Effects of fire severity on early recovery of Patagonian steppes
Effects of fire severity on early recovery of Patagonian steppes
复制标题
火灾严重程度对巴塔哥尼亚草原早期恢复的影响
DOI：
10.1071/wf12198
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
F. Oddi
中科院分区：
文献类型：
--
作者：
L. Ghermandi;S. Gonzalez;M. Lescano;F. Oddi
火灾的严重程度影响植物群落的恢复和生物多样性。我们比较了巴塔哥尼亚草原西北部两个地点（一处烧毁严重程度高，一处烧毁严重程度低）植物功能群的早期火灾后恢复情况。我们对火后土壤种子库以及地上植物物种的组成和覆盖度进行了采样，并计算了丰富度、多样性和外来物种的百分比。低火灾严重程度增加了地上植被和种子库的多样性，而高火灾严重程度减少了除逃亡物种外的所有功能群的覆盖范围。由于芽库死亡，多年生草本植物的分蘖产量下降。在种子库中，严重程度的火灾减少了逃逸物种并增加了外来物种。逃逸物种需要火来补充，火灾线索和火灾后环境条件的结合可以解释火灾后这些物种的高丰度。在巴塔哥尼亚，使用火不被视为一种管理选择，因为火被认为对人类、货物和服务造成危险。不过，巴塔哥尼亚西北部人烟稀少，频繁发生的山火并不构成危险。有必要增加对巴塔哥尼亚生态系统与火情和土地利用相关的生态过程的了解，以实现该地区可持续利用和保护之间的合理平衡。
Fire severity influences the recovery and biodiversity of plant communities. We compared the early post-fire recovery of plant functional groups in two sites (one burnt with high severity and one with low severity) in the north-western Patagonian steppe. We sampled the post-fire soil seed banks, as well as the composition and cover of aboveground plant species, and calculated richness, diversity and the percentage of exotic species. Low fire severity increased the diversity of aboveground vegetation and seed banks, whereas high fire severity reduced the cover of all functional groups, with the exception of fugitive species. Tiller production of perennial grasses decreased due to bud bank mortality. In the seed bank, high severity fire reduced fugitive species and increased exotic species. Fugitive species need fire to recruit, and the combination of fire cues and post-fire environmental conditions can explain the high abundance of these species after fire. In Patagonia, the use of fire is not considered a management option because fires are believed to be dangerous to humans, goods and services. However, north-western Patagonia is sparsely populated and the frequent wildfires pose no danger. It is necessary to increase the knowledge of the ecological processes of Patagonian ecosystems related to fire regime and land use, to achieve a reasonable balance between sustainable use and conservation in this region.