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Ridge Tillage Improves Soil Properties, Sustains Diazotrophic Communities, and Enhances Extensively Cooperative Interactions Among Diazotrophs in a Clay Loam Soil
journal contributionposted on 22.01.2021, 05:04 by X Hu, A Liang, Q Yao, Z Liu, Z Yu, G Wang, Junjie Liu
© Copyright © 2020 Hu, Liang, Yao, Liu, Yu, Wang and Liu. Reduced tillage practices [such as ridge tillage (RT)] have been potential solutions to the weed pressures of long-term no tillage (NT) and the soil-intensive disturbances caused by conventional tillage [such as moldboard plow (MP) tillage]. Although soil diazotrophs are significantly important in global nitrogen (N) cycling and contribute to the pool of plant-available N in agroecosystems, little is currently known about the responses of diazotrophic communities to different long-term tillage practices. In the current study, we investigated the differences among the effects of NT, RT, and MP on soil properties, diazotrophic communities, and co-occurrence network patterns in bulk and rhizosphere soils under soybean grown in clay loam soil of Northeast China. The results showed that RT and MP led to higher contents of total C, N, and available K compared to NT in both bulk and rhizosphere soils, and RT resulted in higher soybean yield than NT and MP. Compared to NT and RT, MP decreased the relative abundances of free-living diazotrophs, while it promoted the growth of copiotrophic diazotrophs. Little differences of diazotrophic community diversity, composition, and community structure were detected between RT and NT, but MP obviously decreased diazotrophic diversity and changed the diazotrophic communities in contrast to NT and RT in bulk soils. Soil nitrogenous nutrients had negative correlations with diazotrophic diversity and significantly influenced the diazotrophic community structure. Across all diazotrophs’ networks, the major diazotrophic interactions transformed into a cooperatively dominated network under RT, with more intense and efficient interactions among species than NT and MP. Overall, our study suggested that RT, with minor soil disturbances, could stabilize diazotrophic diversity and communities as NT and possessed highly positive interactions among diazotrophic species relative to NT and MP.
This work was supported by the Key Research Program of Frontier Sciences, CAS (QYZDB-SSW-DQC035), the National Natural Science Foundation of China (41907035, 41671251, and 41877095), the Natural Science Foundation of Heilongjiang Province (D2018009), the Youth Innovation Promotion Association, Chinese Academy of Sciences (2017276), the Changchun Science and Technology Plan (19SS019), and the Innovation Leadership and Team Program in Sciences and Technologies for Young and Middle-Aged Scientists of Jilin Province.
JournalFrontiers in Microbiology
Article NumberARTN 1333
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Science & TechnologyLife Sciences & BiomedicineMicrobiologyno tillageridge tillagemoldboard plow tillagediazotrophic communitiesdiazotrophs' network analysisMICROBIAL COMMUNITYCONSERVATION TILLAGENO-TILLAGERESIDUE MANAGEMENTREDUCED TILLAGECOVER CROPSROOT-GROWTHDIVERSITYIMPACTFERTILIZATIONdiazotrophs’ network analysis