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Ecosystem Assessment Lab
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A lab that studies the ecosystems and biodiversity of grasslands, alpine areas, and cities, and links the findings to conservation.
AboutAbout the lab
Aiming to balance the use and conservation of ecosystems
The Ecosystem Assessment Lab seeks to understand how human activities affect ecosystems, and studies management and conservation approaches that balance the use and conservation of ecosystems.
Its research sites include dryland grasslands such as those in Mongolia, alpine wetlands and forests, and cities such as Yokohama and Tokyo.
Using field manipulation experiments and analysis of long-term data, the lab examines how biodiversity and ecosystem stability change under climate change and human activities.
By taking part in overseas field survey projects and international research networks, the lab can also carry out large-scale research.
Key terms
- Field manipulation experiment
- An experiment conducted in the field in which conditions such as climate or the number of plant species are deliberately changed to see how the ecosystem responds.
- Ecosystem stability
- The property by which ecosystem functions are maintained over time without being greatly disrupted, even when the environment changes.
- Long-term time-series analysis
- An analysis that collects data from the same site or region over a long period and examines how it changes over time.
NewsLab news
A study showed that the strongest predictor of the stability of grassland food webs is asynchrony in population fluctuations among herbivores
Conditions under which biodiversity boosts productivity under extreme weather were clarified using experimental data from around the world
An experiment in Mongolian grassland found that the mechanisms supporting stability differ depending on how plant species are lost
A study clarifying the relationship between the arrangement of vacant lots in Yokohama and soil multifunctionality was published
A study clarifying the factors that determine plant community stability in Japanese mountain wetlands was published
ResearchResearch themes
This lab aims to understand how human activities affect ecosystems and to contribute to management and conservation that balance the use and conservation of ecosystems. It studies biodiversity and ecosystem stability mainly in drylands, alpine areas, and cities.
*Illustrative imageDryland Grasslands, Climate Change, and Human Activities
In grasslands around the world, including Mongolia, the lab studies how climate change and livestock grazing affect ecosystems. It examines changes in biodiversity and ecosystem stability through long-term time-series analysis and field manipulation experiments.
*Illustrative imageVulnerability and Conservation of Alpine Wetlands and Forests
The lab assesses the vulnerability of ecosystems to environmental change and studies how to conserve them, focusing on alpine wetlands and forests.
*Illustrative imageBiodiversity Design of Urban Ecosystems
The lab studies the design of urban biodiversity, taking into account the historical effects of urbanization and the needs of an era of population decline. Its subjects include cultural services in satoyama environments on the outskirts of cities and green infrastructure in the Minato Mirai 21 district.
*Illustrative imageTaking a Broad View of Human–Nature Relationships
The lab works to clarify human perception of biodiversity and the processes behind it. It also studies the relationship between people and nature using compiled literature and big data.
MembersFaculty
The members of the Ecosystem Assessment Lab consist of faculty, postdocs, doctoral, master's, and undergraduate students, and administrative assistants.As of 2026
- ProfessorTakehiro Sasaki
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Alpine meadows, Grassland, Georgia” Vyacheslav Argenberg / CC BY 4.0 (cropped)
- Dryland Grasslands, Climate Change, and Human Activities: “Steppe in the lower Don” Fargoh / CC0 (cropped)
- Vulnerability and Conservation of Alpine Wetlands and Forests: “Mountain view in Robson valley” Jakub Fryš (talk · contribs) / CC BY-SA 4.0 (cropped)
- Biodiversity Design of Urban Ecosystems: “Warwick City Park nature trail” ZeLonewolf / CC0 (cropped)
- Taking a Broad View of Human–Nature Relationships: “Satoyama landscape near Hida, Gifu” Seth Vidal / CC BY-SA 2.0 (cropped)
- Related lab (Law, Ecology & Energy Lab): “Landscape with wind turbines - geograph.org.uk - 4916861” Bill Harrison / CC BY-SA 2.0 (cropped)
- Related lab (Socio-Ecological Informatics Lab): “2016. Lake sediment core. Forlorn Lakes. Gifford Pinchot National Forest, Washington. ( )” R6, State & Private Forestry, Forest Health Protection / Public domain (cropped)
- Related lab (Complex Systems Meteorology Lab): “Super Typhoon Bavi (super-typhoon-bavi - 20260705)” NASA Earth Observatory/Michala Garrison / Public domain (cropped)
- Related lab (Environmental and Disaster Risk Education Lab): “School children protest climate change, London (geograph 6063624)” Matt Harrop / CC BY-SA 2.0 (cropped)
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