College of Natural and Applied Sciences, University of Guam, Mangilao, Guam, USA.
Plant Collections Department, Nong Nooch Tropical Botanical Garden, Sattahip, Thailand.
Plant Signal Behav. 2020 Mar 3;15(3):1732661. doi: 10.1080/15592324.2020.1732661. Epub 2020 Feb 26.
The diel patterns of stem carbon dioxide efflux () were determined for cycads, monocots, and woody eudicot and gymnosperm tree species. Stem at a height of 30-40 cm was measured every 2 h throughout 31-h campaigns. Our range of was 1.5-4.0 µmol·m·s for cycads, 1.0-3.5 µmol·m·s for arborescent monocots, and 1.5-4.5 µmol·m·s for woody eudicot and gymnosperm trees species. Time of day did not influence of cycads or monocots. In contrast, the woody stems of eudicots and gymnosperms exhibited diurnal that was 36% to 40% greater than nocturnal . The established literature based on of woody tree species cannot be used to estimate habitat carbon cycles in habitats which contain cycad or monocot trees. Time of day must be included for accuracy of research on of woody tree species. Failures to account for the spatiotemporal differences of may explain some of the disparity in outcomes of published stem respiration studies.
测定了苏铁类植物、单子叶木本植物和木本真双子叶植物和裸子植物的茎二氧化碳释放（）的昼夜模式。在 31 小时的实验中，每隔 2 小时测量一次高度为 30-40 厘米的茎。我们的范围是苏铁类植物为 1.5-4.0µmol·m·s，木本单子叶植物为 1.0-3.5µmol·m·s，木本真双子叶植物和裸子植物为 1.5-4.5µmol·m·s。一天中的时间并不影响苏铁类植物或单子叶植物的。相比之下，真双子叶植物和裸子植物的木质茎表现出昼夜差异，白天比夜间高出 36%至 40%。基于木本植物的建立的文献不能用于估计含有苏铁或单子叶植物的栖息地的碳循环。为了准确研究木本植物的，必须包括一天中的时间。如果不考虑的时空差异，可能会解释一些已发表的茎呼吸研究结果的差异。
