Nitrogen and Carbon Mineralization Characteristics of Different Decomposition Stages in Forest Floor of Some Tree Species

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  • Oyanagi Nobuhiro
    United Grad. Sch. Agric. Sci., Tokyo Univ. Agric. Technol
  • Chihara Mayu
    Fac. Agric., Tokyo Univ. Agric. Technol:(Present address)Yamanashi Prefect
  • Haibara Kikuo
    United Grad. Sch. Agric. Sci., Tokyo Univ. Agric. Technol
  • Toda Hiroto
    United Grad. Sch. Agric. Sci., Tokyo Univ. Agric. Technol

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Other Title
  • 分解程度の異なる樹種別リターの炭素および窒素無機化特性
  • ブンカイ テイド ノ コトナル ジュ シュベツ リター ノ タンソ オヨビ チッソ ムキカ トクセイ

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Abstract

Five experimental plots were set up in forest dominated by keyaki (Zelkova serrata), mizunara (Quercus mongolica var. grosseserrata), sugi (Cryptomeria japonica), hinoki (Chmaecyparis obutsa), and akamatsu (Pinusdensiflora) tree species. Forest floor samples were divided into L-F_1, F_2, F_3 and HA classes depending on the decomposition stages. Chemical properties and microbial biomass of carbon and nitrogen (MBC and MBN) in each class and mineral soil at the depth of 0-5 cm (A(0-5)) were measured. Mineralized carbon (C) and nitrogen (N) content of them for a 30-d incubation period at 25℃ were investigated. From these results, we discussed the relationships among them and the role of microbes in C and N mineralization in different decomposition stages in forest floor. 1) The order of total N concentration in forest floor was keyaki>mizunara>sugi>hinoki>akamatsu. It showed the same tendency as in litterfall. 2) Water soluble organic C (WSOC) concentration was the highest in L-F_1 class, and in keyaki and mizunara, it was three times as high as that of other three plots. It sharply decreased as decomposition of litter advanced. 3) In every plot, MBC and MBN concentrations were higher in F_2 and F_2 classes than in HA class and A(0-5). 4) The amounts of mineralized C were the greatest in L-F_1, F_2 or F_3 classes, with the ranking differing from plot to plot. The relationships between WSOC and mineralized C had a strong positive correlation in HA class and A(0-5). 5) The amounts of mineralized N were the greatest in F_3, HA classes or A(0-5) in every plot. In the mizunara plot, the nitrification rate was lower than in other plots. The net N mineralization in keyaki and sugi plots of moderately moist soil started under a higher C/N ratio than in other plots with dry soil. 6) Histerisis was shown, in which the increase or decrease of MBN concentration with the advancement of decomposition stage of litter preceded the increase or decrease of total N concentration and the amount of mineralized N.

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