9JOHNSON D, LEE J A, CAMPBELLI C D, LEAKE J R. Changes in soil microbial hiomass and microbial activities in response to 7 years simulated pollutant nitrogen deposition on a heath land grass land [J]. Environmental Pollution, 1998,103(2-3):239-250.
10CRIRIQUET S, FERRE E, FAMET A M, LE PETIT. Annual dynamics of phosphatase activities in an evergreen oak litter: influence of biotic and abiotic factors [J]. Soil Biology and Biochemistry. 2004,36 (7): 1111-1118.