Fertilization decreases compositional variation of paddy bacterial community across geographical gradient

Chen, Ruirui; Zhong, Linghao; Jing, Zhongwang; Guo, Zhiying; Li, Zhongpei; Lin, Xiangui; Feng, Youzhi

doi:10.1016/j.soilbio.2017.07.013

Cited by 61 publications

(39 citation statements)

References 32 publications

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“…Thus, the microbial composition of alpine lake sediments is affected. Sediment SWC (Guo et al., ), pH (Zhao et al., ), DO (Yadav, Khardenavis, & Kapley, ), depth (Zhang et al., ), and geographic factors such as altitude (Chen et al., ) can also influence the composition of microbial communities. From the sample–environment relationship (Figure b) we found that the two groups that are geographically close (DK, WD‐2, and ZN; NB‐1 and SL) are distributed far apart in the figure.…”

Section: Resultsmentioning

confidence: 99%

Microbial community composition in alpine lake sediments from the Hengduan Mountains

et al. 2019

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Microbial communities in sediments play an important role in alpine lake ecosystems. However, the microbial diversity and community composition of alpine lake sediments from the Hengduan Mountains remain largely unknown. Therefore, based on the Illumina MiSeq platform, high‐throughput sequencing analysis of the 16S rRNA gene was performed on 15 alpine lake sediments collected at different locations in the Hengduan Mountains. The abundance‐based coverage estimate (ACE), Chao1, and Shannon indices indicated that the microbial abundance and diversity of these sediments were high. There are some differences in the composition of microbial communities among sediments. However, in general, Proteobacteria accounted for the largest proportion of all sediments (22.3%–67.6%) and was the dominant phylum. Followed by Bacteroidetes, Acidobacteria, Chloroflexi, and Planctomycetes. In addition, the operational taxonomic unit (OTU) interactions network had modular structures and suggested more cooperation than competition in the microbial community. Besides, we also found that temperature has a significant contribution to the sample–environment relationship. This study revealed the diversity and composition of microbial communities in alpine lake sediments from the Hengduan Mountains, and describe the correlation between microbial community structure and different environmental variables.

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Section: Resultsmentioning

confidence: 99%

Microbial community composition in alpine lake sediments from the Hengduan Mountains

et al. 2019

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“…The pRDA analysis also revealed a significant correlation ( p < 0.01) between geographic distance and microbial community dissimilarity (Table ). This distance effect might be attributable to the role of dispersal limitation in the biogeographic pattern of microbial community (Chen et al ., ; Zhang et al ., ). However, the relative importance of geographic distance effect on the patterns differed between different microbial groups, as expected.…”

Section: Discussionmentioning

confidence: 97%

“…Bacteria and fungi, two major microbial communities, are vastly different in regard to their morphological traits, growth rates, environmental sensitivities and substrate utilizations (Hannula et al ., ). Numerous studies on soil ecosystems have demonstrated that both bacterial and fungal communities have responded to ecological mechanisms that drive compositional variations (Chen et al ., ; Fan et al ., ). Until recently, dispersal limitation and environmental selection have been widely accepted as two of the principal forces driving microbial distribution (Martiny et al ., ; Chu et al ., ; Zhang et al ., ; Zhang et al ., ), and the relative importance of these factors depends on spatial scales, habitat types and taxon traits (Hanson et al ., ; Wu et al ., ; Wang et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Fungal community demonstrates stronger dispersal limitation and less network connectivity than bacterial community in sediments along a large river

Juan

Wang

et al. 2019

Environmental Microbiology

133

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Summary Despite the essential functions of sedimentary bacterial and fungal communities in biogeochemical cycling, little is known about their biogeographic patterns and driving processes in large rivers. Here we investigated the biogeographic assemblies and co‐occurrence patterns of sedimentary bacterial and fungal communities in the Jinsha River, one of the largest rivers in southwestern China. The mainstream of river was divided into upstream, midstream and downstream. The results showed that both bacterial and fungal communities differed significantly among three sections. For both communities, their composition variations in all sites or each river section were controlled by the combination of dispersal limitation and environmental selection, and dispersal limitation was the dominant factor. Compared with bacteria, fungi had stronger dispersal limitation. Co‐occurrence network analyses revealed higher network connectivity but a lower proportion of positive interaction in the bacterial than fungal network at all sites. In particular, the keystone species belonging to bacterial phyla Proteobacteria and Firmicutes and fungal phyla Ascomycota and Chytridiomycota may play critical roles in maintaining community function. Together, these observations indicate that fungi have a stronger dispersal limitation influence and less network connectivity than bacteria, implying different community assembly mechanisms and ecological functions between bacteria and fungi in large rivers.

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“…A principal component analysis (PCA) was carried out on the variance–covariance matrix and the results were used to explore the differences in relative intensity of carbon fractions by 13 C NMR under different treatments across the four experimental sites. Permutational multivariate analysis of variance (PERMANOVA) (Chen et al, ) using 9,999 permutations was also conducted to show dissimilarity in 13 C NMR structural information among the fertilizer treatments, in which the global test and pairwise comparisons were based on different fertilization regimes combining all experimental sites. The Mantel test was carried out to explore the relative intensity of carbon fractions in 13 C NMR spectra that correlated strongly with the rates of growth inhibition of 14 phytopathogenic fungi.…”

Section: Methodsmentioning

confidence: 99%

“…Rice fields are the largest anthropogenic wetlands on Earth. In China, nearly 34 million ha of paddy fields are distributed in the subtropical zone and sustain about 40% of national food production (Chen et al, ). Long‐term application of mineral fertilizer has resulted in many environmental problems; for example, it can lead to soil acidification (Garz, Schliephake, & Merbach, ) and thus threaten the sustainability of soil fertility.…”

Section: Introductionmentioning

confidence: 99%

Long‐term mineral fertilization in paddy soil alters the chemical structures and decreases the fungistatic activities of humic acids

Wei

Liu

et al. 2019

European J Soil Science

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Fungistatic activity is a newly identified ecological function for soil humic acids. However, the relation between fungistatic activities of soil humic acids and their chemical structures is still unclear. In addition, how fertilizer application affects fungistatic activity is still unknown. We sampled paddy soils with different long‐term fertilizer schemes, namely: unfertilized control (CK), mineral fertilizer applied (NPK) and mineral fertilizer applied plus straw return (NPKRS). Soil humic acids were extracted and their fungistatic activities against 14 phytopathogenic fungi were investigated to evaluate their ecological functions. The humic acids from NPK and NPKRS treatments showed much smaller fungistatic effects than those from CK treatments. The chemical structures of humic acids were investigated by 13C nuclear magnetic resonance (13C NMR) spectroscopy. Long‐term fertilization significantly changed the chemical structure of soil humic acid, and the variation in chemical structure affected the fungistatic activities. The relative content of alkoyl C and alkyl C, the alkoyl C/alkyl C ratio and aliphaticity all had positive correlations with the fungistatic effects of humic acids. That indicated humic acids with more aliphatic and decomposable structures showed more fungistatic activity. From the results, we believe that long‐term application of mineral fertilizer in paddy fields makes the soil humic acids less aliphatic and more recalcitrant, and concomitantly weakens their ability to inhibit phytopathogenic fungi. Highlights We studied the inhibitory effects of paddy soil humic acids on 14 phytopathogenic fungi. Fertilization‐induced changes in humic acids affect inhibition of phytopathogenic fungi. Long‐term mineral fertilization significantly changed chemical structures of humic acids. Humic acid with more aliphatic and decomposable structures had more fungistatic activity.

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Fertilization decreases compositional variation of paddy bacterial community across geographical gradient

Cited by 61 publications

References 32 publications

Microbial community composition in alpine lake sediments from the Hengduan Mountains

Microbial community composition in alpine lake sediments from the Hengduan Mountains

Fungal community demonstrates stronger dispersal limitation and less network connectivity than bacterial community in sediments along a large river

Long‐term mineral fertilization in paddy soil alters the chemical structures and decreases the fungistatic activities of humic acids

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