Changes in carbon stock following soil scarification of non-wooded stands in Hokkaido,northern Japan |
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| Authors: | Keiichi Aoyama Toshiya Yoshida Akane Harada Mahoko Noguchi Hisashi Miya Hideaki Shibata |
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| Institution: | (1) Graduate School of Environmental Science, Hokkaido University, Nayoro, Japan;(2) Uryu Experimental Forest, Field Science Center for Northern Biosphere, Hokkaido University, Moshiri, Horokanai, Hokkaido 074-0741, Japan;(3) Shikoku Research Center, Forestry and Forest Products Research Institute, Kochi, Japan;(4) Graduate School of Agriculture, Hokkaido University, Sapporo, Japan;(5) Northern Forestry and Development Office, Field Science Center for Northern Biosphere, Hokkaido University, Nayoro, Japan |
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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. |
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