POTENTIAL IMPACTS OF THE INVASIVE EXOTIC SHRUB RHAMNUS FRANGULA L. (GLOSSY BUCKTHORN) ON FORESTS OF SOUTHERN NEW HAMPSHIRE
POTENTIAL IMPACTS OF THE INVASIVE EXOTIC SHRUB RHAMNUS FRANGULA L. (GLOSSY BUCKTHORN) ON FORESTS OF SOUTHERN NEW HAMPSHIRE
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外来入侵灌木鼠李（Rhamnus frangula L.）对新罕布什尔州南部森林的潜在影响
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Thomas D. Lee
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作者：
B. Frappier;R. Eckert;Thomas D. Lee
摘要本文研究了外来灌木鼠李（Rhamnus frangula L.）（光泽沙棘）改变本土植物群落组成在东南部新罕布什尔州。采用分层随机抽样方法，在4个同龄阔叶混交林（其中3个为人工林）中，沿沿着3条50 m样带每隔5 m随机抽取2 m × 2 m样方。R. frangula和测量的物种丰度和环境变量进行了调查，采用线性，最小二乘多元回归和非度量多维尺度排序。绘制R的基底面积。鸡蛋花与木本植物密度（p < 0.001）、草本植物盖度（p < 0.05）和物种丰富度（p < 0.01）呈负相关。R.鸡蛋花对苗木密度变异的解释力大于林冠开度、土壤pH、土壤粘粒或土壤砂粒。R.对于所有研究地点，鸡蛋花是个体草本物种丰度的统计学显著预测因子（p < 0.05）。这一证据支持了R.鸡蛋花导致幼苗密度下降，并改变了本地地面植物物种的丰度。此外，该格局与R.在去除实验中发现的鸡蛋花。
Abstract This paper investigated the potential for the exotic shrub Rhamnus frangula L. (glossy buckthorn) to alter native plant community composition in southeastern New Hampshire. Stratified random sampling was performed with 2 m × 2 m plots randomly located in 5 m intervals along three 50 m transects in four even-aged Pinus-mixed hardwood forests, three of which were managed stands. The associations between R. frangula and the measured species abundances and environmental variables were investigated using linear, least-squares multiple regression and Non-metric Multidimensional Scaling Ordination. Plot basal area of R. frangula was inversely related to woody seedling density (p < 0.001), herb cover (p < 0.05), and species richness (p < 0.01). The relative contribution of R. frangula to explaining variance in seedling density was greater than canopy openness, soil pH, soil clay, or soil sand. Abundance of R. frangula was a statistically significant predictor (p < 0.05) of individual herb species abundances for all study sites. This evidence supports the hypothesis that R. frangula causes a decline in seedling density and alters native ground level plant species abundances. Furthermore, the patterns agree with the suppression of ground level plant species abundances by R. frangula found in removal experiments.