Different tree-ring responses of Norway spruce to air temperature across an altitudinal gradient in the Eastern Carpathians (Romania)
Different tree-ring responses of Norway spruce to air temperature across an altitudinal gradient in the Eastern Carpathians (Romania)
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DOI：
10.1007/s00468-015-1178-3
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发表时间：
2015-03
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影响因子：
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通讯作者：
C. Sidor;I. Popa;R. Vlad;P. Cherubini
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文献类型：
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作者：
C. Sidor;I. Popa;R. Vlad;P. Cherubini
关键信息全球气温升高可能会增加高海拔地区树木的生长，而在低海拔地区则会减少。另一个直接的后果将是增加的高度阈值的反转树的生长响应temperature.AbstractThe第一个网络的18个树木年轮年表挪威云杉（云杉）从东喀尔巴阡山脉（罗马尼亚）的树木生长响应气候的气候因素和区域格局进行了研究。这些地点分布沿着一个纬度和海拔样带。利用响应函数分析了树木生长对气候变异性的反应。我们使用冗余分析（RDA），以确定气候响应的区域模式。罗马尼亚东喀尔巴阡山脉的挪威云杉直径生长模式对应于三个海拔水平的不同气候响应：低海拔（≤1000 m a.s.l.）;中等（1000-1300 m a.s.l.）;高（≥1300 m a.s.l.）。在高海拔地区，树木的生长受到夏季气温的强烈限制。这种气候信号随着海拔的降低和平均温度的升高而逐渐减弱。在低海拔地区，树木生长主要受夏季降水量的控制，而在中等海拔地区，与气候变量之间没有任何统计上的显著相关性。在海拔1000-1100米的地方，在6月平均气温为13-13.5 °C和7月平均气温为15.5-16 °C时，平均气温的进一步升高导致树轮生长与温度之间的关系反转（即，答案是否定的）。全球气温的上升可能会增加高海拔地区树木的生长，而在低海拔地区则会减少。另一个直接的后果将是增加的高度阈值，树木生长对温度的反应发生逆转。
Key messageA global increase in temperature could potentially increase the trees’ growth at high altitude and decrease at low altitude. Another immediate consequence would be an increase of the altitude threshold where the inversion of tree growth response to temperature occurs.AbstractThe first network of 18 tree-ring chronologies of Norway spruce (Picea abies) from the Eastern Carpathians (Romania) was studied in relation to the climatic factors and regional patterns in tree growth responses to climate. The sites are distributed along a latitudinal and altitudinal transect. The tree growth reaction to climate variability was analyzed by means of response functions. We used redundancy analysis (RDA) to identify regional patterns in the climatic response. The Norway spruce diameter growth patterns in Eastern Carpathians from Romania correspond to different climatic responses according to three elevation levels: low (≤1000 m a.s.l.); intermediate (1000–1300 m a.s.l.); high (≥1300 m a.s.l.). At high altitudinal level tree growth is strongly limited by summer temperatures. This climatic signal progressively decreases with decreasing altitude and increasing mean temperature. Tree growth at low elevation sites is controlled mainly by summer precipitations and in the intermediate elevation sites there is not any statistically significant correlation with climatic variables. At elevations of 1000–1100 m a.s.l., at a mean temperature of 13–13.5 °C in June and 15.5–16 °C in July, further increases in mean temperature result in an inversion of the relationship between tree-ring growth and temperature (i.e., the response becomes negative). A global increase in temperature could potentially increase the trees’ growth at high altitude and decrease at low altitude. Another immediate consequence would be an increase of the altitude threshold where the inversion of tree growth response to temperature occurs.