Clanwilliam cedar (Widdringtonia cedarbergensis; WICE), a long-lived conifer with distinct tree rings in Cape Province, South Africa, has potential to provide a unique high-resolution climate proxy for southern Africa. However, the climate signal in WICE tree-ring width (TRW) is weak and the dendroclimatic potential of other WICE tree-ring parameters therefore needs to be explored. Here, we investigate the climatic signal in various tree-ring parameters, including TRW, Minimum Density (MND), Maximum Latewood Density (MXD), Maximum Latewood Blue Intensity (MXBI), and stable carbon and oxygen isotopes (δ¹⁸O and δ¹³C) measured in WICE samples collected in 1978. MND was negatively influenced by early spring (October-November) precipitation whereas TRW was positively influenced by spring November-December precipitation. MXD was negatively influenced by autumn (April-May) temperature whereas MXBI was not influenced by temperature. Both MXD and MXBI were negatively influenced by January-March and January-May precipitation respectively. We did not find a significant climate signal in either of the stable isotope time series, which were measured on a limited number of samples. WICE can live to be at least 356 years old and the current TRW chronology extends back to 1564 CE. The development of full-length chronologies of alternative tree-ring parameters, particularly MND, would allow for an annually resolved, multi-century spring precipitation reconstruction for this region in southern Africa, where vulnerability to future climate change is high.

Clanwilliam cedar ( Widdringtonia cedarbergensis ; WICE )是南非开普省具有独特年轮的长寿针叶树，有可能为南部非洲提供独特的高分辨率气候代理。然而，WICE 年轮宽度 (TRW) 的气候信号较弱，因此需要探索其他 WICE 年轮参数的树状气候潜力。在这里，我们研究了各种树轮参数中的气候信号，包括 TRW、最小密度 (MND)、最大晚材密度 (MXD)、最大晚材蓝色强度 (MXBI) 以及稳定的碳和氧同位素（δ ¹⁸ O 和δ ¹³C) 在 1978 年收集的 WICE 样本中测量。MND 受到早春（10 月至 11 月）降水的负面影响，而 TRW 受到春季 11 月至 12 月降水的正面影响。MXD 受秋季（4-5 月）温度的负面影响，而 MXBI 不受温度的影响。MXD 和 MXBI 分别受到 1-3 月和 1-5 月降水的负面影响。我们在任何一个稳定同位素时间序列中都没有发现显着的气候信号，这是在有限数量的样本上测量的。WICE 可以活到至少 356 岁，当前的 TRW 年表可以追溯到公元 1564 年。替代树轮参数的全长年表的发展，特别是 MND，将允许每年解决，