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Fig. 5.2.2.
Functional diversity as a function of the metabolic quotient qCO 2 (n= 3).
dynamics. We suggest that soil microbial community structure changes as a
result of the long-term organic or conventional farming and, furthermore,
suggest these changes to be the main reason for differences in decomposi-
tion of organic matter. The hypothesis that community stability increases
with an increase in diversity is confirmed by our results.
Organic farming systems comprise management practices that change
soil organic matter cycling processes. Since the strategies of fertilization and
plant protection are the main differences of the 'DOK' farming systems we
suggest these factors to be the driving variables for the changes observed
within the microbiota and in organic matter quality in soils from organic
and conventional farming systems.
References
Anderson, T.H. and Domsch, K.H. (1990) Application of eco-physiological
quotients ( q CO 2 and q D) on microbial biomasses from soils of different
cropping histories. Soil Biology and Biochemistry 22, 251-255.
Fließbach, A. and Mäder, P. (1997) Carbon source utilization by microbial
communities in soils under organic and conventional farming practice. In:
Insam, H. and Rangger, A. (eds) Microbial Communities - Functional Versus
Structural Approaches . Springer, Berlin, pp. 109-120.
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