Growth Assessment of Native Tree Species from the Southwestern Brazilian Amazonia by Post-AD 1950 14C Analysis: Implications for Tropical Dendroclimatology Studies and Atmospheric 14C Reconstructions
Growth Assessment of Native Tree Species from the Southwestern Brazilian Amazonia by Post-AD 1950 14C Analysis: Implications for Tropical Dendroclimatology Studies and Atmospheric 14C Reconstructions
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DOI：
10.3390/f12091177
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发表时间：
2021-08
期刊：
影响因子：
2.9
通讯作者：
G. Santos;Daigard Ricardo Ortega Rodriguez;N. D. Barreto;Gabriel Assis-Pereira;A. Barbosa;F. Roig;Mário Tomazello-Filho
中科院分区：
文献类型：
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作者：
G. Santos;Daigard Ricardo Ortega Rodriguez;N. D. Barreto;Gabriel Assis-Pereira;A. Barbosa;F. Roig;Mário Tomazello-Filho
雪松树轮宽度年代学（Cedrela fissilis Vell.）（1875 ~ 2018）， jatob<e:1> （Hymenaea courbaril L.）（1840 - 2018）和roxinho Peltogyne paniculata Benth。)（1910年至2018年）是通过亚马逊盆地南部的树木年代学技术开发的。获得了树木年轮年表的可接受的统计数字，并确定了年历日期。由于缺乏用于退化森林地区古气候重建的长期年代学，因此通过14C分析验证了树木年代学测年。选取的年轮分别对应1957年、1958年、1962年、1963年、1965年、1971年和1972年。这些是大气14C变化最高的关键历年，因此，当与现有的公元1950年后大气14C大气曲线相一致时，它们的树轮纤维素提取物14C特征将表明年度周期性。通过我们的相关历年和公元1950年之后的14C签名，我们表明H. courbaril显示出一个不稳定的木材年龄序列。另外两种树种，C. fissilis和P. paniculata是一年生树种，可以成功地用作古气候指标。此外，由于采样点与南美洲热带低压带有关，这些树木可用于增强南半球大气14C校准曲线中有限的观测数据。
Tree-ring width chronologies of cedro (Cedrela fissilis Vell.) (1875 to 2018), jatobá (Hymenaea courbaril L.) (1840 to 2018) and roxinho Peltogyne paniculata Benth.) (1910 to 2018) were developed by dendrochronological techniques in the southern Amazon Basin. Acceptable statistics for the tree-ring chronologies were obtained, and annual calendar dates were assigned. Due to the lack of long-term chronologies for use in paleoclimate reconstructions in degraded forest areas, dendrochronological dating was validated by 14C analysis. Tree-rings selected for analysis corresponded to 1957, 1958, 1962, 1963, 1965, 1971, and 1972. Those are critical calendar years in which atmospheric 14C changes were the highest, and therefore their tree-ring cellulose extracts 14C signatures when in alignment with existing post-AD 1950 atmospheric 14C atmospheric curves would indicate annual periodicity. Throughout our correlated calendar years and post-AD 1950 14C signatures, we indicate that H. courbaril shows an erratic sequence of wood ages. The other two tree species, C. fissilis and P. paniculata, are annual in nature and can be used successfully as paleoclimate proxies. Moreover, due to the sampling site’s strategic location in relation to the Tropical Low-Pressure Belt over South America, these trees can be used to enhance the limited amount of observational data in Southern Hemisphere atmospheric 14C calibration curves.