Fig. 2. (a) Nitrous oxide and (b) CH₄ flux (mean of n = 6 and standard deviation) and (c) water-filled pore space (WFPS) at 5- to 10-cm depth in the trafficked soil (TS_M) and in the control (uncompacted soil) at the Holzerode site (sandy loam) from April 1999 to March 2000.