Hi, I am now trying to relate the seasonal dynamics of microbial biomass (carbon and nitrogen), soil respiration (made in-situ) and SOC to the enzyme activities in different-aged forest at different depths. I am looking forward to suggestions on types of enzymes which could be better indicators of dynamic cycles of labile carbon and nitrogen. Tao Wang Department of Ecology College of environmental Sciences Peking university Beijing 100871 P.R.China Tel: 86-10-5276-2199 Email: [EMAIL PROTECTED]