黄河三角洲人工刺槐林枯梢调查统计分析

在野外样地调查数据的基础上,对黄河三角洲人工刺槐枯梢特征进行了统计分析,结果表明:研究地区人工刺槐林断顶、枯梢及死亡率为41.4%。依据样地树高和胸径调查数据,将239棵人工刺槐分为三类,调查表明,随着树龄的增加人工刺槐枯梢率由18.2%上升到36.3%,该地区人工刺槐枯梢程度服从(4.04,2.27)的正态分布,中度、重度和死亡刺槐占枯梢及死亡刺槐的66.7%,这表明黄河三角洲人工刺槐枯梢严重,需要及时进行人工刺槐林枯梢监测相关机理研究与综合管理。

Statistic Analysis on Planted Robinia Pseudoacacia Forest Dieback in the Yellow River Delta

On the basis of field plot survey data,characteristics of planted Robinia pseudoacacia forest dieback were statistically analyzed.The results showed that total dieback or dead ratio of planted Robinia pseudoacacia forest was 41.4%.According to tree height and breast diameter data,239 Robinia pseudoacacia trees were classified into three classes,which indicated the dieback ratio increased from 18.2% to 36.3% with tree age.The dieback degree matched normal distribution with parameters of(4.04,2.27),and moderate and severe dieback and dead Robinia pseudoacacia was 66.7 percent of all dieback and dead Robinia pseudoacacia,which indicated that the planted Robinia pseudoacacia forest in the Yellow River Delta was in the status of severe dieback,and needed monitoring of the dieback status and the mechanism needed to be studied and managed synthetically.