Responses of soil ammonia oxidizers and denitrifiers to different grazing intensities

Yifei, 孙翼飞 Sun; Shen, Ju-Pei; Cuijing, 张翠景 Zhang; Guodong, 韩国栋 Han; Mei, 红梅 Hong; Bayinnamula, 赵巴音那木拉 Zhao; Jizheng, 贺纪正 He

doi:10.5846/stxb201704270772

Cited by 2 publications

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“…The response of microbial biomass carbon varied with grazing gradients and time, with the effects of light grazing and heavy grazing decreasing over time and the effects of moderate grazing decreasing first and then increasing; no such interaction was observed for the biomass nitrogen [62]. Ammonia-oxidizing bacteria displayed the lowest abundance during moderate grazing, with an 18.1% reduction, and the diversity indices of both ammonia-oxidizing bacteria and ammonia-oxidizing archaea decreased with increasing grazing intensity [105]. The total amount of phospholipid fatty acids in soil microbial communities was positively correlated with grazing intensity, which was 12.4% and 37.3% higher than that for moderate and heavy grazing, respectively [106].…”

Section: Effect Of Grazing On Soil Microorganismsmentioning

confidence: 99%

Advances in Meta-Analysis of the Effects of Grazing on Grassland Ecosystems in China

et al. 2023

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Grassland ecosystems are among the largest terrestrial ecosystems in China, and grazing, as an important grassland management method, has direct and indirect impacts on grassland ecosystems. Meta-analyses can be used to systematically evaluate and summarize multiple findings from existing studies, but there have been few comparisons of meta-analysis methods. In this review, we summarize the effects of grazing on grassland plants and soil in the existing meta-analysis studies in China from 38 meta-analysis papers. The results show that they have consistent conclusions, such as grazing reduces the aboveground biomass by approximately half, increases the soil pH, decreases the C:N:P ratio, and reduces the number of topsoil microorganisms, but the conclusions of light and moderate grazing index changes vary greatly from study to study. The belowground biomass was generally found to increase, but it slightly decreased in some cases, and the total biomass generally decreased, but it slightly increased in other cases. Vegetation coverage increased during moderate grazing; the soil moisture content was highest for light grazing, and microbial diversity increased at light to moderate levels of grazing. There are also very inconsistent conclusions due to the different datasets and quantities of samples used in meta-analysis studies, as well as variations in the types and scales of grassland areas. The ranges of changes in other indicators were large, especially for the root-shoot ratio and soil carbon. However, changes in the aboveground biomass were generally stable. We suggest subsequent meta-analyses of grazing should further clarify the classification of grassland types and compare conclusions at different scales. Additionally, standardized network analyses are recommended for field manipulation experiments to further improve the accuracy of meta-analysis and reduce the temporal and spatial limitations of existing data.

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Section: Effect Of Grazing On Soil Microorganismsmentioning

confidence: 99%

Advances in Meta-Analysis of the Effects of Grazing on Grassland Ecosystems in China

et al. 2023

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“…Moderate grazing usually improves microbial diversity, changes the microbial community structure, improves soil quality, and maximizes grassland productivity [16]. Sun et al (2018) [17] showed that changes in the available nitrogen content caused by grazing led to significant changes in the ammonia-oxidizing microbial community structure. Xun et al (2018) [18] showed that grazing changed the microbial composition of meadow grasslands from slow-growing fungi to fast-growing bacteria-dominated communities.…”

Section: Introductionmentioning

confidence: 99%

Grazing Regulates Changes in Soil Microbial Communities in Plant-Soil Systems

Zhang

Wang

et al. 2023

Agronomy

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Soil microorganisms promote material transformation and energy flow in the entire ecological environment and play a key role in the stability and development of grassland ecosystems. Studies on the impacts of grazing on the soil microbial community and the establishment of a reasonable grazing intensity are crucial to improve our knowledge of the mechanisms underlying grassland degradation and to accurately assess the influence of grazing management on grassland functions and the nutrient cycle. Based on the grassland grazing control experimental platform, we compared the structure and diversity characteristics of soil microbial communities under six grazing intensities (0.00, 0.23, 0.34, 0.46, 0.69, and 0.92 AU ha−1) (1 AU = 500 kg of adult cattle) on the Hulunbuir Leymus chinensis meadow steppe. The results showed that soil microbial biomass carbon (MBC) and nitrogen (MBN) decreased with increasing soil depth. The 0–10 cm soil layer of G0.34 had the highest MBC and MBN, and the G0.92 treatment had the lowest MBC and MBN. Heavy grazing significantly decreased the MBC and MBN contents in the soil surface layer. The soil bacterial diversity under light grazing treatment (0.23 AU ha−1) was higher than that under heavy grazing, and the fungal diversity under the no-grazing treatment was higher than that under the grazing treatment. Overgrazing reduced the bacterial species in the soil. The plant belowground biomass significantly (p = 0.039) influenced the bacterial community structure, and the soil pH (p = 0.032), total nitrogen (p = 0.011), and litter (p = 0.007) significantly influenced the fungal community. The effects of grazing on microbial communities were primarily driven by vegetation productivity, litter mass, and soil geophysical and chemical characteristics. This study deepened our understanding of the impacts of grazing practices on soil microbial communities on the meadow steppe, suggesting that moderate-disturbance grazing can promote the sustainable development of grassland vegetation-soil microorganisms.

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Responses of soil ammonia oxidizers and denitrifiers to different grazing intensities

Cited by 2 publications

References 0 publications

Advances in Meta-Analysis of the Effects of Grazing on Grassland Ecosystems in China

Advances in Meta-Analysis of the Effects of Grazing on Grassland Ecosystems in China

Grazing Regulates Changes in Soil Microbial Communities in Plant-Soil Systems

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