基于多边形法的森林资源调查监测

Investigation and Monitoring of Forest Resources Based on Polygonal Sample Plot Method

运用高精度南方NTS-960R型免棱镜全站仪,结合多边形样地森林资源调查方法,对赤峰市旺业甸林场200块标准地进行调查。选取4块有代表性的标准地,对标准地每木进行胸径和树高测量,将多边形样地法数据与样地每木检尺数据比较分析。结果表明：多边形样地法调查面积和调查株数不固定,每个样地的面积在0.005-0.015 hm2,树木6-9棵,外业工作量相对于标准样地法小;多边形样地法在天然林和混交林中的精度低,在单层林和人工林中的精度高;随着样地数量增加,精度逐渐提高,在天然林中,精度可达到85%以上,可适用于二类调查;在人工林中,精度可达到95%以上,可适用于三类调查。将多边形样地进行固定,可实时对林分生长量进行监测。

By choosing four representative plots from Wangyedian Forest Farm, Chifeng City, we measured the DBH and height of each tree with a total of 200 standard plots and collecting the data in the field surveying by using high-precision NP total station NTS-960R. We compared and analyzed the data collected from polygon plot, and the polygon plot method was not fixed about survey area and the number of trees. The area of every sample plot was about 0.005-0.015 ha, the numbers were about 6-9, and the workload in the field surveying was much more less than standard sample. The precision stability of separate polygon method was low in the natural forest and mixed forest, while it was high in the regular forest and plantation. With the increasing of sample plots, the precision stability greatly improved and it would be able to reach more than 85% in the natural forest and plantation, and could be applicable in the second class survey. The precision would be up to 95% in the plantation and could be applicable in the third class survey. Making the polygon sample plots fixed could monitor the stand increment in real time.