Selection of dipterocarp species for enrichment planting in a secondary tropical rainforest

Figures & data

Figure 1. Forest research area, PT Sari Bumi Kusuma forest concession, Central Kalimantan, Indonesia.

Figure 2. Survival rate of dipterocarps at 1 year, 6.5 years, and 12.5 years after planting.

Table 1. Analysis of variance of dipterocarp species 12.5 years after planting.

Source	Variables	df	Mean square	F value
Block	Survival rate	3	2173	5.23
	DBH	3	16.42	1.54
Species	Survival rate	22	990.61	2.40*
	DBH	22	71.32	6.67**

Note: DBH: diameter obtained 12.5 years after planting; *: significant at 0.05 level of probability; **: significant at 0.01 level of probability

Figure 3. Average DBH and MADI of dipterocarp species 12.5 years after planting.

Figure 4. Pairwise correlations (Pearson’s) among DBH, pilodyn penetration, and stress wave velocity of dipterocarp species 12.5 years after planting. Note: DBH: diameter at breast height (1.3 m above ground); PP: pilodyn penetration depth; SWV: stress wave velocity.

Table 2. Analysis of variance of pylodin and stress wave velocity of dipterocarp species 12.5 years after planting.

Source	Variables	df	Mean square	F value
Block	PP (mm)	3	18.58	2.39
	SWV (km/s)	3	0.10	1.85
Species	PP (mm)	22	110.44	14.19**
	SWV (km/s)	22	0.07	1.26 ns

Note: PP: pilodyn 12.5 years after planting; SWV: stress wave velocity 12.5 years after planting; **: significant at 0.01 level of probability; ns: nonsignificant at 0.05 level of probability

Table 3. Average Pilodyn Penetration Depth (PP), transmission time per length basis (T_m) and stress wave velocity (SWV) of dipterocarp species 12.5 years after planting.

No	Species	PP (mm)								Tm (µs/m)	SWV (km/s)
1	S. seminis	15.98	a							248	4.03
2	H. mangerawan	16.73	a							274	3.65
3	S. leavis	16.83	a							248	4.03
4	D. caudiferus	18.00	a	b						256	3.9
5	S. singkawang	21.00	a	b	c					260	3.85
6	S. lamellata	21.65	a	b	c	d				250	4.00
7	S. platyclados	22.40	a	b	c	d	e			248	4.03
8	S. fallax	25.33		b	c	d	e	f		245	4.08
9	S. macroptera	25.75			c	d	e	f		244	4.10
10	Dipterocarpus sp	26.10			c	d	e	f	g	260	3.85
11	S. virescens	26.48			c	d	e	f	g	254	3.93
12	S. blumutensis	26.70			c	d	e	f	g	268	3.73
13	S. johorensis	27.45			c	d	e	f	g	251	3.98
14	S. cryso	28.08			c	d	e	f	g	251	3.98
15	S. guiso	28.30			c	d	e	f	g	261	3.83
16	S. scaberima	29.08				d	e	f	g	263	3.80
17	S. pinanga	29.10				d	e	f	g	242	4.13
18	S. ovalis	29.75					e	f	g	239	4.18
19	S. macrophylla	30.73						f	g	242	4.13
20	S. parvifolia	31.55						f	g	251	3.98
21	S. leprosula	31.55						f	g	251	3.98
22	S. smithiana	32.43						f	g	261	3.83
23	S. dasyphylla	33.53							g	254	3.93

Figure 5. Dendrogram from hierarchical clustering of dipterocarps species trial based on four characteristic traits (survival rate, DBH, PP and SWV).