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现介绍两种更新调查法,一种叫样方法,一种叫量距法。样方法是在热带林清查中实际使用的一个方法。因为在更新初期阶段,所用的样方恰巧是1/1,000(口畝)≈4m～2,所以这个方法多被人们叫做“千分(口畝)法”。以后随着幼苗逐渐长大,样方面积要扩大到四分之一链的平方(≈25m～2)和半链的平方(≈100m～2)。因为在更新调查时,这些样方几乎是排在直线系统上,而“直线系统”这个词的英文是“Line system”,所以就用英文缩写命名不同大小的样方:千分(口畝)
Now introduce two update investigation method, a kind of called method, a method called distance measurement. The sample method is a practical method of tropical forest inventory. Since the quadrat happens to be 1 / 1,000 (mu) ≈ 4m ~ 2 in the early stages of the update, this method is often referred to as the “thousand acre” method. Later, as the seedlings grow up, the area of quadrats should be expanded to the square of quarter chain (≈25m ~ 2) and the square of half chain (≈100m ~ 2). Because these quadrats are almost always aligned on a straight line system during the survey update, and the English term “linear system” is “Line system,” abbreviations are used to designate quadrats of different sizes: