Evaluation of a crop rotation with biological inhibition potential to avoid N_(2)O emissions in comparison with synthetic nitrification inhibition  

作　　者：Adrián Bozal-Leorri Mario Corrochano-Monsalve Luis M.Arregui Pedro M.Aparicio-Tejo Carmen González-Murua 

机构地区：[1]Department of Plant Biology and Ecology,University of the Basque Country(UPV/EHU),Apdo.644,E-48080,Bilbao 48940,Spain [2]Institute for Innovation and Sustainable Development in Food Chain(ISFOOD),Public University of Navarre,Pamplona 31006,Spain [3]Institute for Multidisciplinary Research in Applied Biology(IMAB),Public University of Navarre,Pamplona 31006,Spain

出　　处：《Journal of Environmental Sciences》2023年第5期222-233,共12页环境科学学报（英文版）

基　　金：supported by the Spanish Government(RTI2018-094623-B-C21 and C22 MCIU/AEI/FEDER,UE);the Basque Government(IT-932-16).Dr.Adrian Bozal-Leorri held a grant from the Basque Government(PRE-2020-2-0142);Dr.Mario Corrochano-Monsalve held a grant from the Ministry of Economy and Business of the Spanish Government(BES-2016-076725).

摘　　要：Agriculture has increased the release of reactive nitrogen to the environment due to crops’low nitrogen-use efficiency(NUE)after the application of nitrogen-fertilisers.Practices like the use of stabilized-fertilisers with nitrification inhibitors such as DMPP(3,4-dimethylpyrazole phosphate)have been adopted to reduce nitrogen losses.Otherwise,cover crops can be used in crop-rotation-strategies to reduce soil nitrogen pollution and benefit the following culture.Sorghum(Sorghum bicolor)could be a good candidate as it is drought tolerant and its culture can reduce nitrogen losses derived from nitrification because it exudates biological nitrification inhibitors(BNIs).This work aimed to evaluate the effect of fallow-wheat and sorghum cover crop-wheat rotations on N_(2)O emissions and the grain yield of winter wheat crop.In addition,the suitability of DMPP addition was also analyzed.The use of sorghum as a cover crop might not be a suitable option to mitigate nitrogen losses in the subsequent crop.Although sorghum–wheat rotation was able to reduce 22%the abundance of amoA,it presented an increment of 77%in cumulative N_(2)O emissions compared to fallow–wheat rotation,which was probably related to a greater abundance of heterotrophic-denitrification genes.On the other hand,the application of DMPP avoided the growth of ammonia-oxidizing bacteria and maintained the N_(2)O emissions at the levels of unfertilized-soils in both rotations.As a conclusion,the use of DMPP would be recommendable regardless of the rotation since it maintains NH_(4)^(+)in the soil for longer and mitigates the impact of the crop residues on nitrogen soil dynamics.

关 键 词：FALLOW SORGHUM Crop rotation Nitrification inhibitor N-cycling genes Soil mineral nitrogen 

分 类 号：S344.1[农业科学—作物栽培与耕作技术] X144[农业科学—农艺学]