The joint plot of NMDS ordination for enzyme activity per SOM. All replicate plots of each study site with samples taken in June, July, August and September in 2003, 2004 and 2005. The vectors of environmental variables with strongest correlation to ordination axes (r > |0.5|) are shown.

  Part of: Niemi M, Pöyry J, Heiskanen I, Uotinen V, Nieminen M, Erkomaa K, Wallenius K (2014) Variability of soil enzyme activities and vegetation succession following boreal forest surface soil transfer to an artificial hill. Nature Conservation 8: 1-25.