This is the peer reviewed version of the following article: Haas C, Gerke HH, Ellerbrock RH, Hallett PD, Horn R. Relating soil organic matter composition to soil water repellency for soil biopore surfaces different in history from two Bt horizons of a Haplic Luvisol. Ecohydrology. 2018;11:e1949, which has been published in final form at https://doi.org/10.1002/eco.1949. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.