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Wetland vegetation and conservation (湿原植生と保全)

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily


Wetlands I have ever researched (= I have written the papers)
Wetlands I have ever seen (= I have never written the papers)


Everybody in Ruoergai
Center: Umeda (leader) and the
late Tsujii (sub-leader)

I began wetland researches after an overseas survey in the Sichuan Province of China, 1988. I was surprised when I knew that I had never written about wetlands in Japan until 2003. I think this is not so good when I knew this fact. So, I began wetland researches in Japan in 1995. The study site is Otanoshike wetland in Kushiro, eastern Hokkaido. But, that was a simple survey, i.e., the measurements of vegetation only.
Thereafter, we measured methane flux in a Siberian wetland. I talk about wetlands sometimes in my lectures, and at that time I feel that the importance of wetland again and again, to protect nature.

A start

That was an annual meeting of Ecological Society of Japan at Hokkaido Branch. I was 1st grade of doctoral course.

Prof. K of H University at K asked me: "You wanna go China?"
I: I promptly replied, "Sure."

In the summer of that year, I was on the largest wetland in China.

Field trip by horse
We went to the research site by riding horse once. Somebody fell off his horse.

Wetlands I have ever researched. I have ever written the papers


Ruoergai grassy marshland

Peat Distribution in China
Fig.2. The type of the peatland in Ruoergai Mountain Plateau
This is the start of my wetland research.
Research summary
That's all I did in Ruoergai.

peatland in China

Sandaohu wetland

The research was postponed, due to Tiananmen massacre taking place in the year (1989). The first plan was going in summer, but we went in the season with leaf fall. It was cold, and most herbs were withered.
I measured Larix (larch) and Betula (birch), because I could not do anything more (Tsuyuzaki 1994).

State Environmental Protection Key Laboratory for Wetland Conservation and Vegetation Restoration (established in NENU, China)

June 6 2017)


Wetlands and hot springs near Spirit Lake on Mount St. Helens

Measured seedbank in the wetland by Mandy and Jon (Tu et al. 1998)
I walked for a half of day, because I lost my way, (not for finding out wetlands, though).
I remembered somebody said, "This is science!"


We started revegetation patterns on Piceae mariata forests after severe wildfire in 2004. The progressive summary will be shown in a page "Fire Ecology". Also, we reported the forest-floor vegetation recovery (Tsuyuzaki et al. 2013) and seedling establishment patterns (Tsuyuzaki et al. 2014). The recovery of albedo was determined mostly by vegetation recovery (Tsuyuzaki et al. 2009).
In 2006, we went to ANWR (Arctic National Wildlife Refuge) where permafrost is distributed. We measured vegetation on and around palsas in the tundra (Tsuyuzaki et al. 2008).
Now we have a plan to integrate the revegetation patterns of taiga and tundra.


Kolyma River, Sakha Republic, taken from a boat. We can see a sparse larch forest
A gully surveyed (Tsuyuzaki et al. 1999). I went to Siberia twice, and this survey was conducted in the first year.

Measured the relationships between methane flux and vetation types near Kolyma River (Tsuyuzaki et al. 2011).
Vegetation patterns in gullies developed by melting ice wedge (Tsuyuzaki et al. 1999)

A mosquito came into my eye. It was in imminent danger, because we might not return by the coast covered with floating ice. Then, I got Dr. Sato's wise remarks, "The nature of Siberia has been kept by mosquitoes." At that time, I wanted to say "Give me job, if you feel...". Everbody said my shoulder was crying. Certainly, nothing was good when I went back the university.

Keywords to understand Alaskan and Siberian wetlands

permafrost and its related topography, such as:

polygon, yedoma, ice wedge, palsa, pingo, baidzharakh (Tsuyuzaki et al. 2010)


Tropical peatland - What is this?

The vegetation patterns was explained by the distance from rivers (Mirmanto et al. 2003) and seedling establishment was related to microtopography in peat swamp and heath (Nishimura et al. 2007).

Wetlands I have ever seen. I have never written the papers


I can not find out any photos that show Canadian wetlands. I guess this job will have not been published, perhaps forever).

Japan (日本)


The volcano Mount Usu

Wetland developed in the 4th Crater on Mount Usu in the 1977-78 eruptions is very quick and fast (Tsuyuzaki 1997).

Otanoshike marshland

We showed the importance of scale-dependent environmental factors by the survey in a part of Kushiro mire (Tsuyuzaki et al. 2004).

Hotoke Swamp

Basically, the researches were conducted by Kimura. We found out a huge seedbank in the swmap after a prescribed fire (Kimura & Tsuyuzaki 2011).

Sarobetsu, northen Hokkaido

Keywords related to research in Sarobetsu mire

Un-mined area1 Un-mined area2
[1] research site in Sarobetsu wetland. A weather station is established close from here. We can see a weathercock is spinning. [2] the post-mined peatland seeing from an airplane (supported by Asahi Newspaper) on April 4 2006.
Other wetlands
The abrupt boudary between plant communitites was described in Kiritappu mire (Tsuyuzaki & Haraguchi 2009).

References on wetlands

  • Egawa, C. & Tsuyuzaki, S. 2011. Seedling establishment of late colonizer is facilitated by seedling and overstory of early colonizer in a post-mined peatland. Plant Ecology 212: 369-381
  • Egawa, C. & Tsuyuzaki, S. 2013. The effects of litter accumulation through succession on seed bank formation for small- and large-seeded species. Journal of Vegetation Science 24: 1062-1073
  • Iwata, H., Ueyama, M., Harazono, Y., Tsuyuzaki, S., Kondo, M. & Uchida, M. 2011. Quick recovery of carbon dioxide exchanges in a burned black spruce forest in interior Alaska. SOLA 7: 105-108
  • Koyama, A. & Tsuyuzaki, S. 2012. Mechanism of facilitation by sedge and cotton-grass tussocks on seedling establishment in a post-mined peatland. Plant Ecology 213: 1729-1737
  • Koyama, A. & Tsuyuzaki, S. 2013. Facilitation by tussock-forming species on seedling establishment collapses in an extreme drought year in a post-mined Sphagnum peatland. Journal of Vegetation Science 24: 478-483