Moisture control over atmospheric CH4 consumption and CO2 production in diverse Alaskan soils

摘要: Abstract Moisture is an important control on atmospheric CH 4 consumption and CO 2 production in soil. Wet conditions limit these microbial activities by restricting O diffusion dry activity due to physiological water stress. We examined the relationship between soil moisture biogeochemical five Alaskan soils with varying physical properties. Three expressions of moisture, absolute content (g H O g −1 soil), potential percent water-holding capacity (%WHC), were compared for their abilities predict different soils. also responses oxidizers general community changes potential. The quantitative varied widely among textures. was asymmetrical differed upland wetland In contrast, parabolic %WHC symmetrical similar related similarly across Maximum occurred 20–40% WHC all a mean optimum 34% WHC, whereas maximal above 50% WHC. For oxidation, −0.3 −0.2 MPa soils, about −0.02 MPa Our results demonstrate that powerful expression quantitatively relating physically diverse may be useful modeling response processes, especially consumption, climate change. data suggest are adapted growth taiga decreased altered regardless whether become wetter or drier.