聚集指数边界效应的校正方法与应用

Studies on Adjustment Approach and Its Application of Bounder Effect on Aggregation Index

采用全站仪对野外设置的临时标准地测定4 个角点的相对坐标值和每株树木的相对坐标值,根据数据的特点,提出了消除标准地边界效应计算聚集指数的方法,并利用此方法结合定位数据,对吉林蛟河东大坡自然保护区不同发育阶段的阔叶红松林群落中林木的空间分布格局进行分析。结果表明,该群落中先锋树种占相对优势的发育阶段,林木呈聚集分布;伴生树种占相对优势发育阶段和稳定群落阶段的林木则趋于随机分布。林木由聚集分布趋向随机分布,是阔叶红松林在发育过程中树种生物学特性、树种适应对策和干扰状况共同影响的结果。

There were many ways on bounder effect to obtain data. However, it used to led to computing error owing to affect of bounder effect in calculating aggregation index by the result which concluded by monitoring sample plot. Thus, adjusting bounder effect method was chosen to analysis spatial pattern of different growth period of broad-leaved Korean pine forest according to aggregation index to take a reasonable management step and biological control tactics.The whole station apparatus was used to monitor relative coordinate data of temporary sample plot in four corners and relative coordinate data of each tree in field. Meantime, the new approach on aggregation index to correct bounder effect was put forward to analysis the spatial distribution pattern of broad-leaved Korean pine forest in its different growth period. The results showed that the pioneer trees shaped clumped distribution pattern when they were dominant. Otherwise, the companion trees shaped random distribution pattern.It was the results that acted as tree biological characteristic, tree adaptive tactics and disturbance factors for broad-leaved Korean pine forest pattern change from clumped distribution pattern to random distribution pattern in its different growth period respectively.