Division of Applied Life Science (BK 21+ Program), Gyeongsang National University, Jinju 52828, South Korea.
Division of Applied Life Science (BK 21+ Program), Gyeongsang National University, Jinju 52828, South Korea; Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 52828, South Korea.
Sci Total Environ. 2021 Mar 20;761:143193. doi: 10.1016/j.scitotenv.2020.143193. Epub 2020 Oct 29.
To increase soil carbon (C) stock, cover crop cultivation during the fallow season and its biomass incorporation as green manure (GM) is strongly suggested in mono-rice paddy. On the other hand, biomass application can highly increase greenhouse gas (GHG) emission, in particular methane (CH) during irrigated cropping season. Aerobic short pre-digestion of biomass applied soils was very effective to suppress CH emission. However, its effect on other GHG (CO and NO) emissions was not clear. To assess the integrated influence of aerobic short pre-digestion of green manured soils on global warming impact, cover crop biomass as GM was amended with different time interval before flooding (0-30 days) and aerobically decomposed under upland condition. Aerobic short pre-digestion over 10 days significantly decreased seasonal CH flux, but did not affect NO emission. As aerobic pre-digestion days became longer, net ecosystem C balance (NECB) which implies the difference between C input and output was slightly increased, but not statistically different. The net primary productivity of rice plant as a C input source was not significantly differentiated by aerobic short pre-digestion. As a C output source, the respired C loss that was composed with CO-C and CH-C emission was not considerably discriminated among 0-30 days of aerobic short pre-digestion. As a consequence, due to big reduction of CH emission, aerobic short pre-digestion significantly decreased net GWP which means integration of seasonal CH and NO fluxes and NECB as CO equivalent. In conclusion, aerobic short pre-digestion of biomass applied soil could be a sustainable management practice to decrease GHG emission impact without SOC stock change in temperate rice paddy field.
为了增加土壤碳（C）储量，在休耕期种植覆盖作物，并将其生物量作为绿肥（GM）还田是单季稻田的强烈建议。另一方面，生物质的应用会在灌溉种植季节大量增加温室气体（GHG）排放，特别是甲烷（CH）。对施用于土壤的生物质进行有氧短时间预消化非常有效地抑制 CH 排放。然而，其对其他 GHG（CO 和 NO）排放的影响尚不清楚。为了评估有氧短时间预消化绿肥土壤对全球变暖影响的综合影响，将不同时间间隔（0-30 天）前进行淹水和在旱地条件下有氧分解的覆盖作物生物量作为 GM 进行了添加。10 天以上的有氧短时间预消化显著降低了季节性 CH 通量，但对 NO 排放没有影响。随着有氧预消化天数的延长，净生态系统 C 平衡（NECB）略有增加，这意味着 C 输入和输出之间的差异，但没有统计学差异。作为 C 输入源的水稻植株的净初级生产力没有受到有氧短时间预消化的显著影响。作为 C 输出源，组成 CO-C 和 CH-C 排放的呼吸 C 损失在 0-30 天的有氧短时间预消化中没有明显区分。因此，由于 CH 排放的大量减少，有氧短时间预消化显著降低了净 GWP，这意味着整合了季节性 CH 和 NO 通量以及作为 CO 当量的 NECB。总之，在不改变温带稻田 SOC 储量的情况下，对施用于土壤的生物质进行有氧短时间预消化可以是减少 GHG 排放影响的可持续管理实践。
