Original Article

Journal of Forest Research

, Volume 16, Issue 1, pp 35-45

Changes in carbon stock following soil scarification of non-wooded stands in Hokkaido, northern Japan

  • Keiichi AoyamaAffiliated withGraduate School of Environmental Science, Hokkaido University
  • , Toshiya YoshidaAffiliated withUryu Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido University Email author 
  • , Akane HaradaAffiliated withGraduate School of Environmental Science, Hokkaido University
  • , Mahoko NoguchiAffiliated withShikoku Research Center, Forestry and Forest Products Research Institute
  • , Hisashi MiyaAffiliated withGraduate School of Agriculture, Hokkaido University
  • , Hideaki ShibataAffiliated withNorthern Forestry and Development Office, Field Science Center for Northern Biosphere, Hokkaido University

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Abstract

To restore non-wooded stands dominated by dwarf bamboo species (Sasa kurilensis or S. senanensis) into forests, mechanical soil scarification has been applied in northern Japan since the 1960s. The treatment is followed both by natural regeneration and artificial planting. In this study, we quantified the total carbon stock (plants plus 0.3 m depth of soil) of these stands over 35-year age-sequences. The natural regeneration stands were gradually dominated by Betula ermanii. The carbon stock increased linearly to 215.1 ± 35.2 Mg C ha−1 for a 37-year-old stand formerly dominated by S. kurilensis, and 181.1 ± 29.8 Mg C ha−1 for a 34-year-old stand formerly dominated by S. senanensis. The latter was similar to that of a Picea glehnii plantation, formerly dominated by S. senanensis, with comparable stand age (160.3 ± 6.7 Mg C ha−1 for 35-year-old stands). Although the carbon stock in plants quickly offset the untreated level, that in the soil remained depressed even in the older stands. This resulted in small differences in carbon stock of these stands with untreated dwarf bamboo stands. We conclude that natural regeneration following scarification could be a prime option for carbon sink management in the region. However, we should take a long rotation period (i.e., >50 years) to ensure a carbon sink state. A potential of further improvements of the practice, including that reduce intensity of soil disturbance, was presented.

Keywords

Afforestation Carbon sink management Cool-temperate forest Dwarf bamboo Natural regeneration