...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>european journal of phycology >Ecology and diversity of rock-inhabiting cyanobacteria in tropical regions
【24h】

Ecology and diversity of rock-inhabiting cyanobacteria in tropical regions

机译：热带地区栖息在岩石上的蓝藻的生态学和多样性

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

摘要

The diversity and abundance of terrestrial, lithophytic cyanobacteria in tropical biomes and the variety of rock habitats which they occupy are discussed. The following results are presented in detail. Exposed rock surfaces on different continents and under different climatic conditions are occupied by a cosmopolitan, well-adapted, low-diversity microbial community dominated by cyanobacteria and cyanobacterial lichens. For inselbergs (isolated rock outcrops) in dry savanna, the ratio of rock covered by lichens to that covered by free cyanobacteria is approximately 5:3. In humid savannas this ratio is approximately 1:26, and in rainforests there are hardly any lichens on rocks. The primary production of epilithic communities, expressed as CO2fixed calculated from chlorophylla, can reach an annual 27 g m#x2212;2. When calculated for a hypothetical inselberg, production values for very dry thorn bush savanna, dry savanna and humid savanna are 1:3.2:4.2 on the basis of the entire inselberg, and 1:3.2:1.4 when calculated on a square metre basis (due to a larger area covered but lower productivity in the humid savanna). Biofilm communities are important in biogenic weathering and they enrich the soils surrounding the rocks with nitrogen.
机译：讨论了热带生物群落中陆生岩石蓝藻的多样性和丰度以及它们所占据的岩石生境的多样性。下面详细介绍了以下结果。在不同大陆和不同气候条件下裸露的岩石表面被一个以蓝藻和蓝藻地衣为主的世界性、适应性强、多样性低的微生物群落所占据。对于干燥稀树草原中的inselbergs（孤立的岩石露头），地衣覆盖的岩石与游离蓝藻覆盖的岩石比例约为5：3。在潮湿的稀树草原上，这个比例约为1：26，而在热带雨林中，岩石上几乎没有地衣。以叶绿素计算的CO2固定的表层群落的初级产量可达到每年27 g m−2。当计算假设的inselberg时，非常干燥的刺灌木稀树草原，干燥的稀树草原和潮湿的稀树草原的产量为1：3.2：4.2，以平方米计算的产量为1：3.2：1.4（由于潮湿稀树草原的覆盖面积较大但生产力较低）。生物膜群落在生物风化中很重要，它们用氮丰富了岩石周围的土壤。

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