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确定森林群落最小调查面积的方法

, PP. 331-334

Keywords: 森林群落,最小面积,数学方法

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Abstract:

研究分析了来自中国、蒙古、缅甸、南非和德国的具有林木空间位置坐标和树种组成的试验地数据,提出了利用模型和数学手段确定森林群落最小面积的新方法。通过从样地中心设立方形样方并按10 m的间隔逐渐扩大样地边长并统计树种数的方法获取种2面积数据,并建立种2面积模型,令模型二阶导数为零或近似为零(1 ×10 -6 )来确定最小面积。研究还发现,最小面积和最大树种数的关系可用半对数模型很好描述,实践中可直接借助本研究所提出的模型用潜在的树种数来估计调查所需的最小面积。

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