Management practices of Miscanthus × giganteus strongly influence soil properties and N2O emissions over the long term.

摘要: Cropping practices of Miscanthus × giganteus, a promising energy crop, can influence C and N cycles therefore potentially affect N2O emissions. They may vary in harvesting date, either early (EH) or late harvest (LH), the fertiliser form (NH4 NO3). In this study, we combined long-term field experiment simulations with STICS model to investigate effect these on soil parameters, emissions contribution nitrification denitrification. Daily fluxes parameters were measured during 4-month period following fertilisation 2014 2015. Mean cumulative markedly higher LH than EH (4.21 vs. 0.89 kg N2O–N ha−1 year−1) but did not differ significantly between forms years. The difference was mainly attributed water-filled pore space (WFPS) observed (80 56 % EH) which resulted itself from leaf mulch present EH. WFPS explained 67 variance large decrease pH after NH4 stimulated probably through less-efficient reduction N2 as simulated by STICS. Model outputs suggest dominant denitrification LH. Our study highlights crucial impact management practises crops changes physico-chemical processes short long term brings knowledge required maximise benefits bioenergy crops.