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首页> 外文期刊>Dendrochronologia >Changes in the radial growth of Picea crassifolia and its driving factors in the mid-western Qilian Mountains, Northwest China since 1851 C.E
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Changes in the radial growth of Picea crassifolia and its driving factors in the mid-western Qilian Mountains, Northwest China since 1851 C.E

机译：自1851年以来，西北部西北部祁连山中西部祁连山径向增长及其驱动因素的变化

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摘要

Examining the growth of trees in response to environmental factors is essential for evaluating the stability of forest ecosystems. In this study, using tree ring data obtained from 18 sites and climate diagnostic methods. we investigated relationships between the radial growth of Picea crassifolia in the mid-western Qilian Mountains and local climate/sea surface temperatures (SSTs) since 1851 C.E. The results revealed that the radial growth of P. crassifolia showed significant upward trends during three time periods (1884-1906, 1929-1946, and 1964-1983) and significant downward trends in a further three periods (1907-1928, 1947-1963, and 1984-1995). Variations in the growth of P. crassifolia showed a significant negative correlation with temperature in June and a positive correlation with precipitation from July in the previous year to June in the current year as a response to climate change. We also found that large-scale anomalies could influence the radial growth of P. crassifolia, which was reflected in results showing that extremely high radial growth is related to El Nino patterns in the central-eastern equatorial Pacific, whereas extremely low growth is related to anomalously warmer SSTs in the southern Indian Ocean. Notably, we found that the extremely low growth of P. crassifolia in response to SST was more stable than that of extremely high growth. Furthermore, on the basis of qualitative methodology, we established that years characterized by extremely high/low growth were largely/little influenced by the time window and threshold values that were selected when determining the positive/negative pointer years. Our results confirm the validity of using the relationships between extremely low growth and SSTs to predict forest dynamics.
机译：检查树木的生长以应对环境因素，对于评估森林生态系统的稳定性至关重要。在这项研究中，使用从18个站点获得的树环数据和气候诊断方法。我们调查了自由西部祁连山中西部Crassifolia的径向生长与局部气候/海面温度（SSTS）之间的关系，从1851年CE开始，结果表明，P. Craseifolia的径向生长在三次期间显示出显着的上升趋势（ 1884-1906,1929-1946和1964-1983）以及进一步的三个时期（1907-1928,1947-1963和1984-1995）的显着下行趋势。 P. Crassifolia的生长的变化与6月份的温度显着相关，以及与日本六月的7月份的阳性相关性作为对气候变化的反应。我们还发现大规模的异常可能影响P. Crassifolia的径向生长，这反映在结果中，表明极高的径向增长与中东赤道太平洋地区的EL NINO模式有关，而且增长极低了在印度洋南部的异常温暖的SST。值得注意的是，我们发现P. Crassifolia响应SST的极低生长比极高的生长更稳定。此外，在定性方法的基础上，我们确定多年来，其特征在于，在确定正/负指针时选择的时间窗口和阈值很大程度上/很小。我们的结果证实了使用极低增长和SST之间的关系来预测森林动态的有效性。

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