• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Open Ecology Journal >Effects of Fire and Commercial Thinning on Future Habitat of theNorthern Spotted Owl
【24h】

Effects of Fire and Commercial Thinning on Future Habitat of theNorthern Spotted Owl

机译：火灾和商业间伐对北方斑点猫头鹰未来栖息地的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Northern Spotted Owl (Strix occidentalis caurina) is an emblematic, threatened raptor associated withdense, late-successional forests in the Pacific Northwest, USA. Concerns over high-severity fire and reduced timberharvesting have led to programs to commercially thin forests, and this may occur within habitat designated as a€?criticala€?for spotted owls. However, thinning is only allowed under the U.S. Government spotted owl guidelines if the long-termbenefits clearly outweigh adverse impacts. This possibility remains uncertain. Adverse impacts from commercial thinningmay be caused by removal of key habitat elements and creation of forests that are more open than those likely to beoccupied by spotted owls. Benefits of thinning may accrue through reduction in high-severity fire, yet whether the firereductionbenefits accrue faster than the adverse impacts of reduced late-successional habitat from thinning remains anuntested hypothesis. We found that rotations of severe fire (the time required for high-severity fire to burn an area equal tothe area of interest once) in spotted owl habitat since 1996, the earliest date we could use, were 362 and 913 years for thetwo regions of interest: the Klamath and dry Cascades. Using empirical data, we calculated the future amount of spottedowl habitat that may be maintained with these rates of high-severity fire and ongoing forest regrowth rates with andwithout commercial thinning. Over 40 years, habitat loss would be far greater than with no thinning because, under aa€?best casea€? scenario, thinning reduced 3.4 and 6.0 times more dense, late-successional forest than it prevented fromburning in high-severity fire in the Klamath and dry Cascades, respectively. Even if rates of fire increase substantially, therequirement that the long-term benefits of commercial thinning clearly outweigh adverse impacts is not attainable withcommercial thinning in spotted owl habitat. It is also becoming increasingly recognized that exclusion of high-severityfire may not benefit spotted owls in areas where owls evolved with reoccurring fires in the landscape.
机译：北部斑点猫头鹰（Strix occidentalis caurina）是一种象征性的，受威胁的猛禽，与美国西北太平洋的密集，后期成功森林有关。对高强度火灾和减少木材采伐的担忧导致了对商业化森林的计划，这可能发生在被指定为斑critical的关键栖息地内。但是，只有在长期利益明显大于不利影响的情况下，才可以根据美国政府的斑点猫头鹰准则进行减薄。这种可能性仍然不确定。商业性伐木的不利影响可能是由于主要栖息地元素的去除和森林的开垦（比斑点猫头鹰可能占用的森林更开放）引起的。稀疏化的好处可能通过减少高强度火灾而获得，但是减少火灾的收益是否比稀疏化导致的后期成功栖息地减少所产生的不利影响要快。我们发现，自1996年以来（我们可以使用的最早日期）开始，斑点猫头鹰栖息地的剧烈火灾（高烈度火灾燃烧一次等于关注区域的时间所需的时间）的轮换时间是362年和913年。兴趣：克拉马斯和干喀斯喀特。使用经验数据，我们计算了这些高强度火灾发生率和持续的森林再生率（无论是否进行商业放牧）都可以维持的斑点猫头鹰栖息地的未来数量。在40多年来，栖息地的损失将远远大于不减少的情况，因为在最好的情况下，在这种情况下，间伐减少了比在克拉马斯和干燥喀斯喀特地区因高强度火灾而无法燃烧的密度高的后期成功森林的数量分别增加了3.4倍和6.0倍。即使火灾发生率大大提高，但要求在稀有猫头鹰栖息地进行商业性伐木仍无法实现商业性伐木的长期利益明显大于不利影响。人们也越来越认识到，排除高强度火可能不会使猫头鹰在景观中反复发生火而演变的地区受益。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号