探讨利用航空象片信息估测小班调查因子的方法

TO ESTIMATE THE FACTORS OF STAND BY PHOTO INTERPRETATION

利用航空象片信息提取小班调查因子。首先利用航片对每个小班的林分类型、龄组、郁闭度和最大冠幅进行判读;其次根据以往的资料,建立林木株数分布,每公顷株数预测,直径与最大冠幅及胸径与树高、年龄等相关模型;最后由判读因子和上述模型借助于计算机求出林分蓄积量、断面积、各径阶株数,平均直径、平均高、平均年龄等因子。该试验是在我国北方次生林区进行的,多数小班因子可由航片提取,蓄积量估测的精度达到85％以上,可提高工作效率1—2倍。为我国二类森林调查提出了一种新的方法。

This paper obtains the factors of stand by photo interpretation. First, stand type, age group,canopy density and maximum crown diameter of each stand are obtained by interpreting the aerophotograph; second using the exisiting information to develop number of tree distribution model, number of trees per hectare model, model of diameter and maximum crown diameter, and diameter at breast model, finally, according to the photointering results and above models, stand volume, basal aera, number of trees per diameter class, mean diameter, mean height and mean age etc. are calculated with computer. The study is done in typical secondary forest of North in China. Most of the factors can be obtained from acrophoto graph automatically. The estimating precision of volume is higher than 85％, and will raise the labour efficiency by 1-2 times,and it also provides a new method for the management volume inventory in China.