Circulation of organic carbon in agro-ecosystems of different crop rotations

Abstract

The purpose. To determine normative parameters or model or a cycle of carbon in agro-eco-systems of different crop rotations at use of alternative kinds of organic fertilizers and to fix basic regularities of directedness of carbon cycle in conditions or modem climatic system or Forest steppe or Ukraine. Methods. Field, laboratory, estimation, mathematicalstatistical. Results. Between mass of Cogr in aocessory products and mass of Cogr, involved in the process of humification, the direct correlative dependence (R=0,94±0,05; R2=0,88) is installed; with mass of Cogr spent for mineralization, the direct connection in the order of straight linear dependence is fixed. Critical receipt is determined of Cogr from accessory products in the range of 40-70 l/hectare for year which meets minimum involving of carbon in the process of humificatian and maximal rales of mineralization and emission of CO2 in atmosphere. At importation of dung through mineralization in atmosphere on cumulative yield it is giving off in 3, 5 times less CO2 than at importation of accessory products. Conclusions. In agro-ecosystems of different crop rotations at use of accessory products as organic fertilizer scarce balance is formed of Cogr which value is diminished at transferring from7-10 field to 3-5 field crop rotations. That testifies to decrease of negative influence of CO2-factor and maybe considered as the proof of limitation of carbon nutrition at augmentation of productivity of cultures in agro-ecosystems. Under such circumstances vector of CO2-factor is directed aside positive values that promotes accumulations of organic carbon in major produce and organic soil, thus agro-ecosystems of crop rotations find properties of stock heat-sink systems.