Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1038/s41598-018-25078-4 |
Namib Desert primary productivity is driven by cryptic microbial community N-fixation | |
Ramond, Jean-Baptiste1; Woodborne, Stephan2,3; Hall, Grant2; Seely, Mary4,5; Cowan, Don A.1 | |
通讯作者 | Ramond, Jean-Baptiste |
来源期刊 | SCIENTIFIC REPORTS
![]() |
ISSN | 2045-2322 |
出版年 | 2018 |
卷号 | 8 |
英文摘要 | Carbon exchange in drylands is typically low, but during significant rainfall events (wet anomalies) drylands act as a C sink. During these anomalies the limitation on C uptake switches from water to nitrogen. In the Namib Desert of southern Africa, the N inventory in soil organic matter available for mineralisation is insufficient to support the observed increase in primary productivity. The C4 grasses that flourish after rainfall events are not capable of N fixation, and so there is no clear mechanism for adequate N fixation in dryland ecosystems to support rapid C uptake. Here we demonstrate that N fixation by photoautotrophic hypolithic communities forms the basis for the N budget for plant productivity events in the Namib Desert. Stable N isotope (delta N-15) values of Namib Desert hypolithic biomass, and surface and subsurface soils were measured over 3 years across dune and gravel plain biotopes. Hypoliths showed significantly higher biomass and lower delta N-15 values than soil organic matter. The delta N-15 values of hypoliths approach the theoretical values for nitrogen fixation. Our results are strongly indicative that hypolithic communities are the foundation of productivity after rain events in the Namib Desert and are likely to play similar roles in other arid environments. |
类型 | Article |
语种 | 英语 |
国家 | South Africa ; Namibia |
收录类别 | SCI-E |
WOS记录号 | WOS:000431204500001 |
WOS关键词 | NITROGEN-FIXATION ; ECOSYSTEMS ; CARBON ; PHOTOSYNTHESIS ; ECOLOGY ; TERRESTRIAL ; DELTA-N-15 ; PLANTS ; CYCLE ; HOT |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/213067 |
作者单位 | 1.Univ Pretoria, GRI, Dept Biochem Genet & Microbiol, CMEG, Pretoria, South Africa; 2.Univ Pretoria, Mammal Res Inst, Pretoria, South Africa; 3.iThemba Labs, Johannesburg, South Africa; 4.Gobabeb Res & Training Ctr, Walvis Bay, Namibia; 5.Desert Res Fdn Namibia, Windhoek, Namibia |
推荐引用方式 GB/T 7714 | Ramond, Jean-Baptiste,Woodborne, Stephan,Hall, Grant,et al. Namib Desert primary productivity is driven by cryptic microbial community N-fixation[J],2018,8. |
APA | Ramond, Jean-Baptiste,Woodborne, Stephan,Hall, Grant,Seely, Mary,&Cowan, Don A..(2018).Namib Desert primary productivity is driven by cryptic microbial community N-fixation.SCIENTIFIC REPORTS,8. |
MLA | Ramond, Jean-Baptiste,et al."Namib Desert primary productivity is driven by cryptic microbial community N-fixation".SCIENTIFIC REPORTS 8(2018). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。