Change in soil microbial biomass and regulating factors in an alpine meadow site on the Qinghai-Tibetan Plateau

Wu, Jing

doi:10.1080/00380768.2019.1705181

Cited by 18 publications

(8 citation statements)

References 109 publications

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“…ecological parameters), of farming practices through farming intensity, land use and crop rotation, but also the previous effects of farming practices and soil microbial characteristics. Soil resources (SOC, TN and water stress) and soil habitat (clay and silt contents) had significant direct positive effects on SMMB, in agreement with other studies [12,13,[70][71][72][73]. This positive effect of soil properties may be related to their slight increase/decrease, as SOC or TN variations over long-term scales may lead to drastic changes in soil microbial communities [74,75].…”

Section: Plos Onesupporting

confidence: 88%

Soil microbial communities in the face of changing farming practices: A case study in an agricultural landscape in France

et al. 2021

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According to biogeography studies, the abundance and richness of soil microorganisms vary across multiple spatial scales according to soil properties and farming practices. However, soil microorganisms also exhibit poorly understood temporal variations. This study aimed at better understanding how soil microbial communities respond to changes in farming practices at a landscape scale over time. A regular grid of 269 sites was set up across a 1,200 ha farming landscape, and soil samples were characterized for their molecular microbial biomass and bacterial richness at two dates (2011 and 2016). A mapping approach highlighted that spatial microbial patterns were stable over time, while abundance and richness levels were modified. The drivers of these changes were investigated though a PLS-PM (partial least square path-modeling) approach. Soil properties were stable over time, but farming practices changed. Molecular microbial biomass was mainly driven by soil resources, whereas bacterial richness depended on both farming practices and ecological parameters. Previous-crop and management effects and a temporal dependence of the microbial community on the historical farming management were also highlighted.

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Section: Plos Onesupporting

confidence: 88%

Soil microbial communities in the face of changing farming practices: A case study in an agricultural landscape in France

et al. 2021

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“…within the two years of the present study, the high sheep stocking density did not significantly reduce MBC due to the www.nature.com/scientificreports/ strong survival strategies of the Chinese grassland microbial communities. The turnover of microbial biomass is generally slow due to the extremely low temperatures in winter and long periods of drought in summer 49 , which allows a long survival under C limited conditions 45 . This slows down the microbial response to intensive sheep grazing of AGB.…”

Section: Discussionmentioning

confidence: 99%

Soil microbial properties of subalpine steppe soils at different grazing intensities in the Chinese Altai Mountains

Goenster‐Jordan

Ingold

Jannoura

et al. 2021

Sci Rep

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Long-term provision of ecosystem services by grasslands is threatened by increasing stocking densities. The functions of grassland ecosystems depend on a mutual relationship between aboveground and belowground biota. While the effects of increasing stocking density on plant biomass are well studied, little is known about its impact on soil microbial properties. To fill this knowledge gap a grazing experiment was conducted on a summer pasture in the Chinese Altai Mountains during the summers of 2014 and 2015 using a randomized block design with stocking densities of 0, 8, 16, and 24 sheep ha−1 replicated four times. After two summer grazing periods (each 56 days), topsoil samples (1–7 cm) were taken in September 2015 and analyzed for major physical, chemical, and microbial soil properties. Except for the metabolic quotient (qCO2; p < 0.05), the examined soil properties remained unaffected by the increasing stocking densities, likely due to high spatial variability. The qCO2 declined from 13.5 mg CO2–C g−1 microbial biomass C d−1 at zero grazing to 12.2 mg CO2–C g−1 microbial biomass C d−1 at a stocking density of 24 sheep ha−1. Low values of qCO2 indicate an aged and dormant microbial community that diverts less soil organic carbon (SOC) to catabolic processes within their cells, characteristic for C limiting conditions. The aboveground biomass affected by grazing intensity correlated positively with SOC (rs = 0.60, p = 0.015) and ergosterol (rs = 0.76, p = 0.001) pointing indirectly to the effect of stocking density. Additionally to the relatively high values of qCO2, highest values of SOC (39.2 mg g−1 soil), ergosterol (6.01 µg g−1 soil), and basal respiration (10.7 µg g−1 soil d−1) were observed at a stocking density of 8 sheep ha−1 indicating that a low grazing intensity is recommendable to avoid soil degradation.

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“…In contrast to the drought situation, increased precipitation was found to decrease MBC:MBN in water addition experiments [125], and field observation experiments similarly found that MBC:MBN decreased with increasing soil water contents [42]. The reasons for this may be the following: first, higher precipitation has a positive effect on bacterial biomass [126].…”

Section: Impacts Of Changing Precipitation Patternsmentioning

confidence: 94%

Global Climate Change Effects on Soil Microbial Biomass Stoichiometry in Alpine Ecosystems

Chen

Gao

2022

Land

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Alpine ecosystems are sensitive to global climate change-factors, which directly or indirectly affect the soil microbial biomass stoichiometry. In this paper, we have compared the soil microbial biomass stoichiometry ratios of alpine ecosystems using the global average values. In the comparison, the responses and mechanisms of soil microbial biomass stoichiometry to nitrogen deposition, altered precipitation, warming, and elevated atmospheric carbon dioxide (CO2) concentration in the alpine ecosystem were considered. The alpine ecosystem has a higher soil microbial-biomass-carbon-to-nitrogen ratio (MBC:MBN) than the global average. In contrast, the soil microbial-biomass-nitrogen-to-phosphorus (MBN:MBP) and carbon-to-phosphorus ratios (MBC:MBP) varied considerably in different types of alpine ecosystems. When compared with the global average values of these ratios, no uniform pattern was found. In response to the increase in nitrogen (N) deposition, on the one hand, microbes will adopt strategies to regulate extracellular enzyme synthesis and excrete excess elements to maintain stoichiometric balance. On the other hand, microbes may also alter their stoichiometry by storing excess N in their bodies to adapt to the increased N in the environment. Thus, a decrease in MBC:MBN and an increase in MBN:MBP are observed. In addition, N deposition directly and indirectly affects the soil fungal-to-bacterial ratio (F:B), which in turn changes the soil microbial biomass stoichiometry. For warming, there is no clear pattern in the response of soil microbial biomass stoichiometry in alpine ecosystems. The results show diverse decreasing, increasing, and unchanging patterns. Under reduced precipitation, microbial communities in alpine ecosystems typically shift to a fungal dominance. The latter community supports a greater carbon-to-nitrogen ratio (C:N) and thus an increased soil MBC:MBN. However, increased precipitation enhances N effectiveness and exacerbates the leaching of dissolved organic carbon (DOC) and phosphorus (P) from alpine ecosystem soils. As a result, a decrease in the soil MBC:MBN and an increase in the soil MBN:MBP are evident. Elevated atmospheric CO2 usually has little effect on the soil MBC:MBN in alpine ecosystems, mainly because of two reasons. These are: (i) N is the main limiting factor in alpine ecosystems, and (ii) alpine ecosystems accumulate higher soil organic carbon (SOC) and microbes and preferentially decompose “old” carbon (C) stocks. The response of soil microbial stoichiometry to global climate change factors in alpine ecosystems is diverse, and the impact pathways are complex. Future studies need to focus on the combined effects of multiple global climate change factors on microbial stoichiometry and the mechanism of microbial stoichiometric balance.

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Change in soil microbial biomass and regulating factors in an alpine meadow site on the Qinghai-Tibetan Plateau

Cited by 18 publications

References 109 publications

Soil microbial communities in the face of changing farming practices: A case study in an agricultural landscape in France

Soil microbial communities in the face of changing farming practices: A case study in an agricultural landscape in France

Soil microbial properties of subalpine steppe soils at different grazing intensities in the Chinese Altai Mountains

Global Climate Change Effects on Soil Microbial Biomass Stoichiometry in Alpine Ecosystems

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