Effects of 7 years experimental warming on soil bacterial and fungal community structure in the Northern Tibet alpine meadow at three elevations

Yu, Chengqun; Han, Fusong; Fu, Gang

doi:10.1016/j.scitotenv.2018.11.309

Cited by 105 publications

(63 citation statements)

References 38 publications

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“…In the current study, SOC content is higher within the southeastern boundary of the QTP than in the Haibei alpine meadow located in the inner QTP 51,88 , and a little higher than in alpine grasslands with an altitude of over 4500 m located in the Tibet 103–105 , but is lower than in the Zoigê alpine wetland located at the eastern edge of the QTP 106,107 . The Rs rate in the alpine wetland meadows in this study is roughly similar to that of degraded grassland located at the northeastern edge of the QTP 108 , but it is higher than in the Haibei alpine meadow 36,51,88,94 and the inner QTP 11,57,75,76,98 .…”

Section: Discussioncontrasting

confidence: 47%

Dynamics of Soil Respiration in Alpine Wetland Meadows Exposed to Different Levels of Degradation in the Qinghai-Tibet Plateau, China

Gao

Wen

et al. 2019

Sci Rep

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The effects of degradation of alpine wetland meadow on soil respiration (Rs) and the sensitivity of Rs to temperature (Q 10 ) were measured in the Napa Lake region of Shangri-La on the southeastern edge of the Qinghai-Tibet Plateau. Rs was measured for 24 h during each of three different stages of the growing season on four different degraded levels. The results showed: (1) peak Rs occurred at around 5:00 p.m., regardless of the degree of degradation and growing season stage, with the maximum Rs reaching 10.05 μmol·m −2 ·s −1 in non-degraded meadows rather than other meadows; (2) the daily mean Rs value was 7.14–7.86 μmol·m −2 ·s −1 during the mid growing season in non-degraded meadows, and declined by 48.4–62.6% when degradation increased to the severely degraded level; (3) Q 10 ranged from 7.1–11.3 in non-degraded meadows during the mid growing season, 5.5–8.0 and 6.2–8.2 during the early and late growing seasons, respectively, and show a decline of about 50% from the non-degraded meadows to severely degraded meadows; (4) Rs was correlated significantly with soil temperature at a depth of 0–5 cm (p < 0.05) on the diurnal scale, but not at the seasonal scale; (5) significant correlations were found between Rs and soil organic carbon (SOC), between biomass and SOC, and between Q 10 and Rs (p < 0.05), which indicates that biomass and SOC potentially impact Q 10 . The results suggest that vegetation degradation impact both Rs and Q 10 significantly. Also, we speculated that Q 10 of alpine wetland meadow is probable greater at the boundary region than inner region of the Qinghai-Tibet Plateau, and shoule be a more sensitive indicator in the studying of climate change in this zone.

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Section: Discussioncontrasting

confidence: 47%

Dynamics of Soil Respiration in Alpine Wetland Meadows Exposed to Different Levels of Degradation in the Qinghai-Tibet Plateau, China

Gao

Wen

et al. 2019

Sci Rep

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“…Total genomic DNA was extracted from intestine samples and environmental water samples using a Stool DNA Kit (OMEGA Bio-Tek, Norcross, GA) as per the manufacturer's instructions. Then V4-V5 region of bacterial 16S rRNA gene were amplified by using barcode primers 515F (5 -GTGCCAGCMGCCGCGGTAA-3 ) and 907R (5 -CCGTCAATTCMTTTRAGTTT-3 ) (Sun et al, 2013;Yu, Han & Fu, 2019). The amplicons were pooled, purified and then quantified using a Nanodrop (Thermo Scientific, MA).…”

Section: Dna Extraction and 16s Rrna Gene Sequencingmentioning

confidence: 99%

Early-life intestinal microbiome in Trachemys scripta elegans analyzed using 16S rRNA sequencing

Qin

Chen

Ding

et al. 2020

PeerJ

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During the early-life period, the hatchlings of red-eared slider turtles (Trachemys scripta elegans) rely on their own post-hatching internal yolk for several days before beginning to feed. The gut microbiome is critical for the adaptation of organisms to new environments, but, to date, how the microbiome taxa are assembled during early life of the turtle is unknown. In this study, the intestinal microbiome of red-eared slider hatchlings (fed on commercial particle food) was systematically analyzed at four different growth stages (0 d, 10 d, 20 d, 30 d) by a high-throughput sequencing approach. Results showed that the dominant phyla were Firmicutes (58.23%) and Proteobacteria (41.42%) at 0-day, Firmicutes (92.94%) at 10-day, Firmicutes (67.08%) and Bacteroidetes (27.17%) at 20-day, and Firmicutes (56.46%), Bacteroidetes (22.55%) and Proteobacteria (20.66%) at 30-day post-hatching. Members of the Bacteroidaceae family were absent in 0-day and 10-day turtles, but dominated in 20-day and 30-day turtles. The abundance of Clostridium also showed the highest value in 10-day turtles. The richness of the intestinal microbiomes was lower at 0-day and 30-day than that at 10-day and 20-day, while the diversity was higher at 10-day and 30-day than that at 0-day and 20-day. The results endowed the turtles with an ability to enhance their tolerance to the environment.

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“…Soil temperature and moisture during all three precipitation periods of the first precipitation were both lower than those during the second precipitation event. Different soil temperature and moisture conditions can result in different rates of microbial activity, and microbial activity can also affect soil respiration and its response to precipitation events 12,31,32 . Temperature and moisture are the main driving factors of the change in the soil microbial community, and there are thresholds for the effects of temperature and moisture on soil microorganisms.…”

Section: Discussionmentioning

confidence: 99%

Effect of precipitation on respiration of different reconstructed soils

Lei

Han²

2020

Sci Rep

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Respiration and hydrothermal characteristics of four reconstructed soils in barren gravel land at a site in Shaanxi Province were monitored before, during, and after two precipitation events. Both precipitation events significantly reduced soil temperature but there were great fluctuations in temperature after the second precipitation event. Moreover, precipitation increased the moisture content of the reconstructed soils. Before the first precipitation event, the soil volumetric water content was relatively stable, while it gradually decreased before the second precipitation event. The first precipitation event significantly stimulated the respiration rate for all reconstructed soils, while the second precipitation event generally inhibited it, especially during the precipitation event. The key factors influencing respiration for different reconstructed soils were different between the precipitation events. When soil volumetric water content showed persistent variation before precipitation, soil moisture was the most influential factor. In contrast, if water content was stable, soil temperature was more influential. Soil moisture and temperature jointly influenced soil respiration before, during, and after the precipitation event, while soil moisture was always the most influential factor after precipitation. Soil respiration is the main component of the carbon cycle in terrestrial ecosystems. It is the second largest source of carbon emissions after atmospheric photosynthesis between the atmosphere and terrestrial ecosystems 1,2. Small changes in soil respiration significantly affected global carbon dynamics 3. A detailed analysis of the dynamics of soil respiration and its controlling factors is of great significance for accurately predicting changes in the carbon cycle under future climate change conditions 4. Soil temperature and soil moisture are the most important environmental factors affecting soil respiration 5,6 , and there is an interaction between the effects of soil temperature and soil moisture on soil respiration. Under conditions of future climate change, precipitation will change greatly, and the frequency of drought and extreme precipitation will increase 7. There are two different views on how precipitation might affect soil respiration. One is that precipitation will strongly and quickly stimulate soil respiration. This pulse is called the 'Birch effect' 8. However, it has been shown that the 'Birch effect' does not apply to all soils, and that for moist to wet soils, precipitation will instead inhibit soil respiration 9. The effect of precipitation on soil respiration is affected by environmental conditions such as soil temperature and moisture, and there is complex relationship of soil respiration with soil temperature and moisture. Several previous studies have demonstrated that there are many factors that could influence the response of soil respiration to precipitation events, including, both antecedent soil moisture and precipitation conditions 10 , different soil temperature and moistu...

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Effects of 7 years experimental warming on soil bacterial and fungal community structure in the Northern Tibet alpine meadow at three elevations

Cited by 105 publications

References 38 publications

Dynamics of Soil Respiration in Alpine Wetland Meadows Exposed to Different Levels of Degradation in the Qinghai-Tibet Plateau, China

Dynamics of Soil Respiration in Alpine Wetland Meadows Exposed to Different Levels of Degradation in the Qinghai-Tibet Plateau, China

Early-life intestinal microbiome in Trachemys scripta elegans analyzed using 16S rRNA sequencing

Effect of precipitation on respiration of different reconstructed soils

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Effects of 7 years experimental warming on soil bacterial and fungal community structure in the Northern Tibet alpine meadow at three elevations

Cited by 105 publications

References 38 publications

Dynamics of Soil Respiration in Alpine Wetland Meadows Exposed to Different Levels of Degradation in the Qinghai-Tibet Plateau, China

Dynamics of Soil Respiration in Alpine Wetland Meadows Exposed to Different Levels of Degradation in the Qinghai-Tibet Plateau, China

Early-life intestinal microbiome in Trachemys scripta elegans analyzed using 16S rRNA sequencing

Effect of precipitation on respiration of different reconstructed soils

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Effects of 7 years experimental warming on soil bacterial and fungal community structure in the Northern Tibet alpine meadow at three elevations