to CO_2 emissions from the forest floor (soil respiration ; R_s) in a deciduous forest of oak (Quercus serrata Thunb.) and hornbeams (Carpinus laxiflora Sieb. et Zucc. Bl., Carpinus tschonoskii Maxim. and Carpinus japonica Bl.) on Andosols in Japan, using a ^<13>C natural abundance technique. The ^<13>C natural abundances of roots (δ_<RHI>), litter (δ_L) and SOM (δ_<SOM>) in the surface soil were -28.9, -30.1 and -24.3‰, respectively. This means that the differences between δ_<SOM> and δ_<RHI> are large enough to calculate the contributions of R_<RHI>, R_<SOM> and R_L to R_S based on the mass balance of the CO_2 isotope ratios. R_<RHI> and R_<SOM> had close relationships with soil temperature, and R_L was influenced by soil temperature and moisture. In summer, under high soil temperatures, R_<RHI> and R_<SOM> were the predominant sources of R_S and the proportion of R_<RHI> to R_<SOM> to R_L was 51: 44: 5. In winter, R_L was predominant and the proportion of R_<RHI> to R_<SOM> to R_L was 20: 11: 69. The estimated annual emissions of R_<RHI>, R_<SOM> and R_L were 1.45, 2.10 and 1.30 Mg C ha^<-1>, respectively ; thus, the proportion of R_<RHI> to R_<SOM> to R_L was 30: 43: 27 on a whole-year basis.
社団法人日本土壌肥料学会の論文

Separation of soil respiration into CO_2 emission sources using ^<13>C natural abundance in a deciduous broad-leaved forest in Japan(Environment)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク