Paper 8

Aquatic graminoid plants have ______ rates of CH4 flux compared to drier plant communities

• Higher

• Similar

• Lower

• We are still trying to find this out

T/F: Stepwise regressions were created to relate variables to biomass. Plant height for C. aquatilis and Sum of leaf length for A. fulva best explained this

• True

• False

Answer explanation

Plant height: A fulva

Sum leaf: C. aquatilis

CH4 flux for A. fulva was best strongly associated and best explained by _____

• thaw depth+water depth

• soil temperature

• biomass

• nothing, science is hard

The summed fluxes of CH4 for both aquatic graminoids has _____ in the past 40 years

• not changed

• increased slightly

• tripled

• doubled

Both plant species have a combined land surface of less than __% but are responsible for 2/3 of total CH4 flux in the region

• 67%

• 5%

• 3%

• 10%

Correlations and Regressions are synonymous and can both be used to predict future trends

• true

• false

Did both species show similar rates of CH4 flux?

• yes, no differences between the two

• no, A. fulva flux was higher

• I miss the lemmings, plant interactions are hard

• no, C. aquatilis was higher

Temperature had no direct effect on aquatic plant biomass change, so the 2 main attributing factors in last 40 years were

• longer growing season+ increased nutrients

• temperature + hotter days

• water depth + thaw depth

• other plants + solid permafrost

You don't need to worry about any assumptions in regression analysis like normality, residuals or linearity

• true

• false

• :)