DOI: 10.1029/2018GB005978
论文题名: Has Submerged Vegetation Loss Altered Sediment Denitrification, N2O Production, and Denitrifying Microbial Communities in Subtropical Lakes?
作者: Liu W. ; Jiang X. ; Zhang Q. ; Li F. ; Liu G.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 8 语种: 英语
英文关键词: abiotic factor
; denitrification
; eutrophication
; gene expression
; lacustrine deposit
; macrophyte
; microbial community
; nitrogen oxides
; polymerase chain reaction
; submerged vegetation
; subtropical region
; China
学科: aquatic vegetation
; denitrification
; eutrophication
; functional genes
; shallow lakes
中文摘要: Loss of submerged vegetation has become one of the most serious ecological issues in shallow lakes worldwide. However, there is limited understanding of the effect of vegetation loss on sediment nitrogen (N) cycling processes and microbial communities, which are closely linked to the N removal function of aquatic ecosystems. Here we investigated the sediment denitrification and N2O production rates of 10 macrophyte-rich and 12 macrophyte-free lakes in subtropical China. We determined the abundance of diversity of nirS- and nirK-encoding denitrifiers in sediments using quantitative polymerase chain reaction and clone libraries. The results showed that denitrification and N2O production rates in vegetated lakes were slightly but not significantly lower than those in nonvegetated lakes. Sediment denitrification rates in vegetated lakes were positively correlated with water NO3 − concentration but not significantly related to submerged vegetation and denitrifier communities. Similarly, the presence of submerged macrophytes had no significant effect on denitrifier diversity and abundance. Water N content and sediment moisture were the main factors affecting the composition of denitrifying communities. Moreover, no significant correlation was found between community similarity and geographical distance among lakes. Overall, our findings suggest that submerged vegetation degradation in Yangtze lakes has no significant effect on sediment denitrification rates and denitrifying community structure. Abiotic factors, especially water N level and sediment moisture, play a critical role in controlling N removal capacity of lake sediments. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160208
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China; Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China
Recommended Citation:
Liu W.,Jiang X.,Zhang Q.,et al. Has Submerged Vegetation Loss Altered Sediment Denitrification, N2O Production, and Denitrifying Microbial Communities in Subtropical Lakes?[J]. Global Biogeochemical Cycles,2018-01-01,32(8)