监测阿拉斯加西南部哈格梅斯特岛过度放牧地衣群落的恢复情况

Rangifer Pub Date : 2021-01-14 DOI:10.7557/2.41.1.5340
Patrick B Walsh, T. Goward
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引用次数: 0

摘要

了解过度放牧地衣群落的恢复速度对北方地区土地管理者具有重要价值。本文描述了阿拉斯加哈格迈斯特岛(Hagemeister Island)驯鹿(Rangifer tarandus)过度放牧后12年期间的地衣群落组成和目前的恢复率测量。1993年,由于过度放牧,驯鹿被移出该岛,平均总地衣生物量从2003年的504.2 kg/ha (SD 205.4)增加到2015年的795.3 kg/ha (SD 489.6)。我们用三条竞争的生长曲线估计恢复时间,估计可放牧生物量可能在34-41年达到。然而,顶极生物量完全恢复的估算值在不同的模式之间存在差异,从71年到400年不等。2015年,地衣群落由至少78个地衣类群的不同混合组成,并以灌木藓属(Cladina stygia)和其他重要的驯鹿饲料种为主。虽然驯鹿过度放牧减少了牧草数量,但没有使首选牧草类群灭绝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Monitoring recovery of overgrazed lichen communities on Hagemeister Island, southwestern Alaska
Understanding the recovery rate of overgrazed lichen communities has value to mangers of lands in northern regions. We describe lichen community composition and present recovery rate measurements for a 12-year period following overgrazing by reindeer (Rangifer tarandus) on Hagemeister Island, Alaska. Reindeer were removed from the island in 1993 following overgrazing and average total lichen biomass increased from 504.2 kg/ha (SD 205.4) in 2003 to 795.3 (SD 489.6) in 2015. We estimate time to recovery with three competing growth curves which estimate grazeable biomass may be reached in 34-41 years. However, estimates of full recovery to climax biomass varied among the models, ranging from 71 to 400 years. In 2015, lichen communities were composed of various mixtures of at least 78 lichen taxa, and were dominated by Cladina stygia and other important reindeer forage species. While reindeer overgrazing diminished forage quantity, it did not extirpate preferred forage taxa.
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