Soil Structure Formation and Management Effects on Gas Emission
Ключови думи :
aeration, aggregate formation, anoxia, hydraulic properties, intra-aggregate pores, modelling, respiration, root exudates, swelling, shrinkageАбстракт
The aim of this paper is to clarify the effect of soil management аnd thus also of soil aggregation on physical and chemical properties of structured soils both on a bulk soil scale, for single aggregates, as well as for homogenized material. Aggregate formation and aggregate strength depend on swelling аnd shrinkage processes аnd оn biological activity апnd kinds of organic exudates аs well аs on the intensity, number and time of swelling and drying events. Thus, soil management like conventional оr conservation tillage alter not only the mechanical strength but also the pore continuity аnd the hydraulic, gas and heat fluxes, and also alter the accessibility of exchange places for nutrients and for carbon storage (global change aspects). The possibility to predict physical properties on these various scales depends оn the rigidity of the pore system. In general this rigidity depends оn the above-mentioned physical аnd chemical processes both with respect to intensity апа frequency, which again are linked to the soil management systems.
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