• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global change biology >Solar UV-B radiation affects below-ground parameters in a fen ecosystem in Tierra del Fuego, Argentina: implications of stratospheric ozone depletion
【24h】

Solar UV-B radiation affects below-ground parameters in a fen ecosystem in Tierra del Fuego, Argentina: implications of stratospheric ozone depletion

机译：太阳紫外线B辐射影响阿根廷火地岛芬生态系统的地下参数：平流层臭氧消耗的影响

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

Stratospheric ozone depletion caused by the release of chlorofluorocarbons is most pronounced at high latitudes, especially in the Southern Hemisphere (including the so-called 'ozone hole'). The consequent increase in solar ultraviolet-B radiation (UV-B, 280-315 nm) reaching the earth's surface may cause a variety of alterations in terrestrial ecosystems. Most effects might be expected to occur above-ground since sunlight does not penetrate effectively below-ground. Here, we demonstrate that solar UV-B radiation in a fen in Tierra del Fuego (Argentina), where the ozone hole passes overhead several times during the Austral spring, is causing large changes of below-ground processes of this ecosystem. During the third and fourth year of a manipulative field experiment, we investigated root systems in these plots and found that when the ambient solar UV-B radiation was substantially reduced, there was a 30% increase in summer root length production and as much as a threefold decrease in already low symbiotic mycorrhizal colonization frequency of the roots compared with plots receiving near-ambient solar UV-B. There was also an apparent shift toward older age classes of roots under reduced solar UV-B. Such large changes in root system behaviour may have decided effects on competition and other ecological interactions in this ecosystem.
机译：由氯氟烃释放引起的平流层臭氧消耗在高纬度地区最为明显，特别是在南半球（包括所谓的“臭氧洞”）中。到达地球表面的太阳紫外线B辐射（280-315 nm）的随之增加可能会导致陆地生态系统发生各种变化。由于阳光不能有效地渗透到地下，因此大多数影响都可能发生在地面上。在这里，我们证明了在阿根廷火地岛（Tierra del Fuego）（阿根廷）的一个中的太阳UV-B辐射，在南方春季，臭氧空洞几次在头顶上方通过，正在引起该生态系统地下过程的巨大变化。在进行操作性田间试验的第三年和第四年，我们调查了这些田间的根系，发现当环境紫外线B辐射大大降低时，夏季根长产生量增加了30％，最多可增加与已经接受近太阳紫外线B的地块相比，已经很低的根的共生菌根定植频率降低了三倍。在减少的太阳紫外线-B的作用下，根系也朝着年龄更大的根系转移。根系行为的如此大的变化可能对该生态系统中的竞争和其他生态相互作用产生决定性的影响。

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