Upland soil cluster γ dominates the methanotroph communities in the karst Heshang Cave

Zhao, Rui; Wang, Hongmei; Cheng, Xiaoyu; Yun, Yuan; Qiu, Xuan

doi:10.1093/femsec/fiy192

Cited by 30 publications

(39 citation statements)

References 76 publications

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“…For example, increasing soil moisture has been shown to lower CH 4 oxidation while stimulating MOB abundance in forest soils (Shrestha et al., 2012). Recently, USC‐γ has been identified as a dominant group in grassland soils (Zhao et al., 2018), but it is not clear how the abundances of different MOB groups relate to CH 4 oxidation in soils or how they respond to land use and land‐use intensity.…”

Section: Introductionmentioning

confidence: 99%

Divergent drivers of the microbial methane sink in temperate forest and grassland soils

Täumer

Kolb

Boeddinghaus

et al. 2020

Global Change Biology

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Aerated topsoils are important sinks for atmospheric methane (CH4) via oxidation by CH4‐oxidizing bacteria (MOB). However, intensified management of grasslands and forests may reduce the CH4 sink capacity of soils. We investigated the influence of grassland land‐use intensity (150 sites) and forest management type (149 sites) on potential atmospheric CH4 oxidation rates (PMORs) and the abundance and diversity of MOB (with qPCR) in topsoils of three temperate regions in Germany. PMORs measurements in microcosms under defined conditions yielded approximately twice as much CH4 oxidation in forest than in grassland soils. High land‐use intensity of grasslands had a negative effect on PMORs (−40%) in almost all regions and fertilization was the predominant factor of grassland land‐use intensity leading to PMOR reduction by 20%. In contrast, forest management did not affect PMORs in forest soils. Upland soil cluster (USC)‐α was the dominant group of MOBs in the forests. In contrast, USC‐γ was absent in more than half of the forest soils but present in almost all grassland soils. USC‐α abundance had a direct positive effect on PMOR in forest, while in grasslands USC‐α and USC‐γ abundance affected PMOR positively with a more pronounced contribution of USC‐γ than USC‐α. Soil bulk density negatively influenced PMOR in both forests and grasslands. We further found that the response of the PMORs to pH, soil texture, soil water holding capacity and organic carbon and nitrogen content differ between temperate forest and grassland soils. pH had no direct effects on PMOR, but indirect ones via the MOB abundances, showing a negative effect on USC‐α, and a positive on USC‐γ abundance. We conclude that reduction in grassland land‐use intensity and afforestation has the potential to increase the CH4 sink function of soils and that different parameters determine the microbial methane sink in forest and grassland soils.

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Section: Introductionmentioning

confidence: 99%

Divergent drivers of the microbial methane sink in temperate forest and grassland soils

Täumer

Kolb

Boeddinghaus

et al. 2020

Global Change Biology

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“…Chemoautotrophic bacteria in a Romanian cave were found capable of fixing inorganic carbon and using hydrogen sulfide as an energy source, and their chemoautotrophic production also supported cave-adapted invertebrates (Sarbu et al, 1996). Geobiological evidence in recent years suggests that subterranean karst environments might be a global sink for atmospheric methane due to processes involving microbes (Nguyễn-Thuý et al, 2017; Webster et al, 2018; Zhao et al, 2018). A better understanding of the microbial community of cave ecosystems will not only expand our knowledge of global microbial diversity, but it also provides valuable information about energy dynamics of novel community assemblages.…”

Section: Introductionmentioning

confidence: 99%

“…It is estimated that China has hundreds of thousands of caves, but studies on bacterial communities have mainly focused on two caves, i.e., a ∼250 m long karst cave in central China (Liu et al, 2010; Yun et al, 2016a, b; Zhao et al, 2018) and a limestone cave in the western Loess Plateau (Wu et al, 2015). Recently, samples of air, water, rock, and sediment were intensively collected from eight karst caves in southwest China.…”

Section: Introductionmentioning

confidence: 99%

Diversity, Distribution and Co-occurrence Patterns of Bacterial Communities in a Karst Cave System

et al. 2019

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Caves are typified by their permanent darkness and a shortage of nutrients. Consequently, bacteria play an important role in sustaining such subsurface ecosystems by dominating primary production and fueling biogeochemical cycles. China has one of the world’s largest areas of karst topography in the Yunnan-Guizhou Plateau, yet the bacteriomes in these karst caves remain unexplored. In this study, bacteriomes of eight karst caves in southwest China were examined, and co-occurrence networks of cave bacterial communities were constructed. Results revealed abundant and diversified bacterial communities in karst caves, with Proteobacteria , Actinobacteria , and Firmicutes being the most abundant phyla. Statistical analysis revealed no significant difference in bacteriomes among the eight caves. However, a PCoA plot did show that the bacterial communities of 128 cave samples clustered into groups corresponding to sampling types (air, water, rock, and sediment). These results suggest that the distribution of bacterial communities is driven more by sample types than the separate caves from which samples were collected. Further community-level composition analysis indicated that Proteobacteria were most dominant in water and air samples, while Actinobacteria dominated the sediment and rock samples. Co-occurrence analysis revealed highly modularized assembly patterns of the cave bacterial community, with Nitrosococcaceae wb1-P19, an uncultured group in Rokubacteriales , and an uncultured group in Gaiellales , being the top-three keystone members. These results not only expand our understanding of cave bacteriomes but also inspires functional exploration of bacterial strains in karst caves.

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“…rRNA gene abundances of about 10 8 to 10 9 copies g -1 dry sample (Zhao et al, 2018), while values in soils are about 10 10 copies g -1 dry sample (Wessén et al, 2010), indicating that bacterial biomass in soils are an order of magnitude higher than in the Heshang cave environment. This site specific work on Heshang cave is consistent with the general observation that fatty acids preserved in speleothems are principally derived from the overlying soil ecosystem and vegetation, having been transported from the surface by percolating groundwater, and with only a minor proportion derived from cave ecosystems (Blyth et al, 2007;Huang et al, 2008;Li et al, 2011;Xie et al, 2005).…”

Section: Sources Of Fatty Acids In the Hs4 Stalagmitementioning

confidence: 91%

Speleothem biomarker evidence for a negative terrestrial feedback on climate during Holocene warm periods

Wang

Bendle

Greene

et al. 2019

Earth and Planetary Science Letters

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Upland soil cluster γ dominates the methanotroph communities in the karst Heshang Cave

Cited by 30 publications

References 76 publications

Divergent drivers of the microbial methane sink in temperate forest and grassland soils

Divergent drivers of the microbial methane sink in temperate forest and grassland soils

Diversity, Distribution and Co-occurrence Patterns of Bacterial Communities in a Karst Cave System

Speleothem biomarker evidence for a negative terrestrial feedback on climate during Holocene warm periods

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