( ( These reactions ) ( ( ( produce ( ( large amounts ) ( of ( methane ( and ( carbon dioxide ) ) ) ) ) ) ( as ( ( a result ) ( of ( ( microbial degradation ) ( of ( ( organic matter ) ( in ( the sediments ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (NNS reactions)) (VP (VBP produce) (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (NN methane) (CC and) (NN carbon) (NN dioxide)))) (PP (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (NP (JJ microbial) (NN degradation)) (PP (IN of) (NP (NP (JJ organic) (NN matter)) (PP (IN in) (NP (DT the) (NNS sediments)))))))))) (. .)))
These reactions produce large amounts of methane and carbon dioxide as a result of microbial degradation of organic matter in the sediments.
(ROOT (S (NP (NP (NNS Sediments)) (PP (IN in) (NP (JJ oligotrophic) (NNS lakes)))) (VP (VBP contain) (NP (NP (JJ large) (NNS amounts)) (PP (IN of) (NP (JJ decomposable) (JJ organic) (NN matter))))) (. .)))