The roles of environmental variation and spatial distance in explaining diversity and biogeography of soil denitrifying communities in remote Tibetan wetlands

Xiaoliang Jiang, Wenzhi Liu (Lead / Corresponding author), Lunguang Yao, Guihua Liu, Yuyi Yang (Lead / Corresponding author)

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The relative importance of local environments and dispersal limitation in shaping denitrifier community structure remains elusive. Here, we collected soils from 36 riverine, lacustrine and palustrine wetland sites on the remote Tibetan Plateau and characterized the soil denitrifier communities using high-throughput amplicon sequencing of the nirS and nirK genes. Results showed that the richness of nirS-type denitrifiers in riverine wetlands was significantly higher than that in lacustrine wetlands but not significantly different from that in palustrine wetlands. There was no clear distinction in nir community composition among the three kinds of wetlands. Irrespective of wetland type, the soil denitrification rate was positively related to the abundance, but not the α-diversity, of denitrifying communities. Soil moisture, carbon availability and soil temperature were the main determinants of diversity [operational taxonomic unit (OTU) number] and abundance of thenirS-type denitrifier community, while water total organic carbon, soil NO3- and soil moisture were important in controlling nirK-type denitrifier diversity and abundance. The nirS community composition was influenced by water electrical conductivity, soil temperature and water depth, while the nirK community composition was affected by soil electrical conductivity. Spatial distance explained more variation in the nirS community composition than in the nirK community composition. Our findings highlight the importance of both environmental filtering and spatial distance in explaining diversity and biogeography of soil nir communities in remote and relatively undisturbed wetlands.

Original languageEnglish
Article numberfiaa063
Pages (from-to)1-11
Number of pages11
JournalFEMS Microbiology Ecology
Volume96
Issue number5
Early online date10 Apr 2020
DOIs
Publication statusPublished - May 2020

Keywords

  • denitrification
  • marshes
  • nitrogen cycles
  • salt lakes
  • species richness

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