Arid
DOI10.1038/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
ISSN2045-2322
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
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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).
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