Sisal (Agave sisalana) is a climate-resilient crop grown on large-scale farms in semi-arid areas. However, no studies have investigated soil greenhouse gas (GHGs: CO₂, N₂O and CH₄) fluxes from these plantations and how they relate to other land cover types. We examined GHG fluxes (Fs) in a sisal chronosequence at Teita Sisal Estate in southern Kenya. The effects of stand age on Fs were examined using static GHG chambers and gas chromatography for a period of one year in seven stands: young stands aged 1–3 years, mature stands aged 7–8 years, and old stands aged 13–14 years. Adjacent bushland served as a control site representing the surrounding land use type. Mean CO₂ fluxes were highest in the oldest stand (56 ± 3 mg C m^-2 h^-1) and lowest in the 8-year old stand (38 ± 3 mg C m^-2 h^-1), which we attribute to difference in root respiration between the stand. All stands had 13–28% higher CO₂ fluxes than bushland (32 ± 3 mg C m^-2 h^-1). CO₂ fluxes in the wet season were about 70% higher than dry season across all sites. They were influenced by soil water content (W_S) and vegetation phenology. Mean N₂O fluxes were very low (<5 µg N m^-2 h^-1) in all sites due to low soil nitrogen (N) content. About 89% of CH₄ fluxes were below the detection limit (LOD ± 0.02 mg C m^-2 h^-1). Our results imply that sisal plantations have higher soil CO₂ emissions than the surrounding land use type, and the seasonal emissions were largely driven by W_S and the vegetation status. Methane and nitrous oxide are of minor importance. Thus, soil GHG fluxes from sisal plantations are a minor contributor to agricultural GHG emissions in Kenya.

剑麻（Agave sisalana）是一种在半干旱地区的大型农场上生长的耐气候作物。但是，没有研究调查过这些人工林的土壤温室气体（GHG：CO ₂，N ₂ O和CH ₄）通量及其与其他土地覆盖类型的关系。我们在肯尼亚南部的Teita Sisal Estate的剑麻时序中检查了温室气体通量（Fs）。林分年龄对Fs的影响使用静态温室气体箱和气相色谱法对七个林分进行了为期一年的检查：年龄为1-3岁的幼林，成熟的年龄为7-8岁的林分，以及年龄为13-14岁的林分。毗邻的灌木丛作为控制场地，代表了周围土地的使用类型。在最老的林分中平均CO 2通量最高（56±3 mg C m ^-2 h ^-1），而在8年龄的林中平均通量最低（38±3 mg C m ^-2 h ^-1），这归因于差异站在根部之间呼吸。所有林分的CO 2通量均高于灌木林（32±3 mg C m ^-2 h ^-1）。一氧化碳₂在所有地点，雨季的通量比旱季高约70％。他们被土壤含水量（影响W¯¯_小号）和植物物候。由于土壤氮（N）含量低，所有地点的平均N ₂ O通量都非常低（<5 µg N m ^-2 h ^-1）。约89％的CH ₄通量低于检测极限（LOD±0.02 mg C m ^-2 h ^-1）。我们的结果表明，剑麻人工林的土壤CO ₂排放量高于周围的土地利用类型，季节性排放量主要由W _S驱动和植被状况。甲烷和一氧化二氮的重要性不高。因此，剑麻人工林的土壤温室气体通量对肯尼亚农业温室气体排放的贡献很小。