Balloni W and Favilli F. Effects of agricultural practices on the physical,chemical and biological properties of soils: Part I - Effect of some agricultural practices on the biological soil fertility. In: Scientific Basis for soil Protection in the European Community. Barth, H. and L\'Hermite, P. (eds). Elsevier ASP, Barking, Essex, 1987, 161- 179.
[4]
Brussaard L. An appraisal of the dutch programme on soil ecology of arable farming systems( 1985 - 1992) [J]. Agric Ecosystems Environ.1994,51: 1 -6.
[5]
Smith J L and Paul E A. The significance of soil microbial biomass estimations[M]. In: Soil biochemistry. Bollag, J M and Stotzky, G.(eds). Marcel Dekker, New York, 1990. 357 - 398.
[6]
Kennedy A C and Smith K L. Soil microbial diversity and the susta inability of agricultural soils[J]. Plant Soil, 1995, 170:75 - 86.
Gupta V V S R, Germida J J. Distribution of microbial biomass and its activity in soil aggregate size classes as affected by cultivation[J]. Soil Biol Biochem, 1988,20:777 - 786.
[10]
Lynch J M. Interactions between biological processes, cultivation and soil structure[J]. Plant Soil, 1984,76: 307 - 318.
[11]
Lynch J M, Bragg E. Microorganisms and soil aggregate stability[J].Advances in Soil Science, 1985, (2): 1 33 - 171.
[12]
Forster S M. Microbial aggregation of sand in an embryo dune system [J]. Soil Biol Biochem, 1979, 11: 537 - 543.
[13]
Venkateswarlu B, Ran A V. Distribution of microorganisms in stabilised and unstabilised sand dunes of the Indian desert[J]. Journal of Arid Environmeats, 1981, (3): 201 - 207.
[14]
Jenkinsin D S. The determination of microbial biomass carbon and nitrogen in soils. In Wilson JR. ed. Advances in Nitrogen Cyclingin Agricultural Ecosystems. C. A. B[C]. International Wallingford,1983. 368 - 386.
[15]
Andtesen T H, Dormsch K H. Carbon Assimiation and microbial activity in soil[J]. Z pflanzenermahr Bodenk, 1986, 49:377 - 382.
