Agriculture, Ecosystems & Environment ( IF 6.0 ) Pub Date : 2024-01-09 , DOI: 10.1016/j.agee.2023.108878 Line Vinther Hansen , Andreas Brændholt , Azeem Tariq , Lars Stoumann Jensen , Leanne E.K. Peixoto , Søren O. Petersen , Sander Bruun
Upland terrestrial soils play a crucial role in the global methane (CH4) cycle, although their potential as sinks for CH4 remains inadequately quantified. This study investigated CH4 uptake rates spanning two full years at four locations representing typical soil types and crop rotations in Denmark. The sampling campaigns included a total of more than 5000 manual static chamber flux measurements. All locations were, on average, small net sinks for CH4 while displaying significant differences between locations ranging from −1.5±0.3 g CH4-C ha−1 day−1 on the loamy soils to −3.8±0.3 g CH4-C ha−1 day−1 on the sandy soil with the lowest bulk density. A significant negative effect of soil moisture on CH4 uptake was also identified across the locations. Therefore, this study highlights the importance of soil texture and moisture as key controlling variables for CH4 uptake and emphasizes the need for local estimates of sink capacity. Overall, there were no detectable effects of agricultural management practices and fertilisation events did not affect the CH4 flux except for some high emissions following cattle slurry application on coarse sandy soil, which needs some consideration.
中文翻译:
丹麦不同土壤类型和农业管理实践的甲烷吸收率
高地陆地土壤在全球甲烷 (CH 4 ) 循环中发挥着至关重要的作用,尽管其作为 CH 4汇的潜力仍未得到充分量化。本研究调查了代表丹麦典型土壤类型和作物轮作的四个地点整整两年的CH 4吸收率。采样活动总共包括 5000 多次手动静态室通量测量。平均而言,所有位置的 CH 4净汇均较小,而不同位置之间显示出显着差异,范围为壤土上的-1.5±0.3 g CH 4 -C ha -1 day -1至 -3.8±0.3 g CH 4 -C ha −1 day −1在容重最低的沙土上。在各个地点还发现土壤湿度对 CH 4吸收有显着的负面影响。因此,本研究强调了土壤质地和湿度作为 CH 4吸收关键控制变量的重要性,并强调了对汇容量进行局部估计的必要性。总体而言,没有可检测到的农业管理措施的影响,并且施肥事件不会影响CH 4通量,除了在粗沙土上施用牛粪后排放量较高之外,这需要一些考虑。