Accelerated rate of vegetation green-up related to warming at northern high latitudes.,Global Change Biology

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Accelerated rate of vegetation green-up related to warming at northern high latitudes.
Global Change Biology ( IF 10.8 ) Pub Date : 2020-09-01 , DOI: 10.1111/gcb.15322
Hoonyoung Park _{1,

2} , Sujong Jeong _{1,

2} , Josep Peñuelas _{3,

4}

Affiliation

Mid‐ to high‐latitude vegetation are experiencing changes in their seasonal cycles as a result of climate change. Although the rates of seasonal growth from winter dormancy to summer maturity have accelerated because of changes in environmental conditions, less attention has been paid to the rate of vegetation green‐up (RVG) and its dynamics, which could advance vegetation maturity. We analyzed the long‐term changes in RVG and the drivers at high northern latitudes for 35 years (1982–2016) using satellite‐retrieved leaf area index data based on partial correlation analyses and multivariable linear regression. The rates tended to increase significantly with time, particularly at high latitudes above 60°N in North America (1.8% mon⁻¹ decade⁻¹, p < .01) and Eurasia (1.0% mon⁻¹ decade⁻¹, p < .01). The increasing trend in North America was mostly because of increased heat accumulation in spring (1.2% mon⁻¹ decade⁻¹), that is, more rapid green‐up owing to warming, with an increased carbon dioxide concentration (0.6 mon⁻¹ decade⁻¹). The trend in Eurasia, however, was induced by warming, increased carbon dioxide concentration, and stronger radiation, 1.0%, 0.7%, and 0.5% mon⁻¹ decade⁻¹, respectively, but was partly counteracted by earlier pregreen‐up dates of −1.2% mon⁻¹ decade⁻¹, that is, earlier initiation of growth which counteracted green‐up rate acceleration. The results suggested that warming was the predominant factor influencing the accelerated RVG at high latitudes; however, Eurasian vegetation exhibited different green‐up dynamics, mitigating the influence of warming with the earlier pregreen‐up. Our findings imply that high‐latitude warming will drive vegetation seasonality toward rapid green‐up and early maturity, leading to the reinforcement of climate–vegetation interactions; however, the consequences will be more distinct in North America owing to the absence of alleviation by earlier pregreen‐up.

中文翻译：

与北部高纬度地区变暖有关的植被绿化加速速率。

由于气候变化，中高纬度植被的季节周期正在发生变化。尽管由于环境条件的变化，从冬季休眠到夏季成熟的季节增长率加快了，但对植被绿化速率及其动态的关注却很少，这可能会促进植被成熟。我们基于偏相关分析和多变量线性回归，使用卫星获取的叶面积指数数据分析了北纬高纬度地区RVG和驱动器在35年（1982-2016年）中的长期变化。随着时间的推移，该速率有显着增加的趋势，特别是在北美高于60°N的高纬度地区（星期一^-1十年^-1，p为1.8％ <.01）和欧亚大陆（1.0％，星期一^-1十年^-1，p <.01）。在北美增加的趋势主要是因为在春季增加热量堆积（1.2％周一的^-1十年^-1），也就是更迅速返青，由于气候变暖，与增加的二氧化碳浓度（0.6周一^-1十年^-1）。在欧亚的趋势，但是，诱导加热，增加的二氧化碳浓度，和更强的辐射，1.0％，0.7％，和0.5％的周一^-1十年^-1分别，但通过早期pregreen行动日期被部分抵消−1.2％星期一^-1个十年^-1，也就是说，较早开始的增长抵消了绿色增长的速度。结果表明，在高纬度地区，变暖是影响RVG加速的主要因素。但是，欧亚植被表现出不同的绿化动态，从而减轻了较早的绿化对变暖的影响。我们的发现表明，高纬度变暖将推动植被的季节性向快速绿化和早熟的方向发展，从而增强气候与植被的相互作用。但是，由于早先的绿化措施没有缓解，北美地区的后果将更加明显。

更新日期：2020-10-19

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