Assessing the Population Status of a Tree Species Using Distance Sampling: Aquilaria crassna (Thymelaeaceae) in Northern Laos

Table 1

Total number of detections (𝑁), encounter rate (km⁻¹) plus/minus standard error, and index of dispersion: Var(𝑛)/𝑛, where 𝑛 is number of objects detected per 50 m transect.

Site		Seedlings	Saplings	Standing trees DBH < 10 cm	Standing trees DBH ≥ 10 cm	All standing trees	Felled trees
1	𝑁	296	111	148	95	243	18
	Encounter rate (km^−1)	39.5±9.5	14.8±3.9	19.7±3.6	12.7±4.9	32.4±6.7	2.4±0.6
	Dispersion index	31.7	4.1	2.1	3.7	3.6	1.6
2	N	54	48	118	6	124	36
	Encounter rate (km^−1)	5.1±1.8	4.6±1.8	11.2±1.3	0.6±0.2	11.8±1.3	3.4±1.1
	Dispersion index	7.6	4.3	1.7	1.0	1.7	1.4
3	N	80	132	337	53	390	32
	Encounter rate (km^−1)	7.9±3.1	13.0±2.6	33.2±10.4	5.2±1.2	38.4±11.3	3.2±1.2
	Dispersion index	7.6	3.9	21.3	5.0	25.0	1.7
4	N	159	135	135	13	148	65
	Encounter rate (km^−1)	17.3±10.4	14.7±2.3	14.7±2.5	1.4±0.4	16.1±2.6	7.1±1.7
	Dispersion index	30.8	2.1	1.8	0.9	1.7	1.9
All	𝑁	589	426	738	167	905	151