Study

Growth potential of three Sphagnum species in relation to water table level and peat properties with implications for their restoration in cut-over bogs

  • Published source details Grosvernier P., Matthey Y. & Buttler A. (1997) Growth potential of three Sphagnum species in relation to water table level and peat properties with implications for their restoration in cut-over bogs. Journal of Applied Ecology, 34, 471-483.

Summary

In order to assess the potential of revegetation of cut-over peat bogs in bogs of the Swiss Jura, a glass house experiment was conducted. Growth in length and weight of three species of Sphagnum moss (S.fuscum, S.magellanicum and S.fallax) on five different peat types and two water levels was studied.

Sphagnum species: Three species of Sphagnum moss commonly found in the Swiss Jura bogs, and also abundant else where in the northern hemisphere were grown in a glasshouse experiment: S.fuscum, S.magellanicum and S.fallax. Circular mats 13.3 diameter x 5 cm thick of sphagnum were collected in the field for the purpose of the glass house experiment conducted at Neuchâtel.

Peat and water table: The Sphagnum mosses were cultivated in PVC pots at natural density on cores of five different peat types, representing a gradient of increasing disturbance. Two water levels (-1 cm and –40cm) were controlled and maintained to simulate natural and drained situations. There were three replicates of each treatment (90 pots in total).

Greenhouse climate: Shading was provided at about 80% to ensure the glasshouse did not overheat whilst maintaining suitable incident light for growth. Rainwater was used to maintain moisture as required (300 mL water sprayed on each pot).

Growth: Ten Sphagnum plants, cut to 5 cm in length and marked with a polyester thread, were measured for growth rate and dry weight.

Sphagnum growth was most influenced by the water level, rather than peat type. S.fallax in particular was strongly dependent on water level. At high water level its growth in length was much greater than the other two species. Also despite its slender form, mass increments were similar to those of S.magellanicum.

S.fallx clearly had the highest growth at high water levels, reflecting the field conditions that it has been observed growing best. Yet, in the Swiss Jura Mountains, it is the most widespread species in paludification processes of drained bogs (i.e. bog expansion resulting from the gradual rising of the water table as accumulation of peat impedes water drainage) after the cessation of peat mining or harvesting. The reasons for this include its good resistance to desiccation and recovery ability, greater efficiency of photosynthesis at low humidity, fast growth rate (as observed in this experiment), and its capacity to grow horizontally.

Peat type was influential only when the water table was at a low level (-40 cm), simulating drained conditions. Results of analyses taking into account peat physical and chemical properties show that drained sites undergo a strong chemical disturbance, which affects Sphagnum growth. However, depending on the evolution of the peat, a particular combination of chemical and physical properties may actually favour Sphagnum growth even at a low water table.

Conclusions: Results from this glasshouse experiment, suggest that S.fallax should be favoured above S.fuscum and S.magellanicum as a pioneer in bog restoration to stimulate rapid colonization and recovery of Sphagnum on which other species characteristic of ombrotrophic bogs can re-establish.


Note: If using or referring to this published study, please read and quote the original paper, this can be viewed at: http://links.jstor.org/sici?sici=0021-8901%28199704%2934%3A2%3C471%3AGPOTSS%3E2.0.CO%3B2-9

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 19

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust