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中点象限法是一种无样地抽样技术,在国外已广泛使用。国外学者认为,此法在发向完全的顶极群落中应用优于样方法;国内在发育比较完全的亚热带常绿阔叶林中使用,公认其精度高。我省大画积的天然次生林,多为发育不完全的常绿—落叶阔叶混交林,我们通过中点象限法与样方法(记数样方法)的对比调查,结果分析表明:中点象限法与样方法相比,精度和置信度接近,且效率高,易于施行。此法在种类繁多、结构复杂的次生林中是适用的,但必须注意选择适当的起测直径,才能达到高精度。
The quadrant quadrant method is a sample-free sampling technique that has been widely used abroad. Foreign scholars believe that this method is applied to the complete climax community better than the sample method; the more developed in the subtropical evergreen broad-leaved forest use, recognized its high accuracy. In our province, a large area of natural secondary forest is mostly underdeveloped evergreen-deciduous broad-leaved mixed forest. By comparing the quadrant quadrat method with the sample method (count-sample method), the results show that the midpoint quadrant Compared with the sample method, the accuracy and confidence are close, and the efficiency is high and easy to implement. This method is suitable for a large variety of complex secondary forests, but care must be taken to select the appropriate test diameter for high accuracy.