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.