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本文应用“样方法”,“点——四分法”和“样线法”调查了亚热带森林植被,并在实践中提出了“点——线结合法”。通过比较分析证明此法在环境变化较大、植被结构比较复杂的亚热带森林调查中具有快速省时、操作简易、正确性大,人为主观因素影响较小的优点。“点——线结合法”调查乔木层时,样点间距以林木平均株行距的2.5倍为宜,样点数一般为15-20个;灌木层及草本层调查中,样线间距以该层中最大植物个体垂直于样线的最大宽度为宜,区段间距一般为3—5米。
In this paper, subtropical forest vegetation was investigated using “sample method”, “point-quarter method” and “sample line method”, and put forward “point-line combination method” in practice. Through comparative analysis, it is proved that this method has the advantages of fast time-saving, simple operation, large correctness and less influence of subjective human factors in the subtropical forest survey with large environmental changes and complicated vegetation structure. When the “point-line combination method” is used to survey the tree layer, the sample spacing is 2.5 times of the average tree line spacing, and the sampling points are generally 15-20. In the survey of shrub layer and herb layer, The largest plant in the vertical line perpendicular to the maximum width is appropriate, section spacing is generally 3-5 meters.