A History of Fire and Vegetation in Northeastern Minnesota as Recorded in Lake Sediments
A History of Fire and Vegetation in Northeastern Minnesota as Recorded in Lake Sediments
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DOI：
10.1016/0033-5894(73)90004-5
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发表时间：
1973-10
影响因子：
2.3
通讯作者：
A. M. Swain
中科院分区：
文献类型：
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作者：
A. M. Swain
湖泊沉积物中的木炭记录表明，火灾一直是明尼苏达州东北部森林历史中的一个重要生态因素。云湖每年的层状沉积物可以精确测定木炭峰的年代，并记录各种花粉类型流入的变化。过去1000年的详细记录表明，火灾的平均频率约为60-70年，范围约为20-100年。沉积物中木炭的含量可追溯到 1000-500 年之间。尽管这两个时期的火灾频率没有明显不同，但始终高于过去 500 年。花粉分析显示，木炭峰值后主要花粉类型的百分比没有变化或仅出现短期变化。
The record of charcoal in lake sediments indicates that fire has always been an important ecological factor in the forest history of northeastern Minnesota. The annually laminated sediments of Lake of the Clouds permit precise dating of the charcoal peaks and record the changes in the influx of various pollen types. A detailed record of the past 1000 yr shows that the average frequency of fire is approximately 60–70 yr, with a range of about 20–100 yr. The amount of charcoal in sediments dating between 1000-500 y.a. is consistently higher than that for the last 500 yr, although the fire frequency for the two periods was not appreciably different. Pollen analysis shows no change or only short-term changes in the percentages of major pollen types following charcoal peaks.