5Decker K L M,Boemer R E J,Morris S J. Scale dependent patterns of soil enzyme activity in a forest landscape[J] .Canadian Journal of Forest Research, 1999,29(2):232-241.
6Edwards C. A. (ed). Biological Interaction in Soil, in Agriculture, Ecosystem and Environment [ M ]. London: Academic Press, 1988.24.
7Ebermayer E. Die qesamte Lehre der woldeteru mit Rucksicht auf die chemische static woldbaues[M]. Bertin:J Ulius Springer, 1875.115.
8Fyles JW. Fyles IH. Interaction of Douglas 2fir with red alder and salal foliage litter during decomposition [ J ]. Can. J. For.Res., 1993.23(3) :358-361.
9Blair JM. et al. Decay rates, nitrogen fluxes and decomposer communities of single and mixed species foliar litter[J]. Ecol,1990.71(5) : 1 976-1 985.
10Bohlen PJ. et al. Earthworm effects on carbon and mitrogen dynamics of surface litter in corn agroecosystems [ J ]. Ecol Appl.1997(4) : 1 341 - 1 349.
