How significant is nocturnal sap flow?
How significant is nocturnal sap flow?
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DOI：
10.1093/treephys/tpu051
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发表时间：
2014-07-01
期刊：
影响因子：
4
通讯作者：
Forster, Michael A.
中科院分区：
文献类型：
--
作者：
Forster, Michael A.
夜间液流（Q（n））已被发现发生在许多类群，季节和生物群落。对于Q（n）的发生量以及它是否对每日总液流（Q）有重要贡献，目前还没有普遍的理解。文献和未发表的数据的合成，以确定如何显着的是Q（n），作为Q（%Q（n））的比例，跨季节，生物群系，系统发育组和不同的测温液流方法。共分析了98个物种，发现%Q（n），平均为12.03%，最高的平均数据集为69.00%。冬季的% Q（n）显著小于其它温带季节，而丰水期的% Q（n）显著小于枯水期。赤道和热带生物群系的% Q（n）显著高于暖温带和热带生物群系。热比率法（HRM）和热耗散（TDP）法的% Q（n）显著高于热平衡法。HRM和TDP之间的其他分析发现，HRM在冬季，雨季和各种生物群落中具有显着较高的% Q（n）。在246个案例中，除了一个案例之外，所有案例都出现了Q（n），表明Q（n）是重要的，需要在树干液流和相关研究中仔细考虑。
Nocturnal sap flow (Q(n)) has been found to occur across many taxa, seasons and biomes. There is no general understanding as to how much Q(n) occurs and whether it is a significant contribution to total daily sap flow (Q). A synthesis of the literature and unpublished data was made to determine how significant is Q(n), as a proportion of Q (%Q(n)), across seasons, biomes, phylogenetic groups and different thermometric sap flow methods. A total of 98 species were analysed to find that %Q(n), on average, was 12.03% with the highest average dataset of 69.00%. There was significantly less % Q(n) in winter than in other temperate seasons, and significantly less % Q(n) in the wet season than in the dry season. The equatorial and tropical biomes had significantly higher % Q(n) than the warm temperate and nemoral biomes. The heat ratio method (HRM) and the thermal dissipation (TDP) method had significantly higher % Q(n) than the heat balance method. Additional analysis between HRM and TDP found HRM to have significantly higher % Q(n) in winter, wet season and various biomes. In all but one out of 246 cases Q(n) occurred, demonstrating that Q(n) is significant and needs to be carefully considered in sap flow and related studies.