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 km2; 25.9 ± 4.6%), precipitation (77.5 ± 3.3 Mio km2; 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 km2. 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.
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机译：在大的时空尺度上，对树木生长的能量和水的限制仍然知之甚少，这阻碍了年际或长期生态系统过程的模型表示。通过评估和统计2710个树木年轮站点的气候驱动因素，我们确定了1930–1960年公元前树木生长对温度（20.8±3.7 Mio km 2 ）产生正响应的寒带和温带土地区域。 25.9±4.6％），降水（77.5±3.3 Mio km 2 ; 96.4±4.1％）和其他参数。这种气候响应的空间表现是由纬度和纬度温度梯度决定的，表明变暖导致生长限制的地理变化。我们观察到，在1930-1960年和1960-1990年之间，冷干场所的温度响应显着下降（P <0.001），总温度限制区域缩小了-8.7±0.6 Mio km 2 。同时，几乎全世界范围内，树木受到大气水需求的限制越来越大。这些变化是在温和的变暖条件下发生的，我们预计持续的气候变化将触发增长对气候变化的重大重新分配。
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