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

Figure 1

Location and description of survey sites. The four site maps indicate the location, length, and orientation of the track lines. *According to Greijmans and Inthavong [25]. IIa: mean temperature in coolest month, December <9°C, mean annual rainfall <2,000 mm and more than 3.5 dry months (mean monthly rainfall <40 mm). IIIa: mean temperature of coolest month, December 9°C–13°C, mean annual rainfall <2,000 mm and more than 3.5 dry months (mean monthly rainfall 40 mm).