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Conclusion

There are four main conclusions from the current study:

i) There is a seasonal change in CH 4 emissions.

ii)  There are no trend with unique peaks in the within day variation for P. australis and C. rostrata.

iii) The CH 4 emissions from P. australis and C. rostrata are relatively similar when considering per m 2 , but substantially higher for P. australis compared to C. rostrata recorded per g DW per m 2 .

iv)  Type of lake (Lake Erssjön or Lake Följesjön) and air temperature is the most important environmental factor controlling CH 4 emissions from emergent aquatic macrophytes calculated emissions per m 2 , closely followed by light, wind and the date during the growing season.

Summary

In summary, finding variables controlling CH4 emissions from emergent aquatic macrophytes is not easy. However, the study concludes that air temperature is the most important key variables affecting CH4 emissions. The relationship between CH4 emissions and air temperature explained the changes in CH4 emission during the growing season. The type of species is not important if CH4 emissions are calculated per m2, this result makes it easier to include emergent aquatic macrophytes in the global CH4 budget. At the same time, increased air temperature affect the CH4 production in the sediment, where lakes like Lake Följesjön have a larger amount of organic matter in the sediment and the CH4 emissions to the atmosphere increase. 


Responsible for this page: Agneta Johansson
Last updated: 05/21/15