Abstract Agricultural fields can be significant sources of carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4), with implications for climate change. This paper reports continuous half-hourly CO2, CH4 and N2O fluxes over a conventionally-managed highbush blueberry field on Westham Island in Delta, British Columbia (BC), Canada, measured using the eddy-covariance (EC) method for a 1-year period. Field management, including fertilization and mowing interrow grass, was associated with substantial changes in GHG exchange. With emissions of N2O and CH4 totaling 0.61 ± 0.03 g N2O m−2 year−1 and 0.81 ± 0.4 g CH4 m−2 year−1, corresponding to 182 ± 9 g and 30 ± 13 g CO2 equivalent (CO2e) m−2 year−1, respectively, based on their 100-year global warming potentials, the field was a net source of 840 ± 126 g CO2e m−2 year−1. The annual net ecosystem exchange of CO2 (NEEc) was the largest component of the GHG balance at 171 ± 28 g C m−2 year−1 (628 ± 104 g CO2 m−2 year−1), indicating the field was a net carbon (C) source. After accounting for inputs and outputs of C in sawdust and harvested fruit, respectively, the agroecosystem gained a net of 233 ± 88 g C m−2 year−1, primarily controlled by the application of sawdust mulch. Both soil temperature and soil moisture were important environmental factors controlling GHG emissions, which has implications for future feedback cycles and climate change. Our results suggest that agricultural management strategies can be targeted for GHG mitigation.

中文翻译：

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加拿大不列颠哥伦比亚省下弗雷泽河谷传统管理的高灌木蓝莓田的温室气体交换

摘要 农田可能是二氧化碳 (CO2)、一氧化二氮 (N2O) 和甲烷 (CH4) 的重要来源，会对气候变化产生影响。本文报告了加拿大不列颠哥伦比亚省 (BC) 三角洲韦瑟姆岛传统管理的高灌木蓝莓田的连续半小时 CO2、CH4 和 N2O 通量，使用涡度协方差 (EC) 方法测量了 1 年时期。田间管理，包括施肥和割草，与温室气体交换的实质性变化有关。N2O 和 CH4 的排放总量为 0.61 ± 0.03 g N2O m-2 year-1 和 0.81 ± 0.4 g CH4 m-2 year-1，对应于 182 ± 9 g 和 30 ± 13 g CO2 当量 (CO2e) m-2 year−1，分别基于其 100 年全球变暖潜能值，该场是 840 ± 126 g CO2e m−2 year−1 的净来源。CO2 的年度净生态系统交换 (NEEc) 是温室气体平衡的最大组成部分，为 171 ± 28 g C m−2 year−1（628 ± 104 g CO2 m−2 year−1），表明该领域是一个净碳（C）源。在分别计算锯末和收获水果中 C 的输入和输出后，农业生态系统获得了 233 ± 88 g C m−2 year−1 的净收益，主要由应用锯末覆盖物控制。土壤温度和土壤湿度都是控制温室气体排放的重要环境因素，这对未来的反馈循环和气候变化具有影响。我们的结果表明，农业管理战略可以针对温室气体减排。在分别计算锯末和收获水果中 C 的输入和输出后，农业生态系统获得了 233 ± 88 g C m−2 year−1 的净收益，主要由应用锯末覆盖物控制。土壤温度和土壤湿度都是控制温室气体排放的重要环境因素，这对未来的反馈循环和气候变化具有影响。我们的结果表明，农业管理战略可以针对温室气体减排。在分别计算锯末和收获果实中 C 的输入和输出后，农业生态系统获得了 233 ± 88 g C m−2 year−1 的净收益，主要受锯末覆盖物的应用控制。土壤温度和土壤湿度都是控制温室气体排放的重要环境因素，这对未来的反馈循环和气候变化具有影响。我们的结果表明，农业管理战略可以针对温室气体减排。