( ( During ( periods ( of ( drought ( or ( sunlight deprivation ) ) ) ) ) ) ( ( -LRB- ( ( ( as , ) ( ( ( a ( small tree ) ) ( under ( a ( dense forest ) ) ) ) canopy ) ) -RRB- ) ) ( ( the rings ) ( ( are narrow ) . ) ) ) )
(ROOT (S (PP (IN During) (NP (NP (NNS periods)) (PP (IN of) (NP (NN drought) (CC or) (NN sunlight) (NN deprivation))))) (PRN (-LRB- -LRB-) (SBAR (IN as) (, ,) (S (NP (NP (DT a) (JJ small) (NN tree)) (PP (IN under) (NP (DT a) (JJ dense) (NN forest)))) (VP (VBZ canopy)))) (-RRB- -RRB-)) (NP (DT the) (NNS rings)) (VP (VBP are) (ADJP (JJ narrow))) (. .)))
During periods of drought or sunlight deprivation (as, a small tree under a dense forest canopy) the rings are narrow.
(ROOT (S (SBAR (IN Because) (S (NP (NNS trees)) (VP (VBP add) (NP (NN water) (NN vapor)) (PP (TO to) (NP (NN air)))))) (, ,) (S (VP (VBG cutting) (PRT (RP down)) (NP (NNS forests)))) (VP (VBZ leads) (PP (TO to) (NP (NP (JJR longer) (NNS periods)) (PP (IN of) (NP (NN drought)))))) (. .)))