Departmental Bulletin Paper 北海道東部のミズナラ造林地における土壌の炭素および窒素の蓄積様式 : 連続した0~40年生林分を用いた解析
Accumulation patterns of soil carbon and nitrogen in a Japanese oak (Quercus crispula) plantation in eastern Hokkaido : Analyses using continuous 0-40 years old stands

大津, 洋暁  ,  菱, 拓雄  ,  田代, 直明  ,  井上, 幸子  ,  長, 慶一郎  ,  緒方, 健人  ,  馬渕, 哲也  ,  榎木, 勉

96pp.1 - 15 , 2015-03-30 , 九州大学農学部附属演習林
This study assessed the effect of the change in forest structure including understory vegetation of Sasa nipponica on soil C and N accumulation from 0 to 40-yr Japanese oak (Quercus crispula) plantation chronosequence. The peak of understory biomass was at 7 years after afforestation. Biomass of the overstory species linearly increased, and the biomass of overstory species was more than that of understory species after 8-yr. According to leaf mass index change along with stand age, canopy closure was occurred about 12 years after afforestation. The ranges of temporal changes in both soil C and N accumulations increased from surface to deep soil layers. The changes in C and N accumulation of O layer were large during early stage of stand development, and C and N accumulations increased until 10 years and 20 years after afforestation, respectively. Overstory leaf mass positively correlated with C and N accumulations in O layer. Understory biomass negatively correlated with N accumulation in O layer and positively correlated with C/N ratio. The N accumulations both in mineral soil 0-4 and 4-8cm in depth were negatively correlated with fine root mass of S. nipponica. The results suggested that change in vegetation structure such as canopy closure by overstory and dynamics of understory biomass affected soil C and N accumulations.

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