摘要
利用角尺度法分析了天然红松阔叶林林木个体的空间分布格局,采用数学模型对抽样点数与对应林木空间分布格局吻合率的关系进行拟合,将拟合方程二阶导数开始趋近于0的点对应的样点数确定为林木空间分布格局抽样调查的最小样本量,并利用9块模拟样地及2块厄瓜多尔天然林样地的资料进行分析,进一步求证最小样本量的合理性。结果表明,天然红松阔叶林空间分布格局调查的最小样本量为49。
Angle index was used to identify tree spatial distribution patterns of natural Korean pine broad-leaved forest, while models were employed to fit the relationships between the number of sampling points and probabilities that the identified tree spatial patterns coincide with the actuality, and then the number of sampling points at which the secondary derivatives of the fitted equations began to approach 0 was determined as the minimum sample for spot checking tree spatial distribution patterns of this forest. To further validate the rationality of the minimum sample, data from 9 simulated plots and 2 Ecuador natural forest plots were also analyzed. It showed that the minimum sample for spot checking tree spatial distribution patterns of natural Korean pine broad leaved forest should be 49.
出处
《林业科学研究》
CSCD
北大核心
2007年第2期160-164,共5页
Forest Research
基金
国家林业局948项目"林分计算机模拟技术引进"
关键词
天然红松阔叶混交林
空间结构
角尺度
二阶导数
natural Korean pine broad-leaved forest
spatial structure
angle index
secondary derivative
