The Ecosystems Center, Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543, USA; Lanzhou University, Lanzhou, China.
The Ecosystems Center, Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543, USA; Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling, UK.
Sci Total Environ. 2022 Jan 20;805:149926. doi: 10.1016/j.scitotenv.2021.149926. Epub 2021 Aug 31.
The effect of climate change on phenology and growth is less understood for belowground plant tissues than for aboveground plant tissues, particularly in high-latitude regions. Ecotypes within a species adapted to a locality may display different responses to climate change. We established two common garden plots in the Arctic tundra north of the Brooks Range in northern Alaska. Three ecotypes of Eriophorum vaginatum along a latitudinal gradient were transplanted into common gardens, and half of the transplants were warmed using open-top chambers (OTCs). Minirhizotrons were used to track the root phenology during the growing seasons of 2016 and 2017. Warming with OTCs (approximately +1 °C in air) did not affect the root biomass, root production or root phenology. The southern ecotype (from 67°16'N) of Eriophorum vaginatum transplanted northward experienced delayed startup and root production compared to two northern ecotypes (from 68°38'N and 69°25'N), although significant differences were not observed in the three ecotypes in terms of root production, root biomass and growth duration at the two sites. Our results suggest that as the climate warms, ecotypes of Eriophorum vaginatum may be able to adjust their duration of root growth and root productivity by phenotypic plasticity, although the degree of plasticity controlling the root startup time may vary between southern and northern ecotypes.
气候变化对地下植物组织的物候和生长的影响比对地上植物组织的影响了解得更少，特别是在高纬度地区。适应特定地点的物种内的生态型可能对气候变化有不同的反应。我们在阿拉斯加北部布鲁克斯山脉以北的北极苔原建立了两个普通花园。三种沿纬度梯度的柳兰生态型被移植到普通花园中，其中一半的移植物使用开顶式气室（OTC）进行加热。在 2016 年和 2017 年的生长季节期间，使用迷你根管跟踪根物候。OTC 的加热（空气温度约升高+1°C）不会影响根生物量、根产量或根物候。与两个北部生态型（来自 67°16'N 和 69°25'N）相比，向北移植的柳兰南部生态型（来自 67°16'N）的启动和根产量延迟，尽管在两个地点，三个生态型的根产量、根生物量和生长持续时间方面没有观察到显著差异。我们的结果表明，随着气候变暖，柳兰的生态型可能能够通过表型可塑性来调整其根生长和根生产力的持续时间，尽管控制根启动时间的可塑性程度在南部和北部生态型之间可能有所不同。
