Department of Environment, Soils and Land Use, Teagasc, Johnstown Castle, Wexford, Ireland; Department of Botany, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland.
Department of Agrifood Business and Spatial Analysis, Rural Economy & Development Programme, Teagasc, Ashtown Research Centre, Dublin 12, Ireland.
Sci Total Environ. 2022 Jan 20;805:150342. doi: 10.1016/j.scitotenv.2021.150342. Epub 2021 Sep 15.
It has been suggested that the sequestration of CO by agricultural soils offers a means to reduce atmospheric greenhouse gas (GHG) concentrations and in turn mitigate the impacts of climate change. Carbon sequestration by grassland soils, which account for more than 60% of agricultural land use in Ireland, could contribute to a successful net reduction of atmospheric GHG emissions in accordance with the COP21 Paris Agreement. However, current estimates of soil carbon sequestration are variable and it is likely that many permanent grasslands are close to saturation. A literature search shows that soil carbon sequestration is enhanced by a variety of different management strategies, although one option that has only been examined to date in New Zealand is full inversion tillage (FIT) during grassland renovation. FIT involves inverting topsoil, generally to depths of 30 cm, resulting in the movement of C-deficient subsoil to the surface and the burying of carbon-rich topsoil. In this review, we hypothesise that over the next ~30 years the new topsoil could incorporate large amounts of soil organic carbon (SOC) from the re-seeded sward vegetation and that the buried carbon will be retained. We assess the current capability of Irish grassland soils to sequester carbon and suggest a potential role of FIT during grassland renovation. An analysis of the distribution of grasslands in Ireland using the Land Parcel Identification System (LPIS) suggests that ~26% of Ireland's agricultural grasslands are suitable for FIT.
有人认为，农业土壤对 CO 的隔离提供了一种减少大气温室气体（GHG）浓度的方法，从而减轻气候变化的影响。占爱尔兰农业用地 60%以上的草原土壤的碳隔离，可以根据《联合国气候变化框架公约》第 21 次缔约方会议（COP21）巴黎协定，有助于成功减少大气 GHG 排放。然而，目前对土壤碳隔离的估计是可变的，很可能许多永久性草原已经接近饱和。文献检索表明，土壤碳隔离受到各种不同管理策略的增强，尽管迄今为止在新西兰仅检查了一种选择，即草原更新期间的全面反转耕作（FIT）。FIT 涉及翻转表土，通常深度为 30 厘米，导致 C 缺乏的底土移动到表面，富碳表土被掩埋。在这篇综述中，我们假设在接下来的 30 年左右，新的表土可以从重新播种的草皮植被中吸收大量土壤有机碳（SOC），并且掩埋的碳将被保留。我们评估了爱尔兰草原土壤固碳的当前能力，并提出了在草原更新期间采用 FIT 的潜在作用。使用土地包裹识别系统（LPIS）对爱尔兰草原分布的分析表明，爱尔兰约 26%的农业草原适合采用 FIT。
