Effects of xeric shrubs on soil microbial communities in a desert in northern China

Sun, Yanfei; Zhang, Yuqing; Feng, Wei; Qin, Shugao; Liu, Zhen; Bai, Yuxuan; Yan, Ru; Fa, Keyu

doi:10.1007/s11104-016-3111-y

Cited by 42 publications

(37 citation statements)

References 61 publications

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“…While the contribution of understory vegetation to ecosystem carbon and nitrogen stocks was very small (< 2%), as shown in Table 10, there were significant differences in understory vegetation carbon and nitrogen stocks among the three types of larch forest ecosystems. Different understory vegetation with different carbon and nitrogen stocks can alter the soil microbes [41], soil properties and structure [42] and soil temperature and water content [43], which may ultimately have a great influence on soil carbon and nitrogen [23]. This result is in agreement with previous studies [23,34].…”

Section: Vegetation Layersupporting

confidence: 91%

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Xiao

Man

Duan

2020

Forests

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Studying carbon and nitrogen stocks in different types of larch forest ecosystems is of great significance for assessing the carbon sink capacity and nitrogen level in larch forests. To evaluate the effects of the differences of forest type on the carbon and nitrogen stock capacity of the larch forest ecosystem, we selected three typical types of larch forest ecosystems in the northern part of Daxing’an Mountains, which were the Rhododendron simsii-Larix gmelinii forest (RL), Ledum palustre-Larix gmelinii forest (LL) and Sphagnum-Bryum-Ledum palustre-Larix gmelinii forest (SLL), to determine the carbon and nitrogen stocks in the vegetation (trees and understories), litter and soil. Results showed that there were significant differences in carbon and nitrogen stocks among the three types of larch forest ecosystems, showing a sequence of SLL (288.01 Mg·ha−1 and 25.19 Mg·ha−1) > LL (176.52 Mg·ha−1 and 14.85 Mg·ha−1) > RL (153.93 Mg·ha−1 and 10.00 Mg·ha−1) (P < 0.05). The largest proportions of carbon and nitrogen stocks were found in soils, accounting for 83.20%, 72.89% and 64.61% of carbon stocks and 98.61%, 97.58% and 96.00% of nitrogen stocks in the SLL, LL and RL, respectively. Also, it was found that significant differences among the three types of larch forest ecosystems in terms of soil carbon and nitrogen stocks (SLL > LL > RL) (P < 0.05) were the primary reasons for the differences in the ecosystem carbon and nitrogen stocks. More than 79% of soil carbon and 51% of soil nitrogen at a depth of 0–100 cm were stored in the upper 50 cm of the soil pool. In the vegetation layer, due to the similar tree biomass carbon and nitrogen stocks, there were no significant differences in carbon and nitrogen stocks among the three types of larch forest ecosystems. The litter carbon stock in the SLL was significantly higher than that in the LL and RL (P < 0.05), but no significant differences in nitrogen stock were found among them (P > 0.05). These findings suggest that different forest types with the same tree layer and different understory vegetation can greatly affect the carbon and nitrogen stock capacity of the forest ecosystem. This indicates that understory vegetation may have significant effects on the carbon and nitrogen stocks in soil and litter, which highlights the need to consider the effects of understory in future research into the carbon and nitrogen stock capacity of forest ecosystems.

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Section: Vegetation Layersupporting

confidence: 91%

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Xiao

Man

Duan

2020

Forests

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“…The dominant shrub species in this region is Artemisia ordosica , although sparse shrubs ( Hedysarum mongolicum, Salix psammophila , and Caragana korshinskii ) and the grass Agropyron cristatum are also indigenous to the region ( She et al, 2015 ). The study was conducted in a fenced area, in which grazing has been prohibited since the late 1990s and vegetation was allowed to recover for over a decade ( Sun et al, 2016 ).…”

Section: Methodsmentioning

confidence: 99%

Resource Availability Drives Responses of Soil Microbial Communities to Short-term Precipitation and Nitrogen Addition in a Desert Shrubland

et al. 2018

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Desert microbes are expected to be substantially sensitive to global environmental changes, such as precipitation changes and elevated nitrogen deposition. However, the effects of precipitation changes and nitrogen enrichment on their diversity and community composition remain poorly understood. We conducted a field experiment over 2 years with multi-level precipitation and nitrogen addition in a desert shrubland of northern China, to examine the responses of soil bacteria and fungi in terms of diversity and community composition and to explore the roles of plant and soil factors in structuring microbial communities. Water addition significantly increased soil bacterial diversity and altered the community composition by increasing the relative abundances of stress-tolerant (dormant) taxa (e.g., Acidobacteria and Planctomycetes); however, nitrogen addition had no substantial effects. Increased precipitation and nitrogen did not impact soil fungal diversity, but significantly shifted the fungal community composition. Specifically, water addition reduced the relative abundances of drought-tolerant taxa (e.g., the orders Pezizales, Verrucariales, and Agaricales), whereas nitrogen enrichment decreased those of oligotrophic taxa (e.g., the orders Agaricales and Sordariales). Shifts in microbial community composition under water and nitrogen addition occurred primarily through changing resource availability rather than plant community. Our results suggest that water and nitrogen addition affected desert microbes in different ways, with watering shifting stress-tolerant traits and fertilization altering copiotrophic/oligotrophic traits of the microbial communities. These findings highlight the importance of resource availability in driving the desert microbial responses to short-term environmental changes.

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“…Paired-end sequencing was implemented with Illumina MiSeq sequencing. The details of DNA extraction, quantification, amplicon and raw data processing are described by Sun et al (2016). To unify the survey, a subsample of 17,026 randomly selected sequences from each sample was used to estimate the bacterial community.…”

Section: Soil Dna Extraction 16s Rrna Gene Amplification and Sequementioning

confidence: 99%

Dominant soil bacteria and their ecological attributes across the deserts in northern China

Feng

Zhang

Yan

et al. 2019

European J Soil Science

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Soils harbour highly diverse bacterial communities that are essential for nutrient cycling and carbon storage. However, this diversity impedes the efforts to characterize individual taxa and their ecological attributes. In particular, comprehensive assessments of soil bacterial communities in drylands in China are limited. In this study, soil samples were collected across 12 deserts, covering four climatic regions (dry sub-humid, semi-arid, arid and hyper-arid) in northern China to examine the dominant phylotypes, and their environmental preferences and functional traits. Only 3.2% of the bacterial phylotypes (913 phylotypes) were dominant. These dominant phylotypes can be grouped into six major ecological clusters based on high pH, high elevation, low aridity index, high aridity index, low mean annual temperature and low soil water content, each with multiple phyla. Based on the association between diversity indexes for dominant and subdominant phylotypes, these dominant bacteria might be the drivers or indicators of key soil processes across desert soils in northern China. Genes involved in carbon fixation and decomposition and nitrogen metabolism varied across desert soils, suggesting functional differences. These findings provide deeper insights into soil bacterial communities, which are critical for forecasting the ecological consequences of ongoing global environmental change and for a better mechanistic understanding of the biogeochemical cycle. Highlights• 3.2% of the bacterial phylotypes were dominant across 12 deserts in northern China. • The dominant phylotypes were grouped into six major ecological clusters.• Carbon fixation, decomposition and nitrogen metabolism genes varied across desert soils. • Some northern China desert soils might undergo nitrogen and carbon loss in the near future. K E Y W O R D S dominant soil bacteria, dryland, metagenomic sequencing, microbial biogeography, soil bacterial ecological attribute

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Effects of xeric shrubs on soil microbial communities in a desert in northern China

Cited by 42 publications

References 61 publications

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Carbon and Nitrogen Stocks in Three Types of Larix gmelinii Forests in Daxing’an Mountains, Northeast China

Resource Availability Drives Responses of Soil Microbial Communities to Short-term Precipitation and Nitrogen Addition in a Desert Shrubland

Dominant soil bacteria and their ecological attributes across the deserts in northern China

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