College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China.
College of Urban and Environmental Sciences, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China.
Sci Total Environ. 2023 Apr 10;868:161649. doi: 10.1016/j.scitotenv.2023.161649. Epub 2023 Jan 16.
Climate change is posing dramatic effects on terrestrial vegetation dynamics. The links between vegetation phenology or vegetation activity (growth) and climate change have been widely reported, yet, less is known about the impacts of phenological shifts on vegetation growth. Urban settings characterized by urban heat island and CO dome are often used as ideal natural laboratories to understand how vegetation responds to global climate change. Here we assessed the impacts of phenology changes on vegetation growth in China using satellite phenology metrics and gross primary production (GPP) data from 2003 to 2018 and urban-natural contrast analysis. Compared with natural environments, phenological metrics (e.g., start/end of growing season (SOS/EOS), and the length of growing season (GSL), etc.) were observed to change more dramatically in urban environments. Furthermore, we found that GPP in both settings increased over time but with a higher increment in the urban environments, and the urban-natural vegetation productivity gap had been diminishing at a rate of 16.9 ± 6.76 g C m y. The narrowing of the urban-natural GPP difference over time can be attributed to a more advanced SOS and extended GSL in urban settings than their natural counterparts, particularly SOS shift. These findings suggested that the distinct urban phenological shifts would become increasingly important in offsetting the loss of vegetation productivity induced by urbanization.
气候变化对陆地植被动态造成了显著影响。植被物候或植被活动（生长）与气候变化之间的联系已被广泛报道，但关于物候转变对植被生长的影响知之甚少。城市环境以城市热岛和 CO2 穹顶为特征，通常被用作理想的自然实验室，以了解植被如何应对全球气候变化。在这里，我们使用卫星物候指标和 2003 年至 2018 年的总初级生产力（GPP）数据以及城市-自然对比分析，评估了物候变化对中国植被生长的影响。与自然环境相比，城市环境中的物候指标（例如，生长季节开始/结束时间（SOS/EOS）和生长季节长度（GSL）等）变化更为剧烈。此外，我们发现，两种环境中的 GPP 都随时间增加，但城市环境中的增量更高，城市-自然植被生产力差距以 16.9 ± 6.76 g C m y 的速度缩小。随着时间的推移，城市-自然 GPP 差异的缩小可归因于城市环境中 SOS 提前和 GSL 延长，与自然环境相比，尤其是 SOS 变化。这些发现表明，独特的城市物候变化将在抵消城市化导致的植被生产力损失方面变得越来越重要。
