气候变化领域集成服务门户(CCPortal): Has Submerged Vegetation Loss Altered Sediment Denitrification, N2O Production, and Denitrifying Microbial Communities in Subtropical Lakes?

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DOI	10.1029/2018GB005978
	Has Submerged Vegetation Loss Altered Sediment Denitrification, N2O Production, and Denitrifying Microbial Communities in Subtropical Lakes?
	Liu W.; Jiang X.; Zhang Q.; Li F.; Liu G.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1195
结束页码	1207
卷号	32 期号:8
英文摘要	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.
英文关键词	aquatic vegetation; denitrification; eutrophication; functional genes; shallow lakes
语种	英语
scopus关键词	abiotic factor; denitrification; eutrophication; gene expression; lacustrine deposit; macrophyte; microbial community; nitrogen oxides; polymerase chain reaction; submerged vegetation; subtropical region; China
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129804
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
推荐引用方式 GB/T 7714	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],2018,32(8).
APA	Liu W.,Jiang X.,Zhang Q.,Li F.,&Liu G..(2018).Has Submerged Vegetation Loss Altered Sediment Denitrification, N2O Production, and Denitrifying Microbial Communities in Subtropical Lakes?.Global Biogeochemical Cycles,32(8).
MLA	Liu W.,et al."Has Submerged Vegetation Loss Altered Sediment Denitrification, N2O Production, and Denitrifying Microbial Communities in Subtropical Lakes?".Global Biogeochemical Cycles 32.8(2018).