( ( The study ) ( ( ( uses ( mass-balance ( chemical ( and ( isotopic ( hydrograph separations ) ) ) ) ) ) ( to ( ( determine ( different ( flowpath contributions ) ) ) ( to ( ( ( surface ( water runoff ) ) ( in ( ( ( two ( small ( alpine streams ) ) ) and ) ( their changes ) ) ) ) ( over time ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN study)) (VP (VBZ uses) (NP (JJ mass-balance) (NN chemical) (CC and) (JJ isotopic) (NN hydrograph) (NNS separations)) (S (VP (TO to) (VP (VB determine) (NP (JJ different) (NN flowpath) (NNS contributions)) (S (VP (TO to) (VP (VB surface) (NP (NN water) (NN runoff)) (PP (IN in) (NP (NP (CD two) (JJ small) (NN alpine) (NNS streams)) (CC and) (NP (PRP$ their) (NNS changes)))) (PP (IN over) (NP (NN time)))))))))) (. .)))
The study uses mass-balance chemical and isotopic hydrograph separations to determine different flowpath contributions to surface water runoff in two small alpine streams and their changes over time.
(ROOT (S (NP (DT A) (NN student)) (VP (MD should) (VP (VB use) (NP (DT a) (NN balance) (S (VP (TO to) (VP (VB compare) (NP (NP (DT the) (NNS masses)) (PP (IN of) (NP (CD two) (JJ small) (NNS rocks)))))))))) (. .)))