Abstract Wood products, particularly whole, unprocessed logs, are a significant risk pathway for forest insect pests. Freshly harvested logs continue to respire, creating a high carbon dioxide (CO2), and low oxygen (O2) atmosphere in enclosed spaces. Such modified atmospheres may reduce the effectiveness of insect control treatments applied during the transit of logs, making it important to accurately quantify how the atmosphere is modified. We used gas chromatography to measure the amount of CO2 and O2 respired by radiata pine (Pinus radiata D.Don) logs under three temperatures (10, 15 and 20 °C) in airtight containers for 14 days to simulate real world conditions in a ship’s hold. We repeated the experiment across all seasons (i.e. spring, summer, autumn and winter). The atmosphere in the containers became severely hypoxic/hypercapnic (low O2/high CO2) by day five, and our study confirmed that temperature, time and season were significant factors influencing log respiration. Our results suggest that the atmosphere in a ship’s hold during the export of unprocessed wood products changes rapidly to hypoxic/hypercapnic conditions that are then maintained for weeks. This highlights a potential challenge for the effectiveness of insect control treatments during transit of logs, particularly treatments that require respiratory uptake of a toxin by insects.

中文翻译：

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未加工松木的呼吸作用会在封闭空间内造成严重的缺氧和高碳酸血症

摘要 木制品，尤其是未加工的原木，是森林害虫的重要风险途径。新收获的原木继续呼吸，在封闭空间中产生高二氧化碳 (CO2) 和低氧 (O2) 的气氛。这种改变的气氛可能会降低原木运输过程中应用的昆虫控制处理的有效性，因此准确量化气氛如何改变变得很重要。我们使用气相色谱法测量了辐射松（Pinus radiata D.Don）原木在密闭容器中在三种温度（10、15 和 20 °C）下呼吸的 CO2 和 O2 量 14 天，以模拟船舶的真实世界条件抓住。我们在所有季节（即春季、夏季、秋季和冬季）都重复了该实验。到第五天，容器中的空气变得严重缺氧/高碳酸血症（低 O2/高 CO2），我们的研究证实温度、时间和季节是影响对数呼吸的重要因素。我们的研究结果表明，在出口未加工的木制品期间，船舱内的气氛会迅速转变为低氧/高碳酸血症，然后维持数周。这突出了在原木运输过程中昆虫控制处理有效性的潜在挑战，特别是需要昆虫通过呼吸道吸收毒素的处理。我们的研究结果表明，在出口未加工的木制品期间，船舱内的气氛会迅速转变为低氧/高碳酸血症，然后维持数周。这突出了在原木运输过程中昆虫控制处理有效性的潜在挑战，特别是需要昆虫通过呼吸道吸收毒素的处理。我们的研究结果表明，在出口未加工的木制品期间，船舱内的气氛会迅速转变为低氧/高碳酸血症，然后维持数周。这突出了在原木运输过程中昆虫控制处理有效性的潜在挑战，特别是需要昆虫通过呼吸道吸收毒素的处理。