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根据林业部的统一部署,江苏省于1979年建立了以省为总体的森林资源连续清查(初查)体系。这个体系是由固定样地、固定调查大队和固定调查生产队3个副总体组成。全省丘陵山区、国营林场及面积在300亩以上的平原带状或块状林,采用1×2公里网布点,称为第一副总体,除此以外的小片林业用地,采用固定调查大队,称为第二副总体,四旁树资源则采用固定调查生产队,称为第三副总体。全省林业用地面积及其精度由第一、二副总体联合计算,而蓄积及其精度则由三个副总体联合计算。样木检尺精度除固定样地中有一分地精确到0.1厘米外,其余部份和其他副总体则用2厘米一个径阶检尺。这一方案在当时的情况下是可行的。然而在事隔9年后的1988年,由于情况变化很大,如仍用上述方案进行复查就比较困难。因而有必要对一类清查方案进行一些改进。本文试就有关问题作如下浅析。
According to the unified plan of the Ministry of Forestry, Jiangsu Province established a system of continuous inventory (initial inspection) of forest resources with the province as a whole in 1979. This system consists of three sub-groups of fixed sample plots, fixed survey brigade and fixed survey production corps. The hilly mountainous areas, state-owned forest farms and plain belt-shaped or massive forests covering an area of 300 mu or above use a 1 × 2 km netting point as the first sub-population. In addition to the small-scale forestry land, a fixed investigation brigade, Known as the second deputy, the four sides of the tree resources are fixed survey production team, known as the third deputy overall. The province’s forestry land area and its accuracy by the first and second jointly calculated jointly, and the accumulation of precision and by the three vice president jointly calculated. Sample wood ruler precision in addition to a fixed sample of a precision to 0.1 cm, while the rest of the other sub-general is a diameter of 2 cm with a ruler. This scenario is feasible under the circumstances. However, in 1988 after 9 years, due to the large changes in circumstances, it would be more difficult to conduct a review if the above scheme is still used. Therefore, it is necessary to make some improvements to a type of inventory plan. This article tries to analyze the related problems as follows.