High-latitude vegetation experience different temperatures than the ambient air temperature. While lacking a regional plant temperature product, we drove the dynamic ecosystem model, LPJ-GUESS, with widely used ERA5-land surface temperature (T_surf, at radiative equilibrium) and air temperature to understand ecosystem process responses to these two temperatures. We show that tundra plants' growth is stimulated by warmer T_surf in the summer, but in the boreal forests, colder T_surf in the non-summer months constrains leaf development and enzyme activity the following growing season. T_surf drives higher productivity of tundra plant individuals but leads to less productive individuals in the boreal forest, although with compensatory changes (almost 68%) in vegetation structure. We demonstrate the importance of forcing temperature in simulating high-latitude ecosystem processes and call for a community effort to measure plant temperatures across canopy heights and seasons to reduce uncertainties in estimating high-latitude plant responses and feedback to climate.

中文翻译：

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空气温度和表面温度以不同的方式驱动高纬度地区的陆地碳和水循环


高纬度植被经历的温度与环境空气温度不同。虽然缺乏区域植物温度产品，但我们驱动了动态生态系统模型 LPJ-GUESS，其中广泛使用了 ERA5 地表温度（T_surf，处于辐射平衡状态）和空气温度，以了解生态系统过程对这两个温度的响应。我们表明，夏季较暖的 T_层冲浪会刺激苔原植物的生长，但在北方森林中，非夏季较冷的 T_层会限制下一个生长季节的叶片发育和酶活性。T_surf 推动了苔原植物个体的生产力提高，但导致北方森林中个体的生产力降低，尽管植被结构发生了补偿性变化（近 68%）。我们展示了强迫温度在模拟高纬度生态系统过程中的重要性，并呼吁社区努力测量不同冠层高度和季节的植物温度，以减少估计高纬度植物响应和对气候的反馈的不确定性。