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1984年省决定在韶关市十二个县开展森林资源二类调查。根据《广东省森林资源二类调查操作细则》规定,在进行小班调查的同时,对蓄积量在200万m~3以上的县进行群状抽样控制,并把样点,样木固定下来,建立县级连续清查体系。群状抽样调查适用于林地小块、分散的粤北集体林区,采用这种方法,缩短了外业调查时间,节省了调查经费,并达到了精度要求。1984年采用群状抽样调查,全市总蓄积量为5081万m~3,同1983年省级连续清查体系采用方形样地调查的结果4965万m~3比较,相差2.3%,各县的
In 1984, the province decided to conduct a second type of investigation of forest resources in 12 counties of Shaoguan City. According to the “Detailed Operational Guidelines for the Investigation of Forest Resources of the Second Category in Guangdong Province”, while conducting small-scale surveys, group sampling control was carried out on counties with a storage volume of over 2 million m 3 and the sampling points and sample trees were fixed and established County-level continuous inventory system. The group sampling survey is applied to small and scattered forest communities in northern Guangdong. By adopting this method, the time for field investigation is shortened, the investigation funding is saved, and the accuracy requirements are met. In 1984, using the group sample survey, the total volume of the city was 50.81 million m 3, a 2.3% difference from the result of 49.45 million m 3 in the quadrat sample survey conducted by the provincial-level continuous inventory system in 1983,