Synchronizations of tree-ring δ18O time series within and between tree species and provinces in Korea: a case study using dominant tree species in high elevations
Synchronizations of tree-ring δ18O time series within and between tree species and provinces in Korea: a case study using dominant tree species in high elevations
复制标题
DOI：
10.1186/s10086-020-01901-3
复制
发表时间：
2020-07-31
影响因子：
2.9
通讯作者：
Seo, Jeong-Wook
中科院分区：
文献类型：
--
作者：
Choi, En-Bi;Sano, Masaki;Seo, Jeong-Wook
目前的研究开始测试树轮三角洲O-18（以下简称三角洲O-18（TR））的时间序列内和树种和省份之间的同步，这是约144公里，彼此在韩国。为了进行检验，使用松尼山国家公园的赤松和蒙古栎以及智异山国家公园的东北红豆杉、红松、朝鲜冷杉和蒙古栎的每种树种的四棵树，开发了50年的δ（18）O（TR）时间序列（1966-2015）。使用t值、Gleichlaufigkeit（Glk）和表达的群体信号（EPS）评估它们的同步性。树种内的平均值和Glk得分分别为5.2-11.2（p < 0.05）和69- 83%，树种间的平均值和Glk得分分别为6.1-13.2（p < 0.05）和73- 81%。区域间的平均值和Glk评分分别为4.3（p < 0.05）和72%。此外，除Q外，EPS均高于年轮学公认的阈值0.85。蒙古松尼山国家公园，仅用两个δ（18）O（TR）时间序列计算的值为0.83。根据统计结果，我们认为，用4棵以上树木建立的δ（18）O（TR）年代学可以作为不考虑树种的定年方法和过去气候研究的参考。
The current study was initiated to test the synchronizations of tree-ring delta O-18 (hereafter delta O-18(TR)) time series within and between tree species and provinces, which are about 144 km apart from each other in Korea. For the test, a 50-year delta(18)O(TR)time series (1966-2015) was developed using four trees from each tree species which arePinus densifloraandQuercus mongolicafrom Songnisan National Park andTaxus cuspidata,Pinus koraiensis,Abies koreana, andQuercus mongolicafrom Jirisan National Park. Their synchronizations were evaluated usingt-value, Gleichlaufigkeit (Glk), and Expressed Population Signal (EPS). The meant-values and Glk scores within the tree species ranged 5.2-11.2 (p < 0.05) and 69-83%, and between the tree species ranged 6.1-13.2 (p < 0.05) and 73-81%, respectively. The meant-value and Glk score between the regions were 4.3 (p < 0.05) and 72%, respectively. Furthermore, the EPS showed higher than 0.85, which is the generally accepted threshold value in dendrochronology, except forQ. mongolicaat Songnisan National Park for which the value is 0.83 calculated by only two delta(18)O(TR)time series. Based on the statistical results, we concluded that a delta(18)O(TR)chronology established using more than four trees could serve as a promising reference for dating an undated wood without considering the tree species, as well as for research on climate in the past.