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平原地区造林,特别是速生用材林,株行距非常规整。以圆形样地为单元,抽样调查林分蓄积量,常因立木实际占地面积与在圆形样地中占地面积差异较大而使估计值出现不易克服的偏差。为模索适于株行距规整的林分,特别是速生用材林小班蓄积量调查的抽样方法,笔者进行了初步研究,设计了几种栽植点单元抽样调查方法(简称栽植点抽样,下同),并进行了实地检验。现将结果初报于下。
Afforestation in the plains area, especially for fast-growing Timber Forest, the spacing between rows is irregular. Taking the circular sample plots as unit, sampling the volume of stand volume is often difficult to overcome due to the difference between the actual area occupied by standing stumps and the area occupied in the round sample plots. In order to find a suitable sampling method for surveying forest stand spacing, especially for small-scale stands of fast-growing timber, the author conducted a preliminary study and designed several sampling methods for planting sites (referred to as planting spot sampling, the same below) Conducted a field test. The results are reported below.