在哥斯多黎加热带湿地林带,依照需要时间和精度比较了四种不同的清查方法。这些方法都是用非限制性随机抽样设计的,并且这四种方法的各个样地都用同一样地中心。这四种方法是:(a)在10×50米样地上调查所有胸径≥20厘米的树;(b)点抽样;(c)测定离样地中心最近的六株树;(d)测定10×50米样地上 In the tropical wetlands belt of Costa Rica, four different inventory methods were compared in terms of time and accuracy required. These methods are all designed with non-limiting random sampling, and each of these four methods uses the same center of gravity. The four methods are: (a) Investigating all trees with a diameter of 20 cm or more at a site of 10 × 50 m; (b) Spot sampling; (c) Determination of the six trees closest to the center of the sample site; × 50 meters like the ground