Effects of Forage Rice Cultivation on Carbon and Greenhouse Gas Balances in a Rice Paddy Field

Atmosphere

Fumiaki Takakai¹  Masahiro Kobayashi¹  Kentaro Yasuda¹  Yoshihiro Kaneta¹  Takashi Sato¹ 

[1] Laboratory of Soil Science, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Aza Kaidobata-Nishi, Shimoshinjo Nakano, Akita 010-0195, Japan;

关键词: carbon dioxide;    livestock manure compost;    methane;    nitrous oxide;    organic matter decomposition;    whole-crop silage;   

DOI  :  10.3390/atmos9120504

来源: DOAJ

【 摘 要 】

The effects of conversion from staple rice to forage rice on carbon and greenhouse gas (GHG) balances in a paddy field were evaluated. A staple rice plot without the application of livestock manure compost (LMC, S − M plot) and forage rice plots with and without the application of LMC, derived mainly from cattle (2 kg−FW m⁻², F + M and F − M plots, respectively), were established. CH₄ and N₂O fluxes and CO₂ flux from a bare soil plot for organic matter decomposition (OMD) were measured. The carbon budget was calculated by subtracting the OMD, CH₄ emission, and harvested grain and straw (forage rice only) from the net primary production and LMC. The net GHG balance was calculated by integrating them as CO₂ equivalents. There were no significant differences in GHG flux among the plots. Compared to the carbon loss in the S − M plot, the loss increased by harvesting straw and was mitigated by LMC application. The net GHG emission in the F + M plot was significantly lower than that in other plots (1.78 and 2.63−2.77 kg CO₂-eq m⁻² year⁻¹, respectively). There is a possibility that GHG emissions could be suppressed by forage rice cultivation with the application of LMC.

【 授权许可】

Unknown