Pre-logging Treatment of Invasive Glossy Buckthorn (Frangula alnus Mill.) Promotes Regeneration of Eastern White Pine (Pinus strobus L.)
Pre-logging Treatment of Invasive Glossy Buckthorn (Frangula alnus Mill.) Promotes Regeneration of Eastern White Pine (Pinus strobus L.)
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入侵性光泽沙棘 (Frangula alnus Mill.) 的采伐前处理促进东部白松 (Pinus strobus L.) 的再生
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发表时间：
2016
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通讯作者：
I. Gaudreau
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作者：
Thomas D. Lee;Stephen E. Eisenhaure;I. Gaudreau
非原产光果沙棘（Frangula alnus Mill.）在美国东北部的森林中是入侵性的，但很少有人知道它对树木再生的影响。我们测试了在采伐前杀死沙棘茎是否会减少其采伐后的丰度，并增加东部白松（白松）的密度和高度。幼苗三个0.4公顷的地块被皆伐，三个被间伐，三个被留作对照。每个地块以前被分成三个子地块，在伐木前的两年内接受不同的沙棘处理。沙棘处理为（1）基部切茎5次;（2）切茎1次，然后热杀4次;（3）未处理的对照。采伐后三年，沙棘密度和茎高不受采伐，但同样减少了两个沙棘治疗。减少沙棘采伐量可增加松苗密度和苗高，且随采伐量的增加苗高也增加。在伐木后的第五年，松树的高度增长和生物量均大于在皆伐比在减薄处理，更大的地区，沙棘去除，并在处理小区内，更大的地区，沙棘密度低，比在灌木丛中恢复沙棘。因此，虽然沙棘抑制再生松，砍伐前破坏沙棘茎减少了至少四年的竞争。
Non-native glossy buckthorn (Frangula alnus Mill.) is invasive in forests of the northeastern USA but little is known of its effects on tree regeneration. We tested whether killing buckthorn stems before logging reduces its post-logging abundance and increases the density and height of eastern white pine (Pinus strobus L.) seedlings. Three 0.4 ha plots were clearcut, three were thinned, and three were left as controls. Each plot had previously been divided into three subplots that received different buckthorn treatments during the two years before logging. Buckthorn treatments were (1) stems cut at base five times; (2) stems cut once then heat killed four times; (3) untreated control. Three years post-logging, buckthorn density and stem height were unaffected by logging but equally reduced by the two buckthorn treatments. Buckthorn reduction increased density and height of pine seedlings, and seedling height also increased with logging. In the fifth year post-logging, pine height growth and biomass were greater in clearcut than in thinned treatments, greater in areas of buckthorn removal and, within treated subplots, greater in areas with low buckthorn density than in thickets of recovering buckthorn. Thus, although buckthorn inhibited regenerating pine, pre-logging destruction of buckthorn stems reduced such competition for at least four years.