Forest Inventory Using Precision Forestry Techniques in Eucalyptus grandis Hill ex Maiden Stands

ABSTRACT This study aimed to determine the wood stock through systematic sampling and geoinformation technologies in order to elaborate maps of forest productivity as a forest post-stratification inventory. We positioned 24 plots of 625 m2 each ina distance of 70 m from each other. The yield map was generated after selecting a model for semivariogram adjustment between volumes in the plots. A 3,753.9 m3 total volume was estimated in the forest inventory through systematic sampling, while the yield map produced with precision forestry techniques showed a total volume of 3,768.9 m3. The analysis of variance showed that there is a significant difference between the means of the strata and based on this fact, the estimates were generated per stratum, then the total volume of 3,772.9 m3 was estimated. The precision forestry technique proved to be an efficient tool in the post-stratification of forest inventories.摘要 本研究旨在通过系统抽样（systematic sampling）与地理信息技术（geoinformation technologies）测定林木蓄积量，以绘制森林生产力图，作为森林后分层清查的实施手段。本次研究共设置24块面积为625㎡的样地，样地间间距为70米。在选取适用于样地材积的变异函数（semivariogram）拟合模型后，生成了材积产量图。通过系统抽样开展的森林清查估算总蓄积量为3753.9立方米，而基于精准林业（precision forestry）技术生成的材积产量图估算总蓄积量为3768.9立方米。方差分析（analysis of variance）结果显示，各分层的均值存在显著差异，据此我们按分层分别进行估算，最终得到总蓄积量为3772.9立方米。本研究证实，精准林业技术可作为森林清查后分层工作的高效工具。