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①以威斯康星州为例,说明美国林务局北中林业试验站的资源分析部门估测该州商品材资源的年消耗量及木材年产量的方法; ②如何应用复测固定样地的数据去估算两次调查间隔期内的年平均森林资源消耗量。同时将解释如何把这一消耗量分成两部分——木材生产性资源消耗和“其它消耗”; ③如何估测木材年产量和每年用于生产木材所消耗的森林资源蓄积。为作出这一估计量,需要进行三个相关的调查研究项目——初级制材厂调研,薪材和柱桩材调研及伐区资源利用调研。
(1) Take Wisconsin as an example to illustrate how the resource analysis department of the North Forest Experiment Station of the US Forest Service can estimate the annual consumption of timber resources and the annual timber production; (2) How to use the data of retest fixed plots Estimate annual average forest resource consumption over the two survey intervals. It will also explain how to split this consumption into two parts - productive timber consumption and “other consumption”; - how to estimate annual timber production and annual forest resource consumption for timber production. To make this estimate, three related investigations and studies are needed: primary material plant research, fuelwood and post pile research, and resource utilization studies of cutting areas.