期刊
BIOENERGY RESEARCH
卷 12, 期 3, 页码 484-496出版社
SPRINGER
DOI: 10.1007/s12155-019-10001-0
关键词
Sugarcane trash; Organic waste; Pig slurry; Sewage sludge; GHG emissions; Nitrogen
资金
- SOERE PRO Project (Systeme d'observation et d'experimentation sur le long terme pour la recherche en environnement/long-term observation and experimentation systems for environmental research on organic waste products)
- INRA (Institut National de la Recherche Agronomique/National Institute of Agricultural Research)
- CIRAD (Centre de cooperation internationale en recherche agronomique pour le developpement/French agricultural research center for international development)
- ADEME (Agence de l'environnement et de la maitrise de l'energie/French environment and energy management agency)
- Universite de la Reunion
- Runeo (Veolia group)
Using organic fertilizers on sugarcane mulches is a potentially interesting substitute for mineral fertilization in terms of economic and environmental impacts. However, no general agreement exists regarding the short-term effect of combining mulching and organic fertilization on greenhouse gas (GHG) emissions. Therefore, we studied different mixtures in the field by combining two amounts of sugarcane mulch (5 and 10 Mg ha(-1)) with different N fertilizers (urea, pig slurry, and digested sewage sludge). We measured CO2 and N2O emissions shortly after application of the mixtures (0-14 days) and the mulch decomposition dynamics from 0 to 120 days after application. We hypothesized that the relative amount of N to C modifies the decomposition dynamics and GHG fluxes. The emitted N2O-N and CO2-C were measured using static chambers. Mulch-C decomposition was measured using litterbags. Our results showed that the proportion of mulch-C remaining on the soil on day 120 was not altered by either the type of N fertilizer or the mulch amount. On a shorter time scale (0-49 days), the different N treatments affected the mulch-C and mulch-N losses and the C:N ratios, indicating a transient interaction between the dynamics of the mulch and the added N. The intensity of N2O-N emission was ranked as pig slurry > urea > digested sewage sludge, underscoring the effect of the physical form of N fertilizer. This work highlights the need to jointly study carbon and nitrogen dynamics and consider both soil carbon and gas emissions to assess the GHG balances of sugarcane farming practices.
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