Preprints
https://doi.org/10.5194/egusphere-2022-1290
https://doi.org/10.5194/egusphere-2022-1290
 
14 Dec 2022
14 Dec 2022

Effects of Warming and Increased Precipitation on Soil Microbial Residues on the Qinghai–Tibet Alpine Meadows

Baisha Weng1, Zhaoyu Dong1, Yuheng Yang1, Denghua Yan1, Mengyu Li1, and Yuhang Zhang1,2 Baisha Weng et al.
  • 1State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resourcesand Hydropower Research, Beijing 100038, China
  • 2College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China

Abstract. Amino sugars, as the biomarkers of microbial residues, help explore soil microorganisms’ response to global climate change. However, research on how microorganisms in the alpine meadows regulate the soil carbon cycle under the influence of climate change is limited. We hypothesized that climate change might cause different effects on soil microbial residues due to the impact on soil physical properties, chemical properties, and enzyme activities. Therefore, we conducted four-year continuous warming and increased precipitation experiments in the semi-arid grasslands to examine the differences in soil microbial residues at different depths under simulated changes. The results showed warming stimulated the accumulation of microbial residues, while increased precipitation led to their decline. The Glucosamine/Muramic Acid ratio trend indicates that the contribution of fungal residues was more significant than that of bacteria with increased precipitation, whereas that of bacterial residues exceeded that of fungi with warming. The increased precipitation had no significant effect on soil extracellular enzyme activities and amino sugar concentrations. In addition, changes in the different enzyme activities led to soil carbon loss and different amino sugar accumulation patterns under the warming treatment. These results may aid in assessing the responses of soil microorganisms to future climate change scenarios.

Baisha Weng et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1290', Anonymous Referee #1, 31 Dec 2022
    • AC1: 'Reply on RC1', Zhaoyu Dong, 23 Jan 2023
  • RC2: 'Comment on egusphere-2022-1290', François Maillard, 12 Jan 2023
    • AC2: 'Reply on RC2', Zhaoyu Dong, 23 Jan 2023

Baisha Weng et al.

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Short summary
The study selected a structural equation model to construct the turnover rate of amino sugars with soil physicochemical properties and extracellular enzymes under the warming and increased precipitation scenarios. The results of this study answer the mechanism of action of warming and precipitation on the effect of soil amino sugars which will play an important scientific and technical support role in the development of plateau agriculture and carbon and nitrogen cycles.