在象片上可以判读和测定的林木因子有树种、树高、树冠郁闭度、树冠直径、立木株数和色调。而实际工作中用肉眼比较容易判读的因子有树种、树高和树冠郁闭度,用此三因子区划林相能够满足区划小班的要求,且树高和郁阴度与林分蓄积相关紧密。为此,这次试验调查采用这三因子进行林相区划。 Tree factors, tree height, canopy density, crown diameter, stand number and color tone can be interpreted and determined on the image. In practice, the factors that can be read by the naked eye are tree species, tree height and canopy density. Using these three factors to divide the forest facies can meet the requirements of zoning small classes, and the tree height and shade degree are closely related to the stock volume. To this end, the pilot survey using these three factors for forest division.