( ( ( Physical fractionation ) ( of ( ( soil ( organic matter ) ) ( in ( primary ( particle ( ( size and ) density ) ) ) ) ) ) ) ( separates . ) )
(ROOT (S (NP (NP (JJ Physical) (NN fractionation)) (PP (IN of) (NP (NP (NN soil) (JJ organic) (NN matter)) (PP (IN in) (NP (JJ primary) (NN particle) (NN size) (CC and) (NN density)))))) (VP (VBZ separates)) (. .)))
Physical fractionation of soil organic matter in primary particle size and density separates.
(ROOT (S (NP (NP (NNP Density)) (PP (IN of) (NP (NN matter)))) (VP (VBZ reflects) (SBAR (WHADVP (WRB how) (RB closely)) (S (VP (VBD packed) (SBAR (S (NP (NP (DT the) (NNS particles)) (PP (IN of) (NP (NN matter)))) (VP (VBP are)))))))) (. .)))