Spotted Knapweed (Centaurea biebersteinii DC) Response to Forest Wildfires on the Bitterroot National Forest, Montana
Spotted Knapweed (Centaurea biebersteinii DC) Response to Forest Wildfires on the Bitterroot National Forest, Montana
复制标题
斑点矢车菊（Centaurea biebersteinii DC）对蒙大拿州比特鲁特国家森林森林火灾的反应
DOI：
10.3955/0029-344x-81.2.138
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Kate Zoe Schneider
中科院分区：
文献类型：
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作者：
D. Ferguson;C. L. Craig;Kate Zoe Schneider
2000年发生在蒙大拿州的比特根野火烧毁了比特根国家森林上124,250公顷的森林和牧场。由于斑点马尾草(Centaurea Biebersteinii DC)在比特罗特国家森林中很常见，因此野火过后，马尾草种群很有可能扩大。采用分层随机抽样的方法研究了森林植被在森林火灾后的发育过程。在焚烧后的5年时间里，共对71个林分的283块样地进行了三次测量。火烧后1~2年，19.4%的样地发生针叶杂草，26.1%的样地发生3a，37.1%的样地发生5a。花旗松的5年生发率较高。Gluca(Beissn.)[Franco]生境类型(56.0%)高于亚高山冷杉[Abies lasiucpa(Hook.)Nutt.]生境类型(9.6%)。火灾发生后，天牛花的发生和盖度与林地烧伤严重程度呈负相关；然而，随着时间的推移，烧伤程度越高，增加的速度越快。在烧伤严重程度较低的地块，金针草的盖度随着时间的推移而下降，而在烧伤程度较高的地块，随着时间的推移，天葵的盖度会增加。牛膝草在第3年首次出现的样地中最高，在第5年首次出现的样地中最短。总之，这些结果表明，植被恢复对减少牛膝草种群非常重要，特别是在道格拉斯-冷杉生境类型上。
The 2000 Bitterroot wildfires in Montana burned 124,250 ha of forest and rangelands on the Bitterroot National Forest. Because spotted knapweed (Centaurea biebersteinii DC) is common on the Bitterroot National Forest, there is a high potential of expanded knapweed populations following the wildfires. A stratified random sample was used to study forest vegetation development following the wildfires. A total of 283 plots in 71 stands were measured three times during the 5-year period after burning. Knapweed occurred on 19.4% of plots at 1 or 2 years postfire, 26.1% at 3 years, and 37.1% at 5 years. Occurrence at 5 years was higher on Douglas-fir [Pseudotsuga menziesii var. glauca (Beissn.) Franco] habitat types (56.0%) than on subalpine fir [Abies lasiocarpa (Hook.) Nutt.] habitat types (9.6%). Initially after the fire, occurrence and cover of knapweed were inversely correlated with forest floor burn severity; however, the rate of increase over time was higher at higher burn severities. Knapweed cover declined over time on plots with low burn severity and increased over time on plots with high burn severity. Knapweed was tallest on plots where it first occurred at year 3 and shortest where it first occurred at year 5. Collectively, these results suggest that vegetation recovery is important for reducing knapweed populations, especially on Douglas-fir habitat types.