Effect of different fertilization modes on soil organic carbon sequestration in acid soils

摘要

A meta-analysis of 297 treatment data from the Vezaiciai Branch of the Lithuanian Research Centre for Agriculture and Forestry long-term field experiment published from 2006 to 2015 was used to characterize the changes in SOC under different fertilization treatments and residue management practices in Lithuania's acid soil. A meta-analysis was performed to quantify the relative annual change (RAC) of SOC content and the average RAC rate of SOC under four fertilization modes (farmyard manure (FYM) (40 t ha(-1))); alternative organic fertilizers (in the manure background (40 t ha(-1))); FYM (60 t ha(-1)); alternative organic fertilizers (in the manure background (60 t ha(-1))) in two soil backgrounds (naturally acid and limed soil). The average RAC under four fertilization modes was 1.46 g kg(-1) yr(-1), indicating that long-term fertilization had considerable SOC sequestration potential. Incorporation of alternative organic fertilizers in unlimed soil showed negative effects (-0.39 and -0.66 g kg(-1) yr(-1)) in the observed long-term experiment. The RAC in the limed soil with incorporated organic fertilizers (FYM and alternative organic fertilizers), compared to the control, and varied from 0.25 g kg(-1) yr(-1) in the treatment with incorporated alternative organic fertilizers (in the manure background (40 t ha(-1))) to 0.71 g kg(-1) yr(-1) in the soil with FYM (60 t ha(-1)). In this study, the average RAC rate of SOC under organic fertilization treatments in limed soil (5.07-6.54%) was longer than organic fertilization in unlimed soil (2.11-3.49%), which might be attributed to the application of organic manure that would result in a slow release of fertilizer efficiency. Our results indicate that the application of manure (40 or 60 t ha(-1)) showed the greatest potential for C sequestration in agricultural soil and produced the longest SOC sequestration duration.