x = Clay content in soil (in gram per g/kg) y = Soil moisture at 10cm depth (in %) Data taken from 150 forest plots. Plots with missing data were excluded. The clay content in a soil is one determinant of how much water a soil can hold. Reference: Solly et al (2014). Factors controlling decomposition rates of fine root litter in temperate forests and grasslands. Plant and Soil, 382(1-2), 203-218. x --> y