Streamflow Variability Indicated by False Rings in Bald Cypress (Taxodium distichum (L.) Rich.)
Streamflow Variability Indicated by False Rings in Bald Cypress (Taxodium distichum (L.) Rich.)
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DOI：
10.3390/f11101100
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发表时间：
2020-10
期刊：
影响因子：
2.9
通讯作者：
M. Therrell;E. Elliott;M. Meko;J. Bregy;Clay S. Tucker;G. Harley;Justin T. Maxwell;G. Tootle
中科院分区：
文献类型：
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作者：
M. Therrell;E. Elliott;M. Meko;J. Bregy;Clay S. Tucker;G. Harley;Justin T. Maxwell;G. Tootle
尽管生长在潮湿的低地和河岸环境，紫杉（Taxodium distichum， L.）富有。白柏对水文气候变化有强烈的响应，白柏年轮年表已被广泛用于重建干旱、降水和河流。先前的研究也表明，秃柏树的假环似乎是生长季节水分可用性变化的结果。在这项研究中，来自美国佛罗里达州西北部Choctawhatchee河附近两个地点的28棵树被用来建立一个从1881年到2014年的假年轮记录。在可用仪器时代（1931-2014）记录了20个假环事件。这一记录与附近一个仪表的每日和每月流量数据进行了比较。在仪器期间记录的所有20个假环事件都发生在生长季节后期流量大幅增加的年份。许多这些潮湿事件似乎是由登陆的热带气旋造成的降雨造成的。我们还发现，年轮内假年轮的位置反映了河流流量的变化，将假年轮记录与树轮宽度年表相结合，可以使夏季总体流量的估计提高14%。未来使用这些和其他定量方法来识别和测量树木年轮中的假年轮变量的工作可能会改善河流的树木年轮重建，并可能改善热带气旋降雨事件的记录。
Despite growing in wet lowland and riparian settings, Taxodium distichum (L.) Rich. (bald cypress) has a strong response to hydroclimate variability, and tree ring chronologies derived from bald cypress have been used extensively to reconstruct drought, precipitation and streamflow. Previous studies have also demonstrated that false rings in bald cypress appear to be the result of variations in water availability during the growing season. In this study 28 trees from two sites located adjacent to the Choctawhatchee River in Northwestern Florida, USA were used to develop a false ring record extending from 1881 to 2014. Twenty false ring events were recorded during the available instrumental era (1931–2014). This record was compared with daily and monthly streamflow data from a nearby gage. All 20 of the false-ring events recorded during the instrumental period occurred during years in which greatly increased streamflow occurred late in the growing season. Many of these wet events appear to be the result of rainfall resulting from landfalling tropical cyclones. We also found that the intra-annual position of false rings within growth rings reflects streamflow variability and combining the false-ring record with tree ring width chronologies improves the estimation of overall summer streamflow by 14%. Future work using these and other quantitative approaches for the identification and measurement of false ring variables in tree rings may improve tree-ring reconstructions of streamflow and potentially the record of tropical cyclone rainfall events.