N2O and CH4 emission from Miscanthus energy crop fields in the infertile Loess Plateau of China

Abstract

BackgroundThe greenhouse gas (GHG) mitigation is one of the most important environmental benefits of using bioenergy replacing fossil fuels. Nitrous oxide (N2O) and methane (CH4) are important GHGs and have drawn extra attention for their roles in global warming. Although there have been many works of soil emissions of N2O and CH4 from bioenergy crops in the field scale, GHG emissions in large area of marginal lands are rather sparse and how soil temperature and moisture affect the emission potential remains unknown. Therefore, we sought to estimate the regional GHG emission based on N2O and CH4 releases from the energy crop fields.ResultsHere we sampled the top soils from two Miscanthus fields and incubated them using a short-term laboratory microcosm approach under different conditions of typical soil temperatures and moistures. Based on the emission measurements of N2O and CH4, we developed a model to estimate annual regional GHG emission of Miscanthus production in the infertile Loess Plateau of China. The results showed that the N2O emission potential was 0.27 kg N ha−1 year−1 and clearly lower than that of croplands and grasslands. The CH4 uptake potential was 1.06 kg C ha−1 year−1 and was slightly higher than that of croplands. Integrated with our previous study on the emission of CO2, the net greenhouse effect of three major GHGs (N2O, CH4 and CO2) from Miscanthus fields was 4.08 t CO2eq ha−1 year−1 in the Loess Plateau, which was lower than that of croplands, grasslands and shrub lands.ConclusionsOur study revealed that Miscanthus production may hold a great potential for GHG mitigation in the vast infertile land in the Loess Plateau of China and could contribute to the sustainable energy utilization and have positive environmental impact on the region.Electronic supplementary materialThe online version of this article (10.1186/s13068-018-1320-8) contains supplementary material, which is available to authorized users.

Miscanthus: A fast‐growing crop for environmental remediation and biofuel production

“…Miscanthus planting significantly reduces the release of N 2 O and increase the absorbing capacity of CH 4 in soil. The net release of three primary greenhouse gases (N 2 O, CH 4 , and CO 2 ) is estimated to reduce to an extent of 4.08 t CO 2 ‐eq per hectare per year (Mi et al., 2018). If we divert to grow Miscanthus on the grassland, soil carbon sequestration would be of significant difference in the long run (Holder et al., 2019).…”

Phytotechnology with Biomass Production

“…Miscanthus significantly reduces the release of NO x and increases the absorbing capacity for CH 4 . The net release of greenhouse gases was reduced to an extent of 4.08 t CO 2 -eq per hectare per year (Mi et al, 2018).…”

Development of energy plants from hybrids between Miscanthus sacchariflorus and M. lutarioriparius grown on reclaimed mine land in the Loess Plateau of China

“…As a C4 perennial grass with high nutrient and water use efficiencies, Miscanthus can be grown on the marginal land in the cool climate without heavy irrigation or fertilization (Yan et al, 2012). In addition, growing Miscanthus has a lot of environmental benefits, including soil and water conservation, carbon sequestration and soil restoration in the marginal land (Liu et al, 2014;Mi et al, 2014;Jezowski et al, 2017;Mi et al, 2018). Furthermore, the strong resistance to low temperature has also been reported in Miscanthus species (Fonteyne et al, 2016).…”