Influence of Fertilization on Native Plants and Exotic Pasture Grasses on the Fascined Landslide Slopes in Mikura-Jima Island, Japan

Arase, Teruo

doi:10.21660/2015.16.4177

Cited by 4 publications

(5 citation statements)

References 6 publications

(8 reference statements)

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“…The root system of vegetation has the function of stabilizing slopes and preventing landslides [6]. Therefore, there are many studies on vegetation restoration in landslide sites [7][8][9][10]. However, artificial reforestation on an abandoned ski slope is impractical due to the expenses involved.…”

Section: Introductionmentioning

confidence: 99%

Natural Regeneration and Artificial Thinning for Early Forest Restoration on a Permanently Closed Ski Slope

Shirota¹

2021

GEOMATE

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In recent decades, numerous ski resorts in Japan have had to close due to financial difficulties. Forest restoration on these abandoned ski slopes is necessary for landscape management and to prevent avalanches and landslides. However, forest restoration activities are hindered by the scarcity of nutrients due to topsoil removal at the time of ski slope construction. In this study, the effect of thinning on alleviating competition for soil nutrients was examined. The study site was located on Mt. Tateshina in central Japan. The study site's ski slope was closed permanently in 1997, and the first natural regeneration of larch occurred in 1998. Chubu Regional Forest Office performed artificial thinning in 2003. Two thinned, nine un-thinned quadrat plots in 2016 were established and measured the total height and diameter at all living and dead trees' breast height. Tree-ring analysis of nine sample trees in each of the un-thinned and thinned plots at 1 m height intervals was performed to clarify tree growth. The un-thinned field had a high tree density, small tree size, and numerous dead trees, suggesting the existence of severe competition. Conversely, the thinned plot was characterized by a lower tree density, large tree size, and fewer dead trees. According to the tree-ring analysis, artificial thinning improved the survival rate and smaller trees' growth rate. It was concluded that the artificial thinning of natural forests on ski slopes is useful for accelerating tree growth and early forest development.

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Section: Introductionmentioning

confidence: 99%

Natural Regeneration and Artificial Thinning for Early Forest Restoration on a Permanently Closed Ski Slope

Shirota¹

2021

GEOMATE

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“…On Mikura-jima Island (Fig. 1), one of the solitary islands of the Izu Islands of Japan in the Pacific Ocean, vegetation recovery following landslides caused by typhoons has been monitored [6,7]. Mikura-jima Island naturally has an 'irregular' vegetation distribution, having many plant species that are representative of a cool temperature zone but that are inconsistent with the previous placement of the entire island into a warm temperature zone.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Temperature Environment on Mikura-Jima Island, Japan Considering Vegetation Recovery

Arase¹

2020

GEOMATE

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Vegetation recovery following landslides caused by typhoons has been monitored on Mikurajima Island, Japan. Despite having a temperature profile of a warm temperate zone, Mikura-jima has many plant species representative of a cool temperature zone. Temperature environment is an essential parameter for determining the development of vegetation and flora, but little data are available for the island. In the present study, we measured atmospheric temperature by thermographs at seven different elevations (130, 300, 400, 500, 600, 700 and 800 m) over a period of 5 years (from 2013 to 2017), and we determined the warm index, cool index and rate of decline with elevation. The lapse rate along elevation gradient was 0.98 ˚C per 100 m for elevations 500 m and below, and 0.66 ˚C per 100 m for elevations 500 m and above. Warm index (W.I.) was estimated to fall below 85 at elevations over about 800 m, which allows the existence of a cool temperature zone. The re-examination of temperature environment in the present study will facilitate planning of goals and evaluation or estimation of vegetational succession on Mikura-jima Island.

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“…It is important to monitor succession of vegetation after its introduction, since plants will grow or decline, and the species composition is altered by surrounding species year after year. As an example, it was reported that the process of vegetational succession on landslide slopes on Mikura-jima Island, where native tree and herb species were initially planted using simple terracing [1], [2]. In contrast, regeneration technology in natural forests has scarcely been studied in Japan.…”

Section: Introductionmentioning

confidence: 99%

Colonization and Morphological Changes of a Sedge Restricting Regeneration After Wind Damage in a Natural Forest

Arase¹

2017

Geomate

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Many old trees were blown down by typhoons in 1959 and 1961 in a natural coniferous forest deep in the mountains of Kiso District, Central Japan, and dense dwarf bamboo subsequently delayed the growth of tree seedlings. Forest engineers have tried to suppress dwarf bamboo to promote the regeneration of arboreal vegetation. However, after suppression of dwarf bamboo, an unknown grass unexpectedly colonized the area and replaced them. Afterward, almost no tree seedlings could be observed in the newly formed community, which seemed to worsen the extent of regeneration. It has been identified that the grass as Carex oxyandra, a native sedge species indigenous to Kiso District. Commonly, Carex oxyandra grows as short as about 10 cm like lawn grass, but it seems to have exceedingly enlarged the size in the community. Thus, investigation on the morphological variation of this sedge in Miure Experimental Forest within the Kiso National Forest was carried out. Leaf blade length, basal tiller length, and number of leaves per tiller were measured in upper and lower stands on three slopes in 2009. Results revealed that leaf blade length and basal tiller length in lower stands were approximately twice as large as those in upper stands on each slope, whereas the number of leaves per tiller was almost the same (8.8-9.4 leaves). Consequently, tussocks of this sedge became large in lower stands on a slope, which made the community overcrowded and damp, restricting tree regeneration.

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Influence of Fertilization on Native Plants and Exotic Pasture Grasses on the Fascined Landslide Slopes in Mikura-Jima Island, Japan

Cited by 4 publications

References 6 publications

Natural Regeneration and Artificial Thinning for Early Forest Restoration on a Permanently Closed Ski Slope

Natural Regeneration and Artificial Thinning for Early Forest Restoration on a Permanently Closed Ski Slope

Characterization of Temperature Environment on Mikura-Jima Island, Japan Considering Vegetation Recovery

Colonization and Morphological Changes of a Sedge Restricting Regeneration After Wind Damage in a Natural Forest

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