关键词: 截线抽样, 逆向截线抽样, 探测函数, 种群密度

Abstract: The line transect sampling method based on perpendicular distance is discussed here to estimate the abundance of wild-life population. Using the concept of detection function, several formulas on calculating density of population and it's sampling variance, depending on some different situations are given.Based on the principle of line transect sampling method,we have proposed a method to estimate abundance of wildlife population, called "Inverse line transect method".We illustrate this method using the data of dropping of red deer from Helan Mountain Natural Reserve Area and adopt the negative exponential density function as detection function.

Key words: Line transect sampling, Inverse 1ine transect sampling, Detection function, Density of population