Wetland reclamation homogenizes microbial properties along soil profiles

Zhu, Xiancan; Zhang, Lihua; Zuo, Yunjiang; Liu, Jianzhao; Yu, Jihao; Yuan, Fenghui; Wang, Nannan; He, Liyuan; Wang, Yihui; Guo, Ziyu; Sun, Youbin; Song, Yanyu; Song, Changchun; Guo, Dufa; Xu, Xiaofeng

doi:10.1016/j.geoderma.2021.115075

Cited by 22 publications

(7 citation statements)

References 86 publications

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“…The inhibition effects of cultivation were also remarkably different along with soil profiles, with more extensive surface layers such as 0 to 30 cm than those in the subsurface layers (Figure 2). The influence of cultivation on methanogenic functional genes along soil profiles was also proved by our previous study on microbial biomass characteristics (Zhu et al, 2021) and several other research (He et al, 2017;Jerman et al, 2017). The cultivation mainly affected surface soil and generated less dissimilar soil microbial biomass, community structure, and functional genes.…”

Section: Correlations Of Functional Genes Their Proportions With Othe...supporting

confidence: 67%

“…Cropland has been converted from the same wetland in 1996, and Soybean [ Glycine max (L.) Merr.] was cultivated in cropland from May to October every year without any fertilization and stand litter removal (Zhu et al, 2021 ). The soil texture in our study site is silty loam.…”

Section: Methodsmentioning

confidence: 99%

“…), were measured using high-temperature combustion and heating digestion methods, respectively (Zhu et al, 2021 ). Soil microbial biomass carbon (MBC), nitrogen (MBN), phosphorus (MBP), and sulfur (MBS) were measured using the fumigation method (Zhu et al, 2021 ). Soil water content (SWC) and soil temperature (S.T.)…”

Section: Methodsmentioning

confidence: 99%

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Metagenomic evidence of suppressed methanogenic pathways along soil profile after wetland conversion to cropland

Wang

Zhu²,

Zuo³

et al. 2022

Front. Microbiol.

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Wetland conversion to cropland substantially suppresses methane (CH4) emissions due to the strong suppression of methanogenesis, which consists of various pathways. In this study, we evaluated the cultivation impacts on four predominant CH4 production pathways, including acetate, carbon dioxide (CO2), methylamines, and methanol, in a wetland and cultivated cropland in northeastern China. The results showed significant suppression of CH4 production potential and the abundance of genes for all four methanogenic pathways in cropland. The consistency between CH4 production and methanogenesis genes indicates the robustness of genomic genes in analyzing methanogenesis. The suppression effects varied across seasons and along soil profiles, most evident in spring and 0 to 30 cm layers. The acetate pathway accounted for 55% in wetland vs. 70% in the cropland of all functional genes for CH4 production; while the other three pathways were stronger in response to cultivation, which presented as stronger suppressions in both abundance of functional genes (declines are 52% of CO2 pathway, 68% of methanol pathway, and 62% of methylamines pathway, vs. 19% of acetate pathway) and their percentages in four pathways (from 20 to 15% for CO2, 15 to 9% for methylamines, and 10 to 6% for methanol pathway vs. 55 to 70% for acetate pathway). The structural equation models showed that substrate availability was most correlated with CH4 production potential in the wetland, while the positive correlations of acetate, CO2, and methylamine pathways with CH4 production potential were significant in the cropland. The quantitative responses of four CH4 production pathways to land conversion reported in this study provide benchmark information for validating the CH4 model in simulating CH4 cycling under land use and land cover change.

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Section: Correlations Of Functional Genes Their Proportions With Othe...supporting

confidence: 67%

Section: Methodsmentioning

confidence: 99%

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Metagenomic evidence of suppressed methanogenic pathways along soil profile after wetland conversion to cropland

Wang

Zhu²,

Zuo³

et al. 2022

Front. Microbiol.

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“…Ernakovich et al (2017) showed that microbial community structure and DOC content in thawed permafrost are good predictors of CO 2 emissions. Zhu et al (2021) found that microbial composition was closely related to soil carbon content in wetland. Our results showed that SOC mineralization was positively correlated with SOC content, as well as with the relative abundances of most bacterial phyla and diversity (P < 0.05).…”

Section: Linking Soil Organic Carbon Mineralization and The Soil Parameters With The Soil Bacterial Communitymentioning

confidence: 98%

Organic Carbon Mineralization and Bacterial Community of Active Layer Soils Response to Short-Term Warming in the Great Hing’an Mountains of Northeast China

Dong

Liu

et al. 2021

Front. Microbiol.

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As a buffer layer for the energy and water exchange between atmosphere and permafrost, the active layer is sensitive to climate warming. Changes in the thermal state in active layer can alter soil organic carbon (SOC) dynamics. It is critical to identify the response of soil microbial communities to warming to better predict the regional carbon cycle under the background of global warming. Here, the active layer soils collected from a wetland-forest ecotone in the continuous permafrost region of Northeastern China were incubated at 5 and 15°C for 45 days. High-throughput sequencing of the 16S rRNA gene was used to examine the response of bacterial community structure to experimental warming. A total of 4148 OTUs were identified, which followed the order 15°C > 5°C > pre-incubated. Incubation temperature, soil layer and their interaction have significant effects on bacterial alpha diversity (Chao index). Bacterial communities under different temperature were clearly distinguished. Chloroflexi, Actinobacteria, Proteobacteria, and Acidobacteria accounted for more than 80% of the community abundance at the phylum level. Warming decreased the relative abundance of Chloroflexi and Acidobacteria, while Actinobacteria and Proteobacteria exhibited increasing trend. At family level, the abundance of norank_o__norank_c__AD3 and Ktedonobacteraceae decreased significantly with the increase of temperature, while Micrococcaccac increased. In addition, the amount of SOC mineralization were positively correlated with the relative abundances of most bacterial phyla and SOC content. SOC content was positively correlated with the relative abundance of most bacterial phyla. Results indicate that the SOC content was the primary explanatory variable and driver of microbial regulation for SOC mineralization. Our results provide a new perspective for understanding the microbial mechanisms that accelerates SOC decomposition under warming conditions in the forest-wetland ecotone of permafrost region.

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“…Simulation results of the nitrogen cycle (Figures 4a, 4b , 5a , and 5b ) showed that the overall annual processes of NH 3 ‐N and TN concentrations in TGR did not change much, implying that the nitrogen cycle basically remained stable in spite of drastic changes in water and sediment inflows, and thus, reducing the potential environmental risk brought by fierce fluctuation of nitrogenous substances concentrations. On the other hand, steady processes of NH 3 ‐N and TN concentrations in the TGR also indicated a relatively stable microbial community in the water body and in the sediment (Geng et al., 2022 ), as similar phenomenon had occurred in soils (Zhu et al., 2021 ). Since the diversity of microbial community in water and sediments is usually considered as a potential bio‐indicator to ecosystem health and to the degree of human perturbation (Newsome & Falagán, 2021 ; Wang et al., 2022 ), this relatively stable microbial community might suggest that aquatic environmental health did not deteriorate (Dzoga et al., 2018 ; Wang et al., 2022 ).…”

Section: Discussionmentioning

confidence: 87%

Stability of Aquatic Nitrogen Cycle Under Dramatic Changes of Water and Sediment Inflows to the Three Gorges Reservoir

et al. 2022

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Stability of nitrogen cycle is a key indicator to aquatic health. In recent years, water and sediment inflows to the Three Gorges Reservoir (TGR) have changed significantly. To reveal the effects of such dramatic hydrological changes on aquatic nitrogen cycle, this paper at first analyzed the changing trends of water and suspended sediment discharges of TGR based on dynamic harmonic regression, and found that the intra‐year distribution of water flow was significantly homogenized between flood and dry seasons, with the seasonal variations narrowed by 43.5%–69.9% during 2007–2016, while sediment concentration sharply dropped (the non‐periodic term decreased by 1.48%–2.07%/month). Modified with the effects of sediment concentration variations on nitrification/denitrification rates, the proposed numerical model surprisingly showed that ammonia nitrogen and total nitrogen concentrations in TGR were insensitive to either water flow homogenization or sediment reduction, implying relative stability of microbial community related to nitrogen cycle, which is a positive sign for aquatic health. However, N 2 emission varied more violently. The variation range of nitrogen gas (N 2 ) emitted from TGR enlarged by 30% with the homogenization of water inflow from 2010 to 2016, while the annual total N 2 emission decreased by 7% due to the reduction of sediment concentration, indicating quick response and strong adaption of the microbial N 2 producing process to the environmental changes of TGR, which is beneficial for maintaining ecological functions related to nitrogen cycling. This work helps understanding nitrogen cycle of reservoirs experiencing dramatic changes in water and sediment inflows.

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Wetland reclamation homogenizes microbial properties along soil profiles

Cited by 22 publications

References 86 publications

Metagenomic evidence of suppressed methanogenic pathways along soil profile after wetland conversion to cropland

Metagenomic evidence of suppressed methanogenic pathways along soil profile after wetland conversion to cropland

Organic Carbon Mineralization and Bacterial Community of Active Layer Soils Response to Short-Term Warming in the Great Hing’an Mountains of Northeast China

Stability of Aquatic Nitrogen Cycle Under Dramatic Changes of Water and Sediment Inflows to the Three Gorges Reservoir

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