Five decades of growth in a genetic field trial of Douglas-fir reveal trade-offs between productivity and drought tolerance
Five decades of growth in a genetic field trial of Douglas-fir reveal trade-offs between productivity and drought tolerance
复制标题
花旗松基因田间试验的五年生长揭示了生产力和耐旱性之间的权衡
作者：
David Montwé;H. Spiecker;A. Hamann
为了在不确定的未来气候条件下选择合适的造林树种，需要了解基因型对不同气候条件的耐受性。一个有用的方法是结合联合收割机树木年代学研究与常见的花园实验，以量化随着时间的推移观察到的基因型与环境的相互作用。在这里，我们评估的反应，花旗松种源种植在一个共同的环境，气候变化超过五十年，使用树木年轮分析和历史高度数据。一个罕见的干旱事件，影响了1985年的增长提供了机会，以研究如何成熟的道格拉斯冷杉种源不同的弹性和抗干旱条件下，是否有权衡与长期生产力。我们发现，起源于沿海范围内的干燥和寒冷的环境中的种源的整体生长性能低于平均水平，并与温度的年际变化。生产性种源主要来自温暖湿润地区，其年生长量与夏季降水量和夏季干旱指数呈显著的协变关系。此外，低于平均增长的种源能够更快地从1985年的干旱事件中恢复过来，但并没有表现出比沿海来源更强的抗旱性。我们的研究结果为生产力和抗旱能力之间的权衡提供了证据，并表明来自潮湿地区的来源更依赖于夏季有利的生长条件。我们的结论是，选择耐旱的种植股票作为气候变化的适应战略是可能的，但它会导致生产力下降。
To select suitable planting stock for reforestation under uncertain future climates, information about tolerances of genotypes to different climate conditions is necessary. One useful approach is to combine dendrochronological research with common garden experiments to quantify genotype by environment interactions observed over time. Here, we assess the response of Douglas-fir provenances planted in a common environment to climate variation over five decades using tree-ring analysis and historic height data. A rare drought event that affected growth in the year of 1985 provided the opportunity to study how mature Douglas-fir provenances differ in resilience and resistance to drought conditions and whether there are trade-offs with long-term productivity. We found that overall growth performance of provenances originating from drier and colder environments within the coastal range was below average and correlated with interannual variation in temperature. Productive provenances originated primarily from moist and warm areas and their annual increments covaried strongly with summer precipitation and summer drought indices. Further, provenances with below average growth were able to recover more quickly from the drought event of 1985, but did not show stronger drought resistance than coastal sources. Our results provide evidence for trade-offs between productivity and drought resilience and show that sources originating from moist locations are more dependent on favorable growing conditions in the summer. We conclude that selecting drought-resilient planting stock as an adaptation strategy for climate change is possible, but it would entail reductions in productivity.
影响因子：
2.3
作者：
Jansen, Kirstin;Sohrt, Jakob;Gessler, Arthur
通讯作者：
Gessler, Arthur