...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The response of vegetation cover and dune activity to rainfall, drought and fire observed by multitemporal satellite imagery
【24h】

The response of vegetation cover and dune activity to rainfall, drought and fire observed by multitemporal satellite imagery

机译：植被覆盖和沙丘活动降雨，干旱和火灾的响应，观察多型卫星图像观察

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The stable longitudinal dunes in the northern Simpson Desert, Australia, were observed in satellite imagery to become more active after vegetation cover was reduced by fire and drought. Subsequent rainfall events also resulted in significant vegetation regrowth and dune stabilization. These switches between more active and stable conditions have not been previously described in the largely vegetated dune fields of central Australia. The observations, made on 12 dune sites, relied on high spatial resolution satellite imagery to observe dune crest activity, and seasonal Landsat fractional cover imagery to observe vegetation cover changes. The non-photosynthetic vegetation (NPV) component of the fractional vegetation cover images revealed significant changes in hummock grass cover on the dunes between 1988 and 2018, with a positive relationship with the three-year cumulative rainfall, disrupted by two periods of patchy burning. Only those sites that had burnt became active, and only after vegetation cover had remained low (NPV < 16%) during the 'Millennium Drought'. There is no threshold in vegetation cover, below which dune crests become active, but active dune features require four-years of low NPV cover (< 16%) to develop. The large rainfall event that ended the drought increased NPV cover, stabilizing the dunes. Similar hummock grass covered dunes are present across large areas of the arid zone, and are likely to respond in similar ways, given that fire and drought are common occurrences in Australia. (c) 2019 John Wiley & Sons, Ltd.
机译：在澳大利亚北部辛普森沙漠稳定的纵向沙丘，在卫星图像中观察到植被覆盖通过火灾和干旱减少后变得更加活跃。随后的降雨事件也导致了显着的植被再生和沙丘稳定。这些开关在澳大利亚中部的主要植被的沙丘领域之前尚未描述。在12个沙丘网站上制作的观察依赖于高空间分辨率卫星图像，观察沙丘嵴活动，以及季节性土地分数封面图像，以观察植被覆盖变化。分数植被覆盖图像的非光合植被（NPV）组件在1988年至2018年间沙丘上显示了木头草覆盖的显着变化，与三年累计降雨的阳性关系，被两次斑斑的燃烧中断。只有那些已经烧焦的网站变得活跃，只有在“千年干旱”期间植被覆盖仍然低（NPV <16％）。植被覆盖的阈值，Dune Crests变得活跃，但活跃的沙丘特征需要四年的低NPV覆盖（<16％）来发展。结束干旱的大雨事件增加了NPV盖，稳定了沙丘。与澳大利亚的普通出现在澳大利亚的普通出现时，类似的小型木材覆盖的沙丘存在于干旱区的大面积上，并且可能以类似的方式回应。 （c）2019 John Wiley＆Sons，Ltd。

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