On measuring methods and influencing factors of air permeability of soils: An overview and a preliminary database

Lu, Shi-Feng; Han, Zhong; Xu, Luhua; Lan, Tian-gang; Wei, Xin; Zhao, Tengyuan

doi:10.1016/j.geoderma.2023.116509

Cited by 8 publications

(2 citation statements)

References 134 publications

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“…In this study, the variation in soil surface temperature explained the variation in CH 4 flux well (R2=0.52) (Figure 5). With seasonal changes, the decrease in soil moisture caused by warming leaded to increased soil permeability (Juc´a and Maciel, 2006;Lu et al, 2023), promoting the diffusion of CH 4 from the atmosphere into the deep soil and thereby enhancing CH 4 absorption. In a typical steppe in semiarid areas, the increase in water may not reach the threshold level that affects methanotrophs, hence no significant correlation between CH 4 flux and soil surface moisture was noted.…”

Section: Relationships Between Ch 4 and Environmental Factorsmentioning

confidence: 99%

Warming promoted CH4 absorption compared with precipitation addition in typical steppe in Inner Mongolia

Chen

Wan

et al. 2023

Front. Ecol. Evol.

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IntroductionClimate change, characterized by rising temperatures and changing precipitation patterns, has emerged as a significant global concern. Particularly, the warming potential of CH4 is 28 times greater than that of CO2, leading to an increased focus on its impact. Among various ecosystems, grasslands exhibit a high vulnerability to climate change. Grassland in Inner Mongolia is an important component of the typical grassland in Eurasian, and there was evidence that warmer and more precipitation in this area in future.MethodsIn this study, we utilized an open-top chamber (OTC) to conduct warming and precipitation experiments on a representative steppe located in Inner Mongolia in 2011. From 2017 to 2019, we monitored various factors, including soil temperature, moisture, CH4 flux, community characteristics, soil carbon nitrogen content. Subsequently, we analyzed the response of CH4 flux and its influencing factors to warming and precipitation in this typical steppe.ResultsThe soil in the typical steppe acted as a CH4 sink. In 2018, CH4 flux during the growing season and t during the non-growing season were −59.31 and −21.21 under C, −56.55 and −31.17 under T, −41.34 and −24.93 under P, −50.09 and −26.51 ug C·m−2·h−1 under TP respectively. Warming stimulated absorption of CH4 during the non-growing season (25.8%), while the addition of precipitation hindered CH4 absorption during the growing season (76.37%). Warming and precipitation addition decreased the percentage of CH4 absorbed in growing season and increased that in non-growing season which account 67.66% and 32.34% under C, 59.81% and 40.19% under T, 62.71% and 37.29% under P, 62.03% and 37.97% under TP respectively. Soil temperature exhibited a positive correlation with CH4 flux (P<0.001), while the dominance of Leymus chinensis (IV-L.c.) exhibited a negative correlation with CH4 flux (P<0.01). Moreover, NH4+-N displayed a positive correlation with CH4 flux (P<0.05).ConclusionThe findings suggest that CH4 absorption in a typical steppe may increase in a warmer future, and warming is conducive to the absorption of CH4 in the non-growing season. Not only abiotic factors had an impact on CH4 absorption, but also changes in community composition. Consequently, further exploration of the underlying mechanisms is warranted.

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Section: Relationships Between Ch 4 and Environmental Factorsmentioning

confidence: 99%

Warming promoted CH4 absorption compared with precipitation addition in typical steppe in Inner Mongolia

Chen

Wan

et al. 2023

Front. Ecol. Evol.

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“…Although it can measure the volume change of soil samples using a flexible wall cell and apply confining pressure, it still does not solve the problem of gas pressure fluctuation (15 kPa) [30][31][32][33][34]. Compared with the flexible wall permeameter, although the triaxial permeameter does not solve the problem of gas pressure fluctuation (3.2 kPa), it is widely used due to its high testing accuracy and the ability to apply confining pressure and principal pressure [35][36][37][38][39]. By developing a gas supply device with two Mariotte bottles [40] as the core component, Chen et al (2021) effectively addressed the gas pressure fluctuation under low pressures (20 kPa), simplified the measurement of gas flow velocity, and improved the gas pressure supply accuracy to 0.01 kPa [24].…”

Section: Introductionmentioning

confidence: 99%

A Temperature-Controlled Apparatus for Gas Permeability under Low Gas Pressure

Wu,

Huang,

Liu

et al. 2023

Applied Sciences

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The measurement of soil gas permeability is influenced by the temperature and pressure fluctuation in the low gas pressure region. In order to investigate these influences, a soil temperature-controlled apparatus connected to a low-gas-pressure supply equipment is proposed in this study. The low constant gas pressure is supplied by two Mariotte bottles, by which the airflow rate is measured. Meanwhile, the soil specimen is controlled by a temperature-controlled apparatus. During the test, the negative pore water pressure and volume change of the soil specimen are measured. Through the temperature-controlled apparatus, it is observed that as the temperature increases from 25 °C to 60 °C, there is a corresponding increase in soil sample porosity by 5.4%, while the negative pressure of pore water decreases by 11.1%. This can be attributed to the reduction in the surface tension of contractile skin caused by elevated temperatures. Furthermore, due to variations in gas viscosity with temperature, there was a significant decrease in the gas flow rate by 50.5%. And, the relationship between permeability and volumetric gas content at different temperatures in low-pressure regions well confirms the existing power-law model. In addition, the existence of a temperature-independent critical negative pore water pressure is observed, beyond which the intrinsic permeability remains constant. At 36 kPa of negative pore water pressure, the intrinsic permeability at 60 °C exhibits an 81.8% reduction compared to that at 25 °C. This decline in intrinsic permeability can be attributed to a diminished pore connectivity, resulting from elevated temperatures.

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Air permeability variation of compacted loess: effects of soil basic properties and dry-wet cycles

Lu,

Guo,

Wang

et al. 2024

Bull Eng Geol Environ

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On measuring methods and influencing factors of air permeability of soils: An overview and a preliminary database

Cited by 8 publications

References 134 publications

Warming promoted CH4 absorption compared with precipitation addition in typical steppe in Inner Mongolia

Warming promoted CH4 absorption compared with precipitation addition in typical steppe in Inner Mongolia

A Temperature-Controlled Apparatus for Gas Permeability under Low Gas Pressure

Air permeability variation of compacted loess: effects of soil basic properties and dry-wet cycles

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