Short-term effects of single-tree selection cutting on stand structure and tree species composition in Valdivian rainforests of Chile

New Zealand Journal of Forestry Science

Table 4 Mean number of trees per hectare per diameter class (trees dbh ≥ 5 cm) and height strata (trees dbh ≥ 10 cm) before and after harvesting. Diameter classes and height strata are explained in Table 3. Values are expressed as mean ± 1 standard deviation. Significant treatment differences with the control are shown through an asterisk after the mean number of trees, with p = 0.05–0.01, p = 0.01–0.001 and p ≤ 0.001, respectively. Significant harvesting impacts are mentioned in the text

	Control	High residual basal area (HRBA)		Low residual basal area (LRBA)
	Control	Before	After	Before	After
Diameter class
Total	1039 ± 252	1579 ± 301*	1491 ± 295*	1455 ± 202*	1331 ± 190
Very small	494 ± 166	895 ± 167**	861 ± 164*	849 ± 140*	818 ± 156*
Small	258 ± 115	446 ± 141*	429 ± 130	384 ± 50	363 ± 53
Intermediate	175 ± 29	134 ± 31	126 ± 27*	130 ± 11*	101 ± 18**
Large	89 ± 33	90 ± 27	68 ± 14	88 ± 41	48 ± 12*
Very large	22 ± 13	14 ± 15	8 ± 6	5 ± 4	3 ± 3*
Height stratum
Total	533 ± 137	–	624 ± 141	–	510 ± 58
Low understorey	42 ± 32	–	84 ± 43	–	75 ± 35
Upper understorey	114 ± 62	–	271 ± 90*	–	211 ± 35
Low canopy	172 ± 72	–	195 ± 75	–	159 ± 52
Upper canopy	136 ± 36	–	55 ± 21**	–	55 ± 12**
Emergent	72 ± 39	–	19 ± 22*	–	10 ± 8*