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• W2276670667 abstract "Management options such as the intensity of tillage are known to influence the turnover dynamics of soil organic matter. However, less information is available about the influence of the tillage intensity on individual soil organic matter pools of different turnover dynamics in surface and subsurface soils. This study aimed to analyze the impact of no tillage (NT), reduced tillage (RT), and conventional tillage (CT) on labile (mean residence time 100 years) C and N pools in surface soils compared to subsurface soils. We took surface (0-5 cm) and subsurface (5-25 cm) soil samples from NT, RT, and CT tillage systems of four long-term field experiments in Germany. The labile, intermediate and passive C and N pool sizes were determined based on the combined application of a decomposition experiment (~ 1 year) and a physical-chemical separation procedure. For the surface soils, we found higher stocks of the labile C and N pool under NT (C: 1.8 t ha, 2 Impact of tillage intensity on carbon and nitrogen pools in surface and subsurface soils of four long-term field experiments 12 N: 170 kg ha) compared to CT (C: 0.4 t ha, N: 60 kg ha). In contrast, we detected significantly higher stocks of the labile C pool under CT (C: 2.7 t ha) compared to NT (2 t ha) and RT (1.9 t ha) for the subsurface soils. Most of C and N were located in the intermediate pool and accounted for 73 to 85% of the C stocks and for 70% to 95% of the N stocks for the surface and subsurface soils. However, only for the surface soils, the stocks of the intermediate N pool were affected by the tillage intensity and distinctly larger for NT than for CT. The stocks of the passive C and N pool were not affected by the tillage intensity but were positively correlated to the stocks of the clay size fraction and oxalate soluble Al indicating a strong influence of site specific mineral characteristics on the size of these pools. Our results imply soil depth specific variations in the response of organic matter pools to tillage of different intensity. This indicates that the potential benefits of decreasing tillage intensity with respect to soil functions that are closely related to organic matter dynamics have to be evaluated separately for surface and subsurface soils. 2." @default.
• W2276670667 created "2016-06-24" @default.
• W2276670667 creator A5048598536 @default.
• W2276670667 date "2013-11-29" @default.
• W2276670667 modified "2023-09-27" @default.
• W2276670667 title "Effects of tillage intensity on soil C, N, and P pools with different stability" @default.
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