8Allison V, Condron L, Peltzer D A et al. Changes in enzyme activities and soil microbial community composition along carbon and nutrient gradients at the Franz Josef chronosequence, New Zealand [J]. Soil Biol. Biochem., 2007, 39: 1770-1781.
9Ajwa H A, Dell C J, Rice C W. Changes in enzyme activities and microbial biomass of tallgrass prairie soil as related to buming and nitrogen fertilization [J]. Soil Biol. Biochem., 1999, 31 : 769-777.
10Martens D A, Johanson J B, Frankenberger J W T. Production and persistence of soil enzymes with repeated addition of organic residues [J]. Soil Sci., 1992, 153: 53-61.