ABSTRACT Latewood ring widths of longleaf pine (Pinus palustris Mill.) growing on Carolina bay sand rims on the coastal plains of North Carolina are effective recorders of tropical cycone precipitation (TCP). Longleaf pine are hypothesized to be effective recorders of TCP because of their extensive lateral root structure that is exposed to enhanced soil moisture when TCP events raise the water table to root level, but this hypothesis has not been empirically tested. In this study, we used a combination of North Carolina Phase 1 LiDAR and high-precision georeferenced data to investigate the relationship between radial tree growth, TCP, and microelevation. Our findings suggest that the strength of correlations between latewood ring widths and TCP are positively correlated (p < 0.05) with tree elevation on Carolina bay sand rims, resulting in greater sensistivity of trees at higher elevations. These findings suggest that in some environments, microelevational differences (<1 m) may significantly affect climate/radial growth relationships and the use of high-resolution LiDAR technology may be an effective tool for better understanding the role of microtopography on radial growth patterns.

中文翻译：

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微海拔差异影响长叶松（Pinus palustris Mill。）对热带气旋降水的敏感性：使用激光雷达的案例研究

摘要 生长在北卡罗来纳州沿海平原的卡罗莱纳湾沙缘的长叶松（Pinus palustris Mill.）的晚材年轮宽度是热带气旋降水（TCP）的有效记录器。假设长叶松是 TCP 的有效记录器，因为当 TCP 事件将地下水位提高到根部水平时，它们广泛的侧根结构暴露于增强的土壤水分，但该假设尚未经过实证检验。在本研究中，我们结合北卡罗来纳州第一阶段 LiDAR 和高精度地理参考数据来研究径向树生长、TCP 和微高程之间的关系。我们的研究结果表明，晚材年轮宽度和 TCP 之间的相关强度与卡罗莱纳湾沙缘上的树木高度呈正相关（p < 0.05），导致较高海拔的树木具有更大的敏感性。这些发现表明，在某些环境中，微海拔差异（<1 m）可能会显着影响气候/径向生长的关系，高分辨率 LiDAR 技术的使用可能是更好地了解微地形对径向生长模式的作用的有效工具。