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Nutrient cycling and greenhouse gas emissions from soil amended with biochar-manure mixtures

Pedosphere 2021年第2期31卷 289-302页

作者： Carlos M.ROMERO Chunli LI Jen OWENS Gabriel O.RIBEIRO Tim A.MCALLISTER Erasmus OKINE Xiying HAO Agriculture and Agri-Food Canada Lethbridge Research and Development CentreLethbridgeAlberta T1J 4B1(Canada) Department of Biological Sciences Faculty of Arts&SciencesUniversity of LethbridgeLethbridgeAlberta T1K 3M4(Canada) Department of Animal and Poultry Science University of SaskatchewanSaskatoonSaskatchewan S7N 5A8(Canada)

Integrating biochar into cattle diets has recently emerged as a potential management practice for improving on-farm ***,information concerning the cycling of biochar-manure mixtures is scarce.A 70-d incubation experiment was conducted within two surface(0–15 cm)Mollisols with contrasting textures,i.e.,sandy clay loam(Raymond)and clayey(Lethbridge),to evaluate the effects of biochar(3 Mg ha^(-1))on cumulative greenhouse gas(GHG)emissions and related fertility attributes in the presence or absence of cattle manure(120 Mg ha^(-1)).Five treatments were included:i)non-amended soil(control,CK),ii)soil amended with pinewood biochar(B),iii)soil amended with beef cattle manure(M)(manure from cattle on a control diet),iv)soil amended with biochar-manure(BM)(manure from cattle on a control diet,with pinewood biochar added at 20 g kg^(-1)of diet dry matter),and v)soil amended with B and M at the aforementioned rates(B+M).A total of 40 soil columns were prepared and incubated at 21℃and 60%–80%water-holding *** average,total CO_(2)fluxes increased by 2.2-and 3.8-fold under manure treatments(i.e.,M,BM,and B+M),within Raymond and Lethbridge soils,respectively,relative to CK and ***,total CH4 fluxes were the highest(P<0.05)in Raymond soil under B+M and BM relative to CK and B,and in Lethbridge soil under M and BM relative to CK and *** Lethbridge soil,application of BM increased cumulative N_(2)O emissions by 1.8-fold relative to *** 70-d incubation,amendment with BM increased(P<0.05)PO_4-P and NO_3-N+NH_4-N availability in Raymond and Lethbridge soils compared with B.A similar pattern was observed for water-extractable organic carbon in both soils,with BM augmenting(P<0.05)the occurrence of labile carbon over CK and *** can be concluded that biochar,manure,and/or biochar-manure have contrasting short-term effects on the biogeochemistry of *** relatively low application rates,biochar does not necessarily counterbalance manure-derived inpu

关键词： animal husbandry black carbon carbon dioxide methane orthic black chernozem soil fertility

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