亚洲树轮缺轮率的空间分布特征及其影响因素

Spatial Distribution of Missing Ring Rate in Asia and Their Influencing Factors

受极端气候影响,树木的形成层会停止生长从而产生缺轮,分析缺轮记录可重建大范围极端气候事件。使用国际树轮库(ITRDB)中的294个点的缺轮记录,分析亚洲缺轮率的空间分布特征及其影响因素,得出以下结果:亚洲缺轮记录主要集中在寒冷区与干旱区,而干旱区气候条件下树木的缺轮率更高。不同树种缺轮率对气候要素响应存在差异,其中大果圆柏(Juniperus tabetic)、云南铁杉(Tsuga Dumosa)缺轮率与降水量显著负相关,欧洲赤松(Pinus sylvestris)与降水量显著正相关。不同树龄间缺轮率差异明显,老龄树有较高的缺轮率。上述结果说明了亚洲树木缺轮率的空间差异,在全球气候暖干化的背景下,亚洲树木缺轮现象更加频发。

The cambium of trees stops growing due to the influence of extreme climate.Analyzing the missing ring records can reconstruct a wide range of extreme climate events.This study uses 294 missing ring records from the International Tree Ring Date Bank(ITRDB)to analyze the spatial distribution characteristics and influencing factors of the missing ring rate in Asia.The results are as followed,the missing ring records in Asia are concentrated in cold and arid areas,and low temperature and arid climate conditions make trees have a high rate of missing ring,and drought makes trees have a higher rate of missing ring rate.The missing ring rate of different tree species have different responses to climate factors.Among them,the missing ring rate of Juniperus tibetica and Tsuga Dumosa are significantly negatively correlated with precipitation,and Pinus sylvestris has a significant positive correlation.There are significant differences in missing ring rate among different tree ages,and missing ring rate among old trees was higher.The above results illustrate the spatial differences in missing ring rate in Asian trees.Under the background of global warming and drying,the phenomenon of missing ring in Asian trees is more frequent.