[1]LIU Gengyuan,XIAO Jie,GAO Mingxia,et al.Effect of Long-Term Fertilization on nirS-Type Denitrifer and Its Relationship with N2O Emission in Eum-Orthic Anthrosols[J].Research of Soil and Water Conservation,2022,29(02):99-105.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 02
Page number:
99-105
Column:
Public date:
2022-03-20
- Title:
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Effect of Long-Term Fertilization on nirS-Type Denitrifer and Its Relationship with N2O Emission in Eum-Orthic Anthrosols
- Author(s):
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LIU Gengyuan1, XIAO Jie1, GAO Mingxia2, SUN Benhua1,4, ZHANG Shulan1, YANG Xueyun1, FENG Hao2,3,4, ZHANG Tongxun1
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(1.College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and Agro-Environment, Ministry of Agriculture, Yangling,Shaanxi712100,China; 2.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi712100,China; 3.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi712100,China; 4.Institute of Water Saving Agriculture in Arid Region of China, Yangling, Shaanxi712100,China)
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- Keywords:
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long-term fertilization; nirS-type denitrifier; nitrous oxide; quantitative real-time PCR; high-throughput sequencing
- CLC:
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X144; X172
- DOI:
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- Abstract:
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Soil denitrification is an important process for the production of soil N2O, and that Nitrite reductase(NIR)catalyzes the reduction of nitrite nitrogen(NO-2)to nitric oxide(NO)is the key step of denitrification. The study on the impact of long-term fertilization on denitrifying microorganisms and its relationship with soil N2O emissions is of great significance for a comprehensive understanding of the soil denitrification process. Based on 28 years of long-term fertilization experiments in rain-fed dry farming system, the characteristics of soil nirS-type denitrifying bacterial communities and N2O emission and their relationship were investigated under different types of long-term fertilization(No fertilization of CK, only N fertilization and NK combined fertilization of partial fertilizations, and balanced fertilization of NPK)by conventional monitoring, quantitative PCR and high-throughput sequencing. The results showed that all types of long-term fertilization(N, NK and NPK)significantly increased the cumulative N2O emission(EN2O), in which balanced fertilization(NPK)caused the the highest cumulative N2O emission; long-term fertilization had no significant effect on nirS gene abundance and the α-diversity of nirS-type denitrifying bacteria, while long-term balanced fertilization increased the relative abundance of uncultured_bacterium_2303 and Rhodanobacter_sp._D206a, and reduced the relative abundance of unclassified_k_norank_d_Bacteria and unclassified_p_Proteobacteria, thereby changed the community structure of nirS-type denitrifying bacteria. Soil properties such as soil organic carbon, total nitrogen, available phosphorusand pH are the main factors influencing the nirS-type denitrifying bacterial community structure that has a significant effect on soil N2O emission, while the abundance of nirS gene abundance and the diversity of nirS-type denitrifying bacteria have no significant effects in Eum-Orthic Anthrosols under rain-fed dry farming system.