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Affiliation |
IWATE University Faculty of Agriculture Department of Forest Science |
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Position |
Assistant professor |
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Year of Birth |
1990 |
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Mail Address |
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YAMAZAKI Haruka
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Graduating School 【 display / non-display 】
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2009.04-2013.03
Iwate University Faculty of Agriculture Graduated
Graduate School 【 display / non-display 】
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2015.04-2019.09
Hokkaido University Graduate School, Division of Environmental Science Doctor's Course Completed
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2013.04-2015.03
Hokkaido University Graduate School, Division of Environmental Science Master's Course Completed
Campus Career 【 display / non-display 】
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2020.10-Now
IWATE University Faculty of Agriculture Department of Forest Science Assistant Professor [Duty]
External Career 【 display / non-display 】
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2019.10-2020.09
Part-Time Researcher for University or Other Academic Organization
Course Subject 【 display / non-display 】
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2021
Biostatistics
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2021
Forest Measurement
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2021
Global Forestry
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2021
Introduction to Forestry
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2022
Graduation Research
Published Papers 【 display / non-display 】
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Scarification with surface soil replacement can promote understory reinitiation as well as the growth of a secondary birch stand
Toshiya Yoshida, Haruka Yamazaki, Toshizumi Miyam
Journal of Forest Research ( Taylor and Francis Ltd. ) 2022.07 [Refereed]
Bulletin of University, Institute, etc. Multiple authorship
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Takashi Kunisaki,Haruka Yamazaki
103 ( 4 ) 285 - 290 2021.08 [Refereed]
Academic Journal Multiple authorship
The stand growth process of an overcrowded old-growth
plantation of Japanese Cedar (Cryptomeria japonica D. Don) was investigated for 41 years, beginning when the stand was 134 years old, in the slope and flat site. In the slope site, since very weak cutting of about 10% in number ratio was carried out several times, overcrowding
condition could not be eliminated and mortality continued. However, as the trees were continuously cut down, the degree of crowding gradually improved and DBH growth increased, average height: DBH ratio decreased to less than 70, and net increment in stand volume reached more than 10 m3/ha/year. In the flat site, the low thinning of 22% in number ratio was carried out, when the stand was 146 years old, and overcrowding condition was eliminated and mortality stopped. As DBH growth increased, average height: DBH ratio decreased to less
than 70 and net increment in stand volume increased to around 20 m3/ha/year. It was confirmed that since the tree height growth continues at first site class, the net stand volume increment would be around 20 m3/ha/year for about 20 years, if lower thinning is conducted to exceed 15% of the relative spacing index. -
Early establishment of spruce (Picea glehnii [Fr. Schm.] Masters) seedlings on disturbed soil with the aim of assisted natural regeneration
Nanami SUZUKI, Toshiya YOSHIDA, Toshizumi MIYAMOTO, Karibu FUKUZAWA, Shingo TANIGUCHI, Haruka YAMAZAKI
Scandinavian Journal of Forest Research ( Nordic Forest Research ) 2021.03 [Refereed]
Academic Journal Multiple authorship
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YAMAZAKI Haruka, MAMIYA Wataru, YOSHIDA Toshiya
Journal of the Japanese Forest Society ( Japanese Forest Society ) 102 ( 3 ) 157 - 165 2020.06 [Refereed]
Academic Journal Multiple authorship
Soil scarification by heavy machinery is often applied to enhance regeneration of tall trees in dwarf bamboo grassland. The "replacement treatment", which spreads the scarified debris to the treated area, is an alternative practice of standard soil scarification to contribute to growth improvement and generation from buried seeds. In this treatment, a deposition period has been set for the purpose of restraining the recovery of dwarf bamboos from rhizomes, but its appropriate period has not been examined. In this study, we compared regeneration of competitive vegetation and tree species among three different deposition periods (0, 2, and 12 months) in consideration of the pre-existence of tall forbs. The recovery of dwarf bamboos was restrained when the deposition period was long. On the other hand, the prevalence of a tall-forb, Fallopia sachalinesis in particular, which germinated from rhizomes increased when it had existed as previous vegetation, and only the 12 months deposition could prevent its dominance. The effect of the prolongation of the deposition period for the regeneration of tall-tree species was positive in Betula and Salix species and negative in Phellodendron amurense. However, the differences among the treatments were unclear where tall forbs had not existed. We conclude that a deposition period of 12 months is required for a site with pre-existing tall forbs, but the replacement without a deposition period can be applied for a site without tall-forbs,
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Haruka YAMAZAKI, Toshiya YOSHIDA
Journal of Forest Research ( Japanese Forest Society ) 25 ( 1 ) 41 - 50 2020.01 [Refereed]
Academic Journal Multiple authorship
Soil scarification removed surface layers including nutrients and buried seeds. The purpose of this study was to evaluate the success of alternative practices that intentionally leave the surface soil (screening and replacing) along with the standard scarification. We focused on soil properties, the density of buried seeds, the invasion of competitive vegetation, and the regeneration of tree species. There were significant differences in soil properties among the treatments. Soils that were treated with the replacing treatment had the highest water contents from the surface layer to the deep layer in the lower slope in particular. On the other hand, there were higher densities of tall forb germinated from rhizomes, which are likely to shade tree species, with the replacing in the lower slope locations. The residual buried seed densities in the soil were estimated to be significantly higher in the screening than the replacing. Phellodendron amurense, producing seed bank and having dry tolerance, exhibited the greatest seedling density with the screening. However, there was no significant difference between screening and replacing in Betula species which has higher water demands. In conclusion, it is important that screening and replacing should be used properly according to the site condition and target tree species. The replacement had the advantage of retaining higher water content, but it is suggested that the screening is a better option when intended for regeneration from buried seeds and when many tall forb species grow alongside dwarf bamboo prior to treatment.
Association Memberships 【 display / non-display 】
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2020.12
Japan Forest Technology Association
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2020.10
The Tohoku Society of Forest Science
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2013.04
The Japanese Forest Society
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2013.04
The Ecological Society of Japan
Academic Activity 【 display / non-display 】
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2022.02-2022.03
The Japanese Forest Society