( ( Natural succession ) ( ( could ( threaten ( ( the future ) ( of ( this ( habitat type ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Natural) (NN succession)) (VP (MD could) (VP (VB threaten) (NP (NP (DT the) (NN future)) (PP (IN of) (NP (DT this) (NN habitat) (NN type)))))) (. .)))
Natural succession could threaten the future of this habitat type.
(ROOT (S (NP (JJ Secondary) (NN succession)) (VP (VBZ is) (NP (NP (DT the) (NN type)) (PP (IN of) (NP (NN succession))) (SBAR (WHNP (WDT that)) (S (VP (VBZ happens) (PP (IN after) (NP (NP (DT the) (NN destruction)) (PP (IN of) (NP (DT a) (NN habitat)))))))))) (. .)))