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在调查林分过往的状况及其变化时,固然可以根据有关调查报告和资料进行。然而能以提供客观情报的仍属航空象片。通过判读解析不同年份的象片,可望园满地掌握地物的变化。因此,现以发现明显衰退迹象的富士山麓山中地区的针枞(Picea Polita Carr)纯林株数变化调查为例,介绍航空象片调查林分变化的方法。山中针枞纯林概况山中针枞纯林面积56.67公顷,树令250-300年。它是由针枞侵入温带或亚热带针叶林,经过一段漫长时间而形成的纯林。作为珍贵天然群落于1963年列为天然纪念物。然而,近些年来针枞纯林发现急骤枯损,显著衰退的征兆。人们认为,直接的原因是强
In surveying the past status of the forest and its changes, although it can be based on the investigation report and information. However, aviation images can still be provided with objective information. By interpretation of the image of different years, is expected to grasp the change of terrain. Therefore, an investigation into the change of pure forest stand number of Picea Polita Carr in the Fuji mountainous area where a clear sign of decline is found is described. Pinnacle pure needle Hill Overview Pinus densiflora forest area of 56.67 hectares, tree order 250-300 years. It is invaded by needle fir temperate or subtropical coniferous forest, after a long period of time and the formation of pure forest. As a precious natural community in 1963 as a natural monument. However, in recent years, the needle-fir pure forest has witnessed a sharp decline and a sign of significant recession. People think that the direct reason is strong