Yang Jingwen, Zhang Qiuliang, Song Wenqi, Zhang Xu, Wang Xiaochun
School of Life, Qufu Normal University, Qufu, China.
College of Forestry, Inner Mongolia Agricultural University, Hohhot, China.
Front Plant Sci. 2022 Jun 2;13:912916. doi: 10.3389/fpls.2022.912916. eCollection 2022.
Of all forest biomes, boreal forests are experiencing the most significant warming. Drought caused by warming has a dramatic impact on species in boreal forests. However, little is known about whether the growth of trees and shrubs in boreal forests responds consistently to warming and drought. We obtained the tree-ring width data of 308 trees ( and var. ) and 133 shrubs () from 26 sites in northeastern China. According to the climate data from 1950 to 2014, we determined three extreme drought years (1954, 1967, and 2008). The response difference of radial growth of trees and shrubs in boreal forests to drought was compared using resilience index, moving correlation and response analysis. The results showed that high temperature (mean and maximum temperature) in previous and current growing seasons promoted the growth of , but inhibited the growth of trees. On the contrary, wetter conditions (higher PDSI) promoted tree growth but were not conducive to growth in high latitudes. Moving correlation analysis showed similar results. In addition, water deficit was more likely to inhibit growth in low latitudes. The drought resistance of was stronger than that of and var. . Therefore, the growth loss and recovery time of during drought was less than those of trees. We concluded that and var. are more prone to growth decline than after the drought caused by climate warming. In the future climate warming, shrub growth may benefit more than trees. Our findings are of great significance in predicting the future changes in ecosystem composition and species distribution dynamics in extreme climate susceptible areas.
在所有森林生物群落中，北方森林正在经历最为显著的变暖。变暖导致的干旱对北方森林中的物种产生了巨大影响。然而，对于北方森林中树木和灌木的生长是否对变暖和干旱做出一致反应，我们却知之甚少。我们获取了来自中国东北26个地点的308棵树（ 及 变种）和133株灌木（ ）的年轮宽度数据。根据1950年至2014年的气候数据，我们确定了三个极端干旱年份（1954年、1967年和2008年）。利用恢复力指数、移动相关性和响应分析比较了北方森林中树木和灌木径向生长对干旱的响应差异。结果表明，前一个和当前生长季节的高温（平均温度和最高温度）促进了 的生长，但抑制了树木的生长。相反，更湿润的条件（更高的PDSI）促进了树木生长，但不利于高纬度地区 的生长。移动相关性分析显示了类似结果。此外，水分亏缺在低纬度地区更有可能抑制 的生长。 的抗旱性强于 和 变种。因此，干旱期间 的生长损失和恢复时间少于树木。我们得出结论，在气候变暖导致的干旱之后， 和 变种比 更容易出现生长下降。在未来气候变暖的情况下，灌木生长可能比树木受益更多。我们的研究结果对于预测极端气候敏感地区生态系统组成和物种分布动态的未来变化具有重要意义。
