新西兰贝壳杉树是南半球重要的树木年代学资源,因为它们的寿命长,而且年轮宽度与厄尔尼诺 - 南方涛动 (ENSO) 事件相关。这项研究代表了新西兰贝壳杉的第一次受年代学约束的树木化学调查。锶同位素 (
87
Sr/
86
Sr) 和微量元素分析相结合,以确定利用贝壳杉木材的地球化学进行起源(空间)和环境(时间)树木化学调查的潜力。土壤 Sr 同位素测量结果与当地树木 80% 的相应分析相匹配,并且四个研究地点中的两个具有紧密聚集和独特的贝壳杉同位素组成,支持来源调查。记录树木间同位素变化的两个地点,包括地质、大气(沙尘和海浪)和人为(土地利用)在内的变量组合,都可能影响同位素和微量元素的变化。从同位素年轮记录中很难观察到离散的年度事件或波动条件,这反映了 Sr 在年轮中的潜在流动性。然而,
New Zealand kauri trees are an important dendrochonologic resource in the southern hemisphere due to their long lifespans and the correlation of ring widths to El Niño - Southern Oscillation (ENSO)-events. This study represents the first chronology-constrained dendrochemical investigation of New Zealand kauri. Strontium isotope (
87
Sr/
86
Sr) and trace element analyses are combined to determine the potential for provenance (spatial) and environmental (temporal) dendrochemical investigations utilizing the geochemistry of kauri wood. Soil Sr isotopic measurements match 80% of the corresponding analyses from local trees and two of the four study sites have kauri isotopic compositions tightly clustered and distinctive, supportive of provenance investigations. The two sites which record inter-tree isotopic variability, a combination of variables, including geologic, atmospheric (dust and sea spray), and anthropogenic (land-use), all likely influence the isotopic and trace element variations. Discrete annual events or fluctuating conditions are difficult to observe from the isotopic tree ring record, reflecting the potential mobility of Sr within tree rings. However, the preservation of long term geochemical trends suggest processes such as climate change or anthropogenic soil modification may still be preserved in the kauri record.