Influence of Soil Organic Carbon on Greenhouse Gas Emission Potential After Application of Biogas Residues or Cattle Slurry:Results from a Pot Experiment  

作　　者：gawan heintze tim eickenscheidt urs schmidhalter matthias drsler 

机构地区：[1]university of applied sciences weihenstephan-triesdorf,Chair of Vegetation Ecology 85354,Freising(Germany) [2]technical university of munich,Chair of Plant Nutrition,85354 Freising(Germany)

出　　处：《Pedosphere》2017年第5期807-821,共15页土壤圈（英文版）

摘　　要：A change in the European Union energy policy has markedly promoted the expansion of biogas production. Consequently, large amounts of nutrient-rich residues are being used as organic fertilizers. In this study, a pot experiment was conducted to simulate the high-risk situation of enhanced greenhouse gas （GHG） emissions following organic fertilizer application in energy maize cultivation. We hypothesized that cattle slurry application enhanced CO2 and N20 fluxes compared to biogas digestate because of the overall higher carbon （C） and nitrogen （N） input, and that higher levels of CO2 and N20 emissions could be expected by increasing soil organic C （SOC） and N contents. Biogas digestate and cattle slurry, at a rate of 150 kg NH＋-N ha-1, were incorporated into 3 soil types with low, medium, and high SOC contents （Cambisol, Mollic Gleysol, and Sapric Histosol, termed Clow, Cmedium, and Chigh, respectively）. The GHG exchange （CO2, CH4, and N20） was measured on 5 replicates over a period of 22 d using the closed chamber technique. The application of cattle slurry resulted in significantly higher CO2 and N20 fluxes compared to the application of biogas digestate. No differences were observed in CH4 exchange, which was close to zero for all treatments. Significantly higher CO2 emissions were observed in Chigh compared to the other two soil types, whereas the highest N20 emissions were observed in Cmedium. Thus, the results demonstrate the importance of soil type-adapted fertilization with respect to changing soil physical and environmental conditions.A change in the European Union energy policy has markedly promoted the expansion of biogas production. Consequently, large amounts of nutrient-rich residues are being used as organic fertilizers. In this study, a pot experiment was conducted to simulate the high-risk situation of enhanced greenhouse gas(GHG) emissions following organic fertilizer application in energy maize cultivation.We hypothesized that cattle slurry application enhanced CO_2 and N_2O fluxes compared to biogas digestate because of the overall higher carbon(C) and nitrogen(N) input, and that higher levels of CO_2 and N_2O emissions could be expected by increasing soil organic C(SOC) and N contents. Biogas digestate and cattle slurry, at a rate of 150 kg NH_4^+-N ha^(-1), were incorporated into 3 soil types with low, medium, and high SOC contents(Cambisol, Mollic Gleysol, and Sapric Histosol, termed Clow, Cmedium, and Chigh, respectively). The GHG exchange(CO_2, CH_4, and N_2O) was measured on 5 replicates over a period of 22 d using the closed chamber technique. The application of cattle slurry resulted in significantly higher CO_2 and N_2O fluxes compared to the application of biogas digestate. No differences were observed in CH_4 exchange, which was close to zero for all treatments. Significantly higher CO_2 emissions were observed in Chigh compared to the other two soil types, whereas the highest N_2O emissions were observed in Cmedium. Thus, the results demonstrate the importance of soil type-adapted fertilization with respect to changing soil physical and environmental conditions.

关 键 词：C mineralization energy maize mineral soil N mineralization organic fertilization PEATLAND 

分 类 号：S141[农业科学—肥料学] S154.1[农业科学—农业基础科学]