Repeated rainfall in summer induces prolonged high soil respiration in a semi‐arid floodplain woodland

Sun, Qiang; Meyer, Wayne S.; Marschner, Petra

doi:10.1002/eco.1984

Cited by 2 publications

(1 citation statement)

References 57 publications

(66 reference statements)

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“…Under normal conditions, bacteria account for more than half of the total microorganisms in steppe soils (Wang et al, 2016b). Under drought conditions, substrate supply is the main limiting factor for soil microbial activity; however, under humid conditions, oxygen diffusion determines soil microbial activity to a large extent, influencing SOM decomposition (Sun et al, 2018). Soil microbes and their cycles are an important source of soil nutrient storage and available nutrients for plant growth and can profoundly affect plant available SOM in terrestrial ecosystems (Sponseller, 2007;Fan et al, 2019).…”

Section: Soil Microbes Influence the Precipitation Pulse Effect To Some Extentmentioning

confidence: 99%

Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions

Jiang

Bian

et al. 2021

Front. Ecol. Evol.

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The rapid and strong release of CO2 caused by precipitation (known as the pulse effect) is a common phenomenon that significantly affects ecosystem C cycling. However, the degree to which the pulse effect occurs overlarge regional scales remains unclear. In this study, we conducted continuous and high-frequency measurements of soil CO2 release rates (Rs) for 48 h after simulated precipitation, along a precipitation gradient of different grassland types (i.e., meadow, typical, and desert) in Inner Mongolia, China. Pulse effects were assessed using the maximum Rs (Rsoil–max) and accumulated CO2 emissions (ARs–soil). Strong precipitation pulse effects were found in all sites; however, the effects differed among grassland types. In addition, an apparent decrease in both Rsoil–max and ARs–soil was observed from the east to west, i.e., along the decreasing precipitation gradient. ARs–soil values followed the order: temperate meadow grassland (0.097 mg C g–1 soil) > typical temperate grassland (0.081 mg C g–1 soil) > temperate desert grassland (0.040 mg C g–1 soil). Furthermore, Rsoil–max and ARs–soil were significantly positively correlated with soil quality (SOC, POC, and N, etc.; P < 0.01). ARs–soil (P < 0.05) and ARs–SOC (P < 0.01) were significantly affected. ARs–soil and ARs–SOC were also positively correlated with soil microbial biomass significantly (P < 0.05). Rsoil–max and ARs–soil had similar spatial variations and controlling mechanisms. These results greatly support the substrate supply hypothesis for the effects of precipitation pulses, and provide valuable information for predicting CO2 emissions. Our findings also verified the significant effect of soil CO2 release from precipitation pulses on the grasslands of arid and semi-arid regions. Our data provide a scientific basis for model simulations to better predict the responses of ecosystem carbon cycles in arid and semi-arid regions under predicted climate change scenarios.

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Section: Soil Microbes Influence the Precipitation Pulse Effect To Some Extentmentioning

confidence: 99%

Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions

Jiang

Bian

et al. 2021

Front. Ecol. Evol.

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Effects of pulse precipitation on soil organic matter mineralization in forests: spatial variation and controlling factors

Jiang

Bian

et al. 2021

Journal of Plant Ecology

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Aims Pulse effects of precipitation cause soil organic matter to rapidly decompose and release CO2 in a short period. The pulse effects of precipitation are important for ecosystem C cycling and soil C balance, although their spatial variation in forest soils and the underlying mechanisms remain unclear. Methods Soil samples (0 -10 cm) from 22 typical forest ecosystems in eastern China were used, to investigate the effects of simulated pulse precipitation on soil microbial respiration rates (Rs). We simulated pulsed precipitation to reach 65% water-holding capacity, the Rs were measured on a minute scale for 48 h. Important findings Precipitation pulses can cause a rapid 1.7 ~ 38.12-fold increase in the rate of mineralized decomposing organic matter. Maximum Rs (Rs-soil-max), cumulative Rs (ARs-soil), and the time taken to arrive at the maximal Rs (TRs-soil-max) were significant differences among different soil samples. Furthermore, the pulse effects in different climate zones were significantly different. Rs-soil-max (11.701 μg C g −1soil h −1) and ARs-soil (300.712 μg C g −1soil) were the highest in the mid-temperate zone. Soil chemical properties (total C and, N, pH, and oxidation–reduction potential) and soil fractions were strongly correlated with the pulse effects in forest soils, but soil microbes contributed less. Our findings demonstrated that the pulse effects increase forest soil carbon emissions in the short term at a regional scale, and identified the factors with the greatest influence on this change. These findings help guide future studies on the C cycles of forest ecosystems and regulating ecosystem C cycles.

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Repeated rainfall in summer induces prolonged high soil respiration in a semi‐arid floodplain woodland

Cited by 2 publications

References 57 publications

Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions

Pulse Effect of Precipitation: Spatial Patterns and Mechanisms of Soil Carbon Emissions

Effects of pulse precipitation on soil organic matter mineralization in forests: spatial variation and controlling factors

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