Doctoral Program in Sustainable Environmental Studies, Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan.
Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan.
Environ Sci Pollut Res Int. 2023 Aug;30(37):88180-88196. doi: 10.1007/s11356-023-28488-8. Epub 2023 Jul 12.
Agricultural activities contribute 7% to Sri Lanka's economy and account for 20% of the national greenhouse gas (GHG) emissions. The country aims to achieve zero net emissions by 2060. This study was aimed at assessing the present state of agricultural emissions and identifying mitigation strategies. The assessment involved estimating agricultural net GHG emissions from non-mechanical sources in the Mahaweli H region, Sri Lanka, in 2018 using the Intergovernmental Panel on Climate Change (IPCC 2019) guidelines. New indicators were developed to measure emissions for major crops and livestock and used to show the flow of carbon and nitrogen. The region's agricultural emissions were estimated to be 162,318 t COeq y, of which 48% was from rice field methane (CH) emissions, 32% from soil nitrogen oxide emissions, and 11% from livestock enteric CH emissions. Biomass carbon accumulation offset 16% of the total emissions. Rice crops exhibited the highest emission intensity of 4.77 t COeq ha y, while coconut crop had the highest abatement potential of 15.58 t COeq ha y. Approximately 1.86% of the carbon input to the agricultural system was released as carbon-containing GHG (CO and CH), whereas 1.18% of the nitrogen input was released as nitrous oxide. The findings of this study suggest extensive adaptations of agricultural carbon sequestration strategies and increased nitrogen use efficiency to achieve GHG mitigation targets. The emission intensity indicators derived from this study can be used for regional agricultural land use planning to maintain designated levels of emissions and implement low-emission farms.
农业活动为斯里兰卡的经济贡献了 7%，占国家温室气体（GHG）排放量的 20%。该国的目标是在 2060 年实现净零排放。本研究旨在评估农业排放现状并确定缓解策略。评估包括使用政府间气候变化专门委员会（IPCC 2019）指南估算 2018 年斯里兰卡 Mahaweli H 地区非机械源农业净 GHG 排放量。开发了新指标来衡量主要作物和牲畜的排放量，并用于显示碳和氮的流动。该地区的农业排放量估计为 162318 t COeq y，其中 48%来自稻田甲烷（CH）排放，32%来自土壤氮氧化物排放，11%来自牲畜肠道 CH 排放。生物质碳积累抵消了总排放量的 16%。水稻作物的排放强度最高，为 4.77 t COeq ha y，而椰子作物的减排潜力最高，为 15.58 t COeq ha y。大约 1.86%的农业系统碳输入以含碳 GHG（CO 和 CH）的形式释放，而 1.18%的氮输入以氧化亚氮的形式释放。本研究的结果表明，需要广泛采用农业碳封存策略和提高氮利用效率，以实现温室气体减排目标。本研究得出的排放强度指标可用于区域农业土地利用规划，以维持指定的排放水平并实施低排放农场。
