Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China

Guo, Lijin; Zheng, Shixue; Cao, Cougui; Li, Chengfang

doi:10.1038/srep33155

Cited by 99 publications

(70 citation statements)

References 55 publications

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“…Soil organic c measurements. SOC of the soil samples was determined by oxidation with potassium dichromate and titration with ferrous ammonium sulfate after the samples were sieved to <0.15 mm 32 . DOC was extracted according to Liang et al 33 .…”

mentioning

confidence: 99%

Linking soil microbial community dynamics to straw-carbon distribution in soil organic carbon

Yao

Yang

et al. 2020

Sci Rep

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Returning crop residues is a possible practice for balancing soil carbon (c) loss. the turnover rate of organic c from crop residues to soil c is dependent on soil microbial community dynamics. However, the relationship between any temporal changes in the soil microbial community after crop straw inputs and the dynamics of straw-c distribution in the soil organic carbon (Soc) pool remains unclear. the present study investigated the allocation of straw-c into soil dissolved organic carbon (Doc), microbial biomass carbon (MBc), particulate organic carbon (poc) and mineral-associated organic carbon (Maoc) using stable isotope probing, as well as the temporal changes in the soil bacterial and fungal communities using high-throughput sequencing. After the first 180 days of straw decomposition, approximately 3.93% and 19.82% of straw-C was transformed into soil MaOC and POC, respectively, while 0.02% and 2.25% of straw-C was transformed into soil DOC and MBC, respectively. The temporal change of the soil microbial community was positively correlated with the dynamics of straw-c distribution to Soc (R > 0.5, P < 0.05). The copiotrophic bacteria (e.g., Streptomyces, Massilia and Sphingobacterium), cellulolytic bacteria and fungi (e.g., Dyella and Fusarium, Talaromyces), acidophilic bacteria (e.g., Edaphobacter and unclassified Acidobacteriaceae), denitrifying and N-fixing microbes (e.g., Burkholderia-Paraburkholderia, Paraphaeosphaeria and Bradyrhizobium), and fungi unclassified Sordariomycetes were significantly correlated with straw-C distribution to specific SOC fractions (P < 0.05), which explained more than 90% of the variation of straw-C allocation into soils. copiotrophic, certain cellulolytic and denitrifying microbes had positively correlated with Doc-and Maoc-derived from straw, and other cellulolytic fungi (e.g., Talaromyces) and specific bacteria (e.g. Bradyrhizobium) were positively correlated with poc-derived from straw. our results highlight that the temporal change of soil microbial community structure well reflects the conversion and distribution process of straw-c to Soc fractions. Soil organic matter, the largest terrestrial carbon (C) pool, plays an important role in improving soil fertility and sustaining soil productivity 1,2. Many agricultural management practices, such as fertilizer application, straw return, and tillage, could affect the soil organic carbon (SOC) pool 3-6 , especially the labile organic carbon fractions, such as dissolved organic carbon (DOC), microbial biomass carbon (MBC) and particulate organic carbon (POC). DOC and MBC, considered to be soil active organic C, have been reported as important factors in impacting soil fertility 7,8. Moreover, the formation, migration and transformation of DOC can affect soil microbial community structure and activity 9-11 , and the formation of mineral-associated organic carbon (MaOC) 12,13 , which usually represents the largest fraction of SOC pool 14. POC has been considered as a transition state of stable organic C, which is predominantly of...

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confidence: 99%

Linking soil microbial community dynamics to straw-carbon distribution in soil organic carbon

Yao

Yang

et al. 2020

Sci Rep

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“…Therefore, it could be a specialized genus in the degradation of complex products derived from different composts (Calleja-Cervantes et al, 2015). The genus of Gemmatimonas which was actively involved in the growth of ryegrass had been reported to be a cellulolytic bacterium (Guo et al, 2016) and might play important roles in regulating SOC dynamics (Wang et al, 2017). Actinomycetales, Gemmatimonadetes and Saprospirales were more abundant in the G. mosseae inoculation treatments compared with that with plants only.…”

Section: Changes Of Microbial Communities During Bde-209 Removalmentioning

confidence: 99%

Improved rhizoremediation for decabromodiphenyl ether (BDE-209) in E-waste contaminated soils

et al. 2019

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An experiment was conducted to improve rhizoremediation for decabromodiphenyl ether (BDE-209) contaminated soil from typical E-waste dismantling areas. Plants of ryegrass (Lolium perenne L.) and rice (Oryza sativa L.) were cultivated in aged-contaminated (initial concentration of 346.3 µg BDE-209$kg-1) and freshly-spiked (initial concentration of 3127 µg BDE-209$kg-1) soils, coupling with the agricultural modification strategies of compost addition and/or arbuscular mycorrhizal fungi (AMF) infection, respectively. 60 days' growth of ryegrass significantly facilitated the dissipation of BDE-209, with the most effective in its rhizosphere in treatment inoculated with AMF; the BDE-209 dissipation rates achieved 51.9% and 22.8% in rhizosphere, and 43.5% and 19.8% in non-rhizosphere, for aged-contaminated and freshlyspiked soils, respectively. 120 days' growth of rice with simultaneous inoculation of AMF and addition of compost was the most effective in facilitating BDE-209 dissipation in agedcontaminated soil, with the removal rates of 53.3% and 48.1% in rhizosphere and nonrhizosphere soils respectively; while for freshly-spiked soils, the most effective removal was achieved by compost addition only, with the BDE-209 dissipation rates of 27.9% and 26.6% in rhizosphere and non-rhizosphere soils, respectively. High throughput sequencing analysis of rhizosphere soil DNA showed that responses in microbial communities and their structure differed with plant species, soil pollution dose, AMF inoculation and/or compost addition. Actinomycetales, Xanthomonadales, Burkholderiales, Sphingomonadales, Clostridiales, Cytophagales, Gemmatimonadales and Saprospirales were the sensitive responders and even possibly potential functional microbial groups during the facilitated removal of BDE-209 in soils. This study illustrates an effective rhizoremediation pattern for removal of BDE-209 in pollution soils, through successive cultivation of rice and followed by ryegrass, with rice growth coupled with AMF inoculation and compost addition, while ryegrass growth coupled with AMF inoculation only.

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“…The population of cellulolytic bacteria was significantly higher in ZT treatment than those of conventional practice, which exposed that some individual nutrient elements present in that particular treatments might have increased the microbial populations . Significantly higher bacterial populations were reported under long‐term ZT soil than conventional in subtropical paddy soil .…”

Section: Discussionmentioning

confidence: 92%

Structural diversity and efficacy of culturable cellulose decomposing bacteria isolated from rice–pulse resource conservation practices

et al. 2019

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The diversity of cellulolytic bacteria from the rice-pulse system can be sourced for identification of efficient cellulose decomposing microbial strains. In the present study, the abundance, structural diversity, and cellulolytic potential of the culturable bacterial community were studied in 5-year old rice-pulse system under different resource conservation technologies. Higher cellulose (68% more) and xylanase (35% more) activities were observed under zero tilled soil. The populations of cellulolytic bacteria were significantly higher (44%) in zero tillage (ZT) treatment than those of conventional practice. Results revealed that the cellulolytic bacterial diversity was found to be significantly higher under ZT practice, but the present population may not be sufficient for effective recycling of organic wastes in this system. Out of 290 bacterial isolates, 20 isolates had significantly higher cellulolytic activities, of which the top three superior isolates were received from ZT practice.The cellulolytic bacterial diversity based on 16S rDNA sequencing data revealed that the Firmicutes was the most dominant phyla and the Bacillus spp. were the common genus, the observation also showed that there were 17 different haplotypes were recorded among 20 isolates of cellulolytic bacteria. The present findings indicated that long-term ZT in the rice-pulse system could be a unique source for efficient cellulose decomposing bacteria and further the efficient bacterial strains isolated from this system can be used as efficient bioinoculants for in situ as well as ex-situ decomposition of rice straw particularly in conservation agriculture. K E Y W O R D S

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Tillage practices and straw-returning methods affect topsoil bacterial community and organic C under a rice-wheat cropping system in central China

Cited by 99 publications

References 55 publications

Linking soil microbial community dynamics to straw-carbon distribution in soil organic carbon

Linking soil microbial community dynamics to straw-carbon distribution in soil organic carbon

Improved rhizoremediation for decabromodiphenyl ether (BDE-209) in E-waste contaminated soils

Structural diversity and efficacy of culturable cellulose decomposing bacteria isolated from rice–pulse resource conservation practices

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