( ( Pore space ) ( ( is ( that ( ( part ( of ( ( ( the ( bulk volume ) ) ( of soil ) ) ( that ( ( ( ( is not ) ( occupied ( by ( ( ( either mineral ) or ) ( organic matter ) ) ) ) ) but ) ( is ( open space ) ) ) ) ) ) ) ( occupied ( by ( either ( ( gases or ) water ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Pore) (NN space)) (VP (VBZ is) (SBAR (IN that) (S (NP (NP (NN part)) (PP (IN of) (NP (NP (DT the) (JJ bulk) (NN volume)) (PP (IN of) (NP (NN soil))) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ is) (RB not) (ADJP (VBN occupied) (PP (IN by) (NP (NP (DT either) (NN mineral)) (CC or) (NP (JJ organic) (NN matter)))))) (CC but) (VP (VBZ is) (NP (JJ open) (NN space))))))))) (VP (VBD occupied) (PP (IN by) (NP (DT either) (NX (NX (NNS gases)) (CC or) (NX (NN water))))))))) (. .)))
Pore space is that part of the bulk volume of soil that is not occupied by either mineral or organic matter but is open space occupied by either gases or water.
(ROOT (S (NP (DT The) (NN term) (NN volume)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (S (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space)))) (ADJP (VBN occupied) (PP (IN by) (NP (NP (DT a) (NN sample)) (PP (IN of) (NP (NN matter)))))))))))) (. .)))