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dc.contributor.authorXiao, D
dc.contributor.authorTan, Y
dc.contributor.authorLiu, X
dc.contributor.authorYang, R
dc.contributor.authorZhang, W
dc.contributor.authorHe, X
dc.contributor.authorXu, Z
dc.contributor.authorWang, K
dc.date.accessioned2019-11-27T03:32:18Z
dc.date.available2019-11-27T03:32:18Z
dc.date.issued2020
dc.identifier.issn0167-8809
dc.identifier.doi10.1016/j.agee.2019.106707
dc.identifier.urihttp://hdl.handle.net/10072/389345
dc.description.abstractDiazotrophs have potential for fixing atmospheric nitrogen (N) in terrestrial ecosystems. The effects of legumes on free-living N-fixing diazotrophs in the karst grassland were determined to provide a basis for ecosystem restoration. In a field experiment, diazotroph responses were examined in five treatments: control, low, and high densities of Amorpha fruticosa and Indigofera atropurpurea. The abundance and community composition of diazotrophs were significantly affected by sampling time and the interaction between different leguminous shrubs and planting density. Legume treatments significantly increased diazotroph abundance compared with the control in December (non-growing season). Greater N input with I. atropurpurea at high density in July (growing season) may suppress soil free-living N-fixing bacteria by decreasing diazotroph abundance. Diazotroph diversity was highest under I. atropurpurea in July. Phyllobacteriaceae and Beijerinckiaceae were abundant in the A. fruticosa plots, while Burkholderiaceae, Comamonadaceae, and Geobacteraceae were abundant in the I. atropurpurea plots. Regardless of the treatments, dissolved organic carbon was the key factor driving seasonal changes in diazotroph abundance and community composition. It suggests seasonal changes in temperature and soil moisture that drive nutrient availability (e.g., ammonium N and nitrate N) under planting legumes may explain the variation in diazotroph communities. Legumes reduced negative interactions among the species in network analyses. These findings suggest that increasing N availability by legume N fixation reduced inter-specific competition among the diazotrophs, with essential roles of rare taxa during the restoration of degraded lands in the karst region.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeNetherlands
dc.relation.ispartofpagefrom106707: 1
dc.relation.ispartofpageto106707: 10
dc.relation.ispartofjournalAgriculture, Ecosystems and Environment
dc.relation.ispartofvolume288
dc.subject.fieldofresearchAgriculture, Land and Farm Management
dc.subject.fieldofresearchEnvironmental Sciences
dc.subject.fieldofresearchAgricultural and Veterinary Sciences
dc.subject.fieldofresearchStudies in Human Society
dc.subject.fieldofresearchcode0701
dc.subject.fieldofresearchcode05
dc.subject.fieldofresearchcode07
dc.subject.fieldofresearchcode16
dc.titleResponses of soil diazotrophs to legume species and density in a karst grassland, southwest China
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationXiao, D; Tan, Y; Liu, X; Yang, R; Zhang, W; He, X; Xu, Z; Wang, K, Responses of soil diazotrophs to legume species and density in a karst grassland, southwest China, Agriculture, Ecosystems and Environment, 2020, 288, pp. 106707: 1-106707: 10
dc.date.updated2019-11-18T01:04:47Z
gro.hasfulltextNo Full Text
gro.griffith.authorXu, Zhihong


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