Twentieth century redistribution in climatic drivers of global tree growth
Twentieth century redistribution in climatic drivers of global tree growth
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DOI：
10.1126/sciadv.aat4313
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发表时间：
2019-01-01
期刊：
影响因子：
13.6
通讯作者：
Frank, David C.
中科院分区：
文献类型：
--
作者：
Babst, Flurin;Bouriaud, Olivier;Frank, David C.
在大的时空尺度上，树木生长的能量和水分限制仍然没有得到充分的认识，这阻碍了年际或长期生态系统过程的模型表示。通过对2710个树木年轮站点的气候驱动因子进行评估和统计标度，我们确定了寒带和温带地区树木生长在1930-1960年间对温度的响应为正(20.8 +/- 3.7 Mio km(2)；25.9 + / - 4.6%)、降水(77.5 + / - 3.3公里(2)年产量;96.4 +/- 4.1%)等参数。这种气候响应的空间表现是由纬向和纬向温度梯度决定的，表明变暖导致了生长限制的地理变化。1930-1960年和1960-1990年间，冷干样地的温度响应显著降低（P < 0.001），总温度限制面积减少了-8.7 +/- 0.6 Mio km(2)。与此同时，树木几乎在全球范围内都受到大气用水需求的限制。这些变化发生在温和变暖的情况下，我们预计持续的气候变化将引发对气候的增长响应的重大再分配。
Energy and water limitations of tree growth remain insufficiently understood at large spatiotemporal scales, hindering model representation of interannual or longer-term ecosystem processes. By assessing and statistically scaling the climatic drivers from 2710 tree-ring sites, we identified the boreal and temperate land areas where tree growth during 1930-1960 CE responded positively to temperature (20.8 +/- 3.7 Mio km(2); 25.9 +/- 4.6%), precipitation (77.5 +/- 3.3 Mio km(2); 96.4 +/- 4.1%), and other parameters. The spatial manifestation of this climate response is determined by latitudinal and altitudinal temperature gradients, indicating that warming leads to geographic shifts in growth limitations. We observed a significant (P < 0.001) decrease in temperature response at cold-dry sites between 1930-1960 and 1960-1990 CE, and the total temperature-limited area shrunk by -8.7 +/- 0.6 Mio km(2). Simultaneously, trees became more limited by atmospheric water demand almost worldwide. These changes occurred under mild warming, and we expect that continued climate change will trigger a major redistribution in growth responses to climate.