Characteristics of carbon mineralization in disturbed and undisturbed incubations of forest soil

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  • TODA Hiroto
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.
  • SHIMADA Hiromasa
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.:(Present office)Depart. of Agric., For. and Fish., Mie Pref.
  • HAIBARA Kikuo
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.

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Other Title
  • 森林土壌の破壊・非破壊培養における炭素無機化特性
  • シンリン ドジョウ ノ ハカイ ヒハカイ バイヨウ ニ オケル タンソ ムキカ

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Abstract

The effect of disturbed incubation on the mineralization of soil carbon (C) in a forest soil was investigated. Soil samples from different plot (a lower slope cedar (Cryptomeria japonica D. DON) plot, a lower slope mixed cedar and cypress (Chamaecyparis obtusa ENDL) plot, a mid-slope cypress plot, an upper slope cypress plot and an upper slope deciduous broad-leaved plot) and soil depths were investigated to clarify the characteristics of C mineralization. The C mineralization process in the soils was modelled mathematically using a simple kinetic model, and three parameters (C mineralization potential (C_0), Rate constant of mineralization (k(25℃)) and Apparent activation energy (Ea)) were examined in relation to temperatures and soil properties. Disturbed incubation of soil from the middle and upper slope positions decreased the C_0 by 15-34% at 0-10cm depth and by 15-65% at 10-20cm depth. There were many fine roots in the plots where C_0 was decreased by disturbed incubation. This suggests that the amount of C and the microbial activity in the rhizosphere were reduced by removing the fine roots. However, disturbed incubation had no great effect on the relationships between C_0 and slope positions or depth. k(25℃) was higher in disturbed incubation in most soil samples because microbial activity and CO_2 diffusion were greater in disturbed soils. It was assumed that the removal of fine roots (C source) would increase Ea. However, except for the cedar plot, Ea was lower or similar level in disturbed than in undisturbed incubations. It was concluded that this was because the fine roots and other large organic matter had a lot of material that difficult to mineralize (e.g. Lignin) or which inhibits mineralization (e.g. Terpenoids and Polyphenols).

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