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过去的伐区资源调查,是用全林实测方法进行的,在南方林区,因山高坡陡、地形复杂,此法工效很低。我们采用点抽样,以不同的测树方法,对伐区资源进行调查,从全林实测验证,取得了初步效果。一、试验方法我们在大青山林场白云分场的近期伐区中,机械地抽取了三个小班作试验。总面积16.98公顷。以一个小班为一个抽样总体,采用简单抽样方法,在同一个调查点上分别机械设置面积为O.01公顷的棱形样地,同时在棱形样地的中心点,进行角规样地、角规控制检尺样地、模拟样地和“象限”样地调查。(一) 样地数量。是根据调查小班的面
In the past, the investigation of cutting area resources was conducted by using the whole forest measurement method. In the southern part of the country, due to the steep mountain slope and the complicated terrain, the method is very inefficient. We use point sampling, with different methods of tree measurement, logging resources survey, from the whole forest test verification, and achieved initial results. First, the test method We Daqingshan forest field Baiyun sub-field recently cutting area, the mechanical extraction of three small classes for testing. The total area of 16.98 hectares. Taking a small class as a sample overall, a simple sampling method was used to set up a prism-shaped sample area of O.01 hectare at the same survey point. At the same time, at the center of the prismatic sample, Angle gauge control test plots, analog plots and “quadrant” sample survey. (A) the number of plots. It is based on the survey face of small class