Pedosphere 30(6): 801--809, 2020
ISSN 1002-0160/CN 32-1315/P
©2020 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Driving factors of soluble organic nitrogen dynamics in paddy soils: Structure equation modeling analysis
Jing YANG1, Wenhao YANG1,2, Fan WANG3, Liming ZHANG1,2, Biqing ZHOU1,2, Rubab SARFRAZ1, Shihe XING1,2
1College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002(China)
2University Key Laboratory of Soil Ecosystem Health and Regulation in Fujian, Fuzhou 350002(China)
3School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen 518000(China)
ABSTRACT
      Soil soluble organic nitrogen (SON) is one of the most active components in soil nitrogen pools; however, limited information is available with regard to its driving factors, as well as their pathways and degrees of influence. In this study, structural equation modeling was used to analyze the driving factors, their significance, and pathways that affected SON dynamics in a waterlogged experiment of two typical paddy soils incubated for 80 d after green manure application. Soil pH, Eh, microbial biomass, enzyme activity, and SON dynamics were used to construct the structural equation model. Results showed that soil microbial biomass carbon (MBC), protease, glutamine, and initial organic matter (OM) directly and significantly affected soil SON with path coefficients corresponding to 0.405, 0.547, 0.523, and -0.623 (P < 0.01), respectively. Soil microbial biomass carbon and initial OM affected the SON dynamics indirectly through protease and glutamine activity. In addition, pH indirectly affected SON dynamics by glutamine activity. It is implied that soil MBC, protease, glutamine, and initial OM are the key factors affecting SON dynamics in the waterlogged paddy soils after green manure application. Our research indicated that structural equation modeling could provide an effective method to clearly recognize the impact, significance, and pathways of multiple factors on SON dynamics in paddy soils.
Key Words:  enzyme activities,green manure,pathways,soil microbial biomass,soil properties,waterlogged soil
Citation: Yang J, Yang W H, Wang F, Zhang L M, Zhou B Q, Sarfraz R, Xing S H. 2020. Driving factor of soluble organic nitrogen dynamics in paddy soils:Structure equation modeling analysis. Pedosphere. 30(6):801-809.
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