淹水对辣椒连作土壤化学性质与微生物群落结构的影响

doi:10.3864/j.issn.0578-1752.2022.12.017

Abstract

Abstract:

【Objective】This paper aimed to clarify the effect of farmland flooding on the soil environment of continuous pepper cropping, and to provide the technical basis for reducing the soil sickness caused by continuous pepper cropping. 【Method】In this experiment, the flooded and non-flooded soil of continuous cropped pepper in Hexian County of Anhui Province were analyzed, with non-flooded soil as control. The determination of chemical property and microbial community structure in soil with flowing analyser, qPCRand Illumina MiSeq sequencing explored the effect of flooding on the soil. Besides, the pepper was used as plant material to explore the effects of flooded and non-flooded soil on seed germination and seedling growth by the Petri dish method. 【Result】Soil flooding significantly decreased the soil EC value, organic matter, nitrate N, ammonium N, available K, and Olsen P. Quantitative PCR analysis showed that soil flooding significantly increased the bacterial community abundance (P<0.05), however decreased that of the fungal communities. Illumina MiSeq sequencing showed that the soil flooding significantly increased the relative abundances of Actinobacteria and Myxococcota, which decreased the Firmicutes and Mortierellomycota at phylum level. The soil flooding decreased the relative abundance of potential pathogenic fungi, such as Fusarium spp., positive correlation with nitrate N. The soil flooding increased potential Azotobacter, including Azoarcus, Gemmatimonas, Sideroxydans, Candidatus_Solibacter, Bryobacter, Sideroxydans spp. and plant-beneficial potential such as Aspergillus and Acremonium spp., which were negatively correlated with nitrate N. The soil microbial community structure and composition was significantly affected by soil nitrate N. In petri dish, the seed germination rate, seeding fresh weight and root length of peppers planted in flooded soil were significantly higher than those in non-flooded soil. 【Conclusion】Soil flooding significantly reduced the EC value and abundance of potentially pathogenic microbial community and increased the abundance of potentially beneficial bacterial, but significantly reduced the content of available nutrients. At the same time, Soil flooding was conducive to the seed germination and seedling growth and alleviated the pepper continuous cropping obstacles.

Key words: pepper continuous cropping, soil chemical properties, soil microbial community structure, soil microbial community composition, seedling growth

GONG XiaoYa,SHI JiBo,FANG Ling,FANG YaPeng,WU FengZhi. Effects of Flooding on Soil Chemical Properties and Microbial Community Composition on Farmland of Continuous Cropped Pepper[J].Scientia Agricultura Sinica, 2022, 55(12): 2472-2484.

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References 52

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	pH	EC值 EC value (mS∙cm^-1)	有机质 Organic matter (g∙kg^-1)	铵态氮 Ammonium N (mg∙kg^-1)	硝态氮 Nitrate N (mg∙kg^-1)	有效磷 Olsen P (mg∙kg^-1)	速效钾 Available K (mg∙kg^-1)
未淹水 Non-flooded	6.13±0.10a	1.38±0.16a	39.21±2.77a	15.12±0.58a	219.05±9.89a	62.80±5.59a	402.00±46.29a
淹水Flooded	6.37±0.16a	0.37±0.16b	30.95±3.54b	13.97±0.06b	154.97±17.46b	47.45±5.52b	244.33±34.44b

化学性质 Soil property	r	p
pH	-0.082	0.661
EC	0.546	0.098
有机质 SOM	0.492	0.065
铵态氮NH₄⁺-N	0.421	0.075
硝态氮NO₃^--N	0.746*	0.041
有效磷 Available P (AP)	0.342	0.125
有效钾 Available K (AK)	0.542	0.095
NH₄⁺-N×NO₃^--N	0.696	0.056
AP×AK	0.542	0.090
NH₄⁺-N×NO₃^--N×AP×AK	0.171	0.226
pH×EC×SOM×NH₄⁺-N×AP×AK	0.5571	0.098
pH×EC×SOM×NH₄⁺-N×NO₃^--N×AP×AK	0.5714	0.097

化学性质 Soil property	r	p
pH	0.039	0.445
EC	0.621	0.078
有机质 SOM	0.396	0.099
铵态氮NH₄⁺-N	0.242	0.158
硝态氮NO₃^--N	0.775*	0.031
有效磷 Available P (AP)	0.532	0.051
有效钾 Available K (AK)	0.567	0.086
NH₄⁺-N×NO₃^--N	0.5536	0.094
AP×AK	0.611	0.072
NH₄⁺-N×NO₃^--N×AP×AK	0.607	0.085
pH×EC×SOM×NH₄⁺-N×AP×AK	0.604	0.086
pH×EC×SOM×NH₄⁺-N×NO₃^--N×AP×AK	0.621	0.082

Effects of Flooding on Soil Chemical Properties and Microbial Community Composition on Farmland of Continuous Cropped Pepper

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