Iwao Uehara

• Ph.D
• Professor (Full) at Tokyo University of Agriculture

Currently, aging in local communities is a major social issue in Japan. At the same time, the increase in abandoned forests in various regions is also a major issue. However, if the health and recreation functions of forests can be effectively utilized, local forests have great potential for promoting the health of local elderly people, preventing...

An aging society is currently a feature of our country, and health promotion for the elderly has also become an issue. Many elderly people suffer from some kind of disease or poor physical condition, feel anxious about their health, and it is not uncommon for elderly people to spend the rest of their lives in social welfare facilities. Under these...

This paper shows a case where a hospital-owned secondary forest of broad-leaved trees, which had been abandoned for more than 30 years, was developed for patients' rehabilitation and recreation at a regional hospital in Tokyo. The survey site is Ongata Hospital and its forest (approximately 6 ha) located in suburb of Hachioji City. The owned forest...

Lianas (woody vines) are important components of forest ecosystems and are often found to proliferate in young forests that have experienced large-scale disturbances. However, little is known regarding the mechanisms of the spatial assembly patterns of co-occurring lianas and trees in the temperate secondary forest stands. In this study, we examine...

In this study, we thinned an artificial cypress forest in Minamisoma City, Fukushima Prefecture, and conducted a subsequent vegetation survey. The survey targets were a forest stand that is approximately 30 years old and has never been thinned or pruned (Haramachi district), and a young forest that is approximately 20 years old and has been pruned...

Approximately 70% of Japan's land area is covered with forests, so it is sometimes called a forest country. There are four types of forest belts: subarctic forest, temperate forest, temperate forest, and subtropical forest, and biodiversity in the forest is high. On the other hand, however, there is an annual increasing number of "abandoned forests...

Abstract：It has been reported that some forests in the Soma area of Fukushima Prefecture have high concentrations of radioactive cesium since the accident at the Fukushima Daiichi nuclear power plant in March 2011. However, the actual situation has not been clarified in many cases, and there are still high requests for scrutiny from local residents...

Abstract: Larix kaempferi is a woody plant of the genus Larix Pinaceae. It is only one native deciduous coniferous trees in Japan. Larix kaempferi is a strong intolerant tree and grows fast. It is also a pioneer species and invades bare areas such as ground covered by volcanic ash and gravel. The soil demand of Larix kaempferi is low, therefore, a...

COVID-19 has been spread out world widely since it had been reported in Wuhan city in China in 2019. It has brought various limitations in our daily lives and it has given negative impacts on schools and campus lives, too. Therefore, educational society has mainly taken measures website delivery learning materials against COVID-19. In these sequenc...

Belowground ectomycorrhizal (ECM) fungal communities are affected by the dominant tree species of aboveground vegetation. We investigated ECM-fungal communities in the boundary between secondary broad-leaved forests dominated by ECM trees and cypress plantations consisting of arbuscular trees. ECM root tips were collected from soil cores and seedli...

Department of Forest Science (former name: Forestry established in 1947) of Tokyo University of Agriculture (TUA) practices "Forest training" for freshman and sophomore students every year. 140 students annually attend on the training. Forest training on sophomore is consisted of silviculture curriculum and programs. The training is practiced by di...

Thinning cut facilitates natural regeneration of woody species on the forest floor. This research surveyed the natural regeneration of Lindera umbellata at the floor of artificial Chamaecyparis obtusa stand. It also aimed to reconsider how thinning rate have effects on the distribution of Lindera umbellata. The survey plots were 30%, 50%, 70% thinn...

Lindera praecox is a woody plant of Camphoraceae, Lindera that has peculiar fragrance. It contains oily component and it has been used for firewood. Its fruit had made desk lamp oil, too. Natural distribution of Lindera praecox broads Honshu Island to Kyushu Island in Japan. It can grow on the floor and edge of artificial Criptmeria japonica and Ch...

After the nuclear power plant accident in Fukushima, radionuclides were deposited over a large area of local forest. However, almost nothing is known about radionuclide infiltration into trees. Here, we used poplar seedlings as a model to show that radiocesium can enter directly into leaves and bark, moving via ray cells through the symplastic path...

The earthquake and tsunami on 11 March 2011 led to a meltdown followed by a hydrogen explosion at the Fukushima–Daiichi nuclear power plant in Japan, causing the dispersal of abundant radionuclides into the atmosphere and ocean. The radionuclides were deposited onto trees and local residences in aerosol or gaseous forms that were partly absorbed by...

We investigated whether ectomycorrhizal (ECM) fungal species exhibit antibacterial activity towards culturable bacterial communities in mycorrhizospheres. Four hundred and thirty bacterial strains were isolated from the ECM root tips of Pinus densiflora and bulk soil, and 21 were co-cultured with six ECM fungal species. Three hundred and twenty-nin...

】 Forest practice covers various matters, which are pruning, thinning, weeding, and so forth. These treatments make tree and tree stand shapes. If these shapes could indicate forest condition or success of forest practice, they would be very useful indicators for forestry and foresters. Therefore, this study attempts to show some ideas of mathemati...

Pyloligneous acid (wood vinegar) is produced as by-product in the making of charcoal. It has been utilized as a soil improvement material, agricultural chemical, and deodorant. However, its antibacterial effects are not yet clear and each tree species has different antibacterial effects. Larix kaempferi is only one species which is an autogenous de...

Pterostyrax hispida sometimes grows in colonies under the artificial Larix leotolepis stands in the Kanto districts or Central part of Japan. This study researched the natural distribution of Pterostyrax hispida at artificial Larix leptolepis stands in the 800 to 900 meters altitude in the Okutama Training Forest of Tokyo University of Agriculture....

The Forest Science Department (annual capacity: 140 students) of Tokyo University of Agriculture (TUA) has a special education system which contains 9 laboratories. These 9 laboratories are Silviculture, Forest Ecology, Erosion Control and Revegetation Engineering, Forest Engineering, Forest Products Chemistry, Wood Science and Technology, Forest M...

Lindera umbellata Thunb has a special sweet fragrance. It has been used as tooth picks for Japanese traditional cakes, but recently it has been also utilized as medical liquor and a bath solution. Demands for it as a medical plant have been also increasing. Therefore, producing stocks has another possibility for rural forests. This study attempted...

要旨：育苗の手法、材料には、様々なものが報告されている。本報では、林地残材の有効活用の一環として、林内に放置されたスギ、ヒノキ、カラマツの間伐材より繊維状の木質チップを作製し、それを挿し床として利用して、その活着率を調べた。挿し木の試供木にはポプラ（Populus nigra）を使用し、長さ20ｃｍの挿し穂を作った。上記のスギ、ヒノキ、カラマツの木質チップをそれぞれプランター（縦60×横22×深さ16cm）に入れ、１つのプランターに10本ずつ、計40本（計４プランター）を挿しつけた。なお、対照区として、鹿沼土を挿し床にしたプランターも同数もうけ、それぞれの生長の比較を行った。木質チップの挿し床の含水率はいずれも高く、また苗木の安定性も低かったため、いずれの挿し床においても活着率は著しく低く、...

Annually, enormous amounts of mushroom beds are dumped throughout Japan. Dealing with them is one of the difficult problems among mushroom farmers. In addition, the farmers fumble to find effective practical uses for these discarded mushrooms. This research examined the bacterial resistance of pyroligneous acid which is made from dumped mushroom be...

Abstract：The Forest Science Department (annual capacity: 140 students) of Tokyo University of Agriculture (TUA) has a special education system which contains 9 laboratories. These 9 laboratories are Silviculture, Forest Ecology, Erosion Control and Revegetation Engineering, Forest Engineering, Forest Products Chemistry, Wood Science and Technology,...

Great East Japan Earthquake occurred on the 11th of March, 2011 and 4 days later, Tokyo Electric Power Company (TEPCO) Fukushima No.1 nuclear power plant accident also happened. The accident caused serious nuclear pollution damage for Fukushima area, and it was reported that the forest area had been especially received severe damage. However, its p...

What is Forest Therapy and its possibility

Forest Therapy has been born in Japan. But there is a great misunderstanding. There are two types of Forest Therapy in Japan. One is defined in 1999 at Japanese Forestry Society. It has aimed to promote health of both of forest and human beings.It is called ”Shinrin Ryoho” in Japanese. The other is established in 2005. It has aimed to make health r...

The Great East Japan Earthquake occurred on March 11, 2011, and 4 days later, the Tokyo Electric Power Company (TEPCO) Fukushima No. 1 Nuclear Power Plant accident happened. The accident caused serious nuclear pollution damage for the Fukushima area, and it was reported that the forest area had received especially severe damage. However, its presen...

Many studies have reported that forest can promote human health. Forest amenities might have effects of preventing illness, producing relaxation place, rehabilitation environment, care & treatment place for disabilities, peaceful counseling space, and so forth. By experiencing forest activities for a long term and constantly, clients with mental, p...

This research examined the antibacterial effects of volatile fragrance of leaves of Cercidiphyllaceae japonicum and Cedrus deodara which have strong fragrance. The samples were collected 24 hours on 21st to 22nd of June and 10th to 11th of August in 2012. We used Escherichia coli and Staphylococcus aureus subsp. aureus which are ordinary bacterium...

In the psychological and counseling fields, many studies have been attempted by various methods. This research attempted to examine the counseling effects utilizing urban green environment which were on the university campus and an urban park in Setagaya region in Tokyo. I researched how university students' mood changed in the building and in the...

It has been known that the distilled water made from tree leaves, which contain essential oil, sometimes have bacteria resist effects. This research examined the stimulating effects of distilled water of tree leaves for the growth of the cuttings. Experiments used cuttings of Ginkgo biloba and Populus nigra. Distilled water was made of leaves of Gi...

This research examined the bacteria resistance effects by volatile fragrance and distilled water of leaves of Cinnamomum camphora. The samples were collected for 24 hours on 21 st to 22 nd of June and 10 th to 11 th of August in 2012. We used Escherichia coli and Staphylococcus aureus which were ordinary bacterium in daily life. The experiment resu...

This research examined the bacteria resistance effects by volatile fragrance of Cinnamomum camphora and Eucalyptus grobulus. Experiments used Escherichia coli and Staphylococcus which were ordinary bacterium in daily life.. The experiment results of Cinnamomum camphora showed the volatile fragrance could resist the glowing of Escherichia coli, but...

We collected seeds of Pterostyrax hispida from a 12 year-old autogenous mother tree in the Okutama university forest of Tokyo University of Agriculture. We cleaned and examined the seeds to research the characteristics and germination. The maturation rate was 59.0% by sifting the seeds and removing impurities. The wind selection was not effective t...

Structured Group Encounter (SGE) is a useful, preventive, and developnetal counseling group activity. SGE is used for people to understand each other and develop relationships at work places, schools, social welfare institutions, and so forth. It is generally used indoors but also has potential as an outdoor activity. Individuals with developmental...

The healing functions of woodland have become more important for our stressful modern lives. Counseling works also have important meaning in our daily lives and working places. Active counseling works can be physically effective in outdoor exercise and recreational activities, too. Therefore, counseling works utilizing familiar woodland might have...

Outdoor activities, including therapeutic horticulture, have become important recreations for older adults, physical rehabilitation patients, and individuals with developmental disabilities. Many horticultural activities have been provided dor these groups of people and the the results of these activities have been reported. Therapeutic horticultur...

This paper shows the staff's estimation and consideration about the treatment effects of outdoor activities attempted at the instituion for persons with developnetal disabilities in Nagano Prefecture, Japan. By interviewing each staff menber, it was made known that most of them think the outdoor activitites are important for residents and the activ...

Forest amenities have various important meanings in our modern lives. Forests and woods supply the recreational space and other amenities for people's needs for nature. Forest recreation is important not only for healthy people, but also for persons with mental or physical disabilities. This paper reconsiders some forest recreations in the treatmen...

Counseling is being done in many ways.However, cliens who need counseling do not always have good communication ability. Some clients who have mental disabilities or communication disorders do not have communicative abilities. Autism is a syndrome of impairmants in the development of reciprocal social interactions, verbal and nonverbal communicatio...

Forest amenity is not only important for general forest recreational activities but also treatment, rehabilitation, and therapy for people with mental or physical disabilities. It is not, however, easy to find suitable forest sites for the treatment activities. Autism is known as one of the disabilities of the brain.The main symptoms are discommmun...