College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and the Ministry of Water Resources, Yangling 712100, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China; Institute of Soil and Water Conservation, Chinese Academy of Sciences and the Ministry of Water Resources, Yangling 712100, China.
Sci Total Environ. 2024 Jul 10;933:173146. doi: 10.1016/j.scitotenv.2024.173146. Epub 2024 May 10.
Extreme, dry events have major impacts on vegetation phenology worldwide. However, the differential responses of vegetation phenology to climatic elements during these extreme events remain unclear. We investigated the response of vegetation phenology to climatic factors during extreme events in arid and semi-arid regions of the Chinese Loess Plateau, using the climate water deficit method, to identify extremely dry and wet events. The results revealed that extremely wet events extended the vegetation growth periods in addition to global warming, whereas extremely dry events did not completely counteract this effect. During different extreme events, phenological changes in vegetation on the Loess Plateau were primarily influenced by the interactive effects of climatic factors. During extremely dry events, a 100 mm increase in precipitation advanced the start of the season by 3.0, 9.2, and 16.7 days in forest, shrubland, and grassland, respectively. During extremely wet events, a 1 °C rise in temperature delayed the end of the season by 1.6, 0.6, and 3.8 days in forest, shrubland, and grassland, respectively. These findings provide crucial guidance for improving predictions of plant phenology changes under extreme climatic events and unraveling biosphere-atmosphere feedback cycles.
极端干旱事件对全球植被物候产生重大影响。然而，植被物候对这些极端事件下气候要素的差异响应仍不清楚。本研究利用气候水分亏缺方法，以确定干旱和半干旱地区的极端干旱和湿润事件，调查了中国黄土高原植被物候对气候因子的响应。结果表明，除全球变暖外，极端湿润事件还延长了植被生长期，而极端干旱事件并不能完全抵消这种效应。在不同的极端事件中，黄土高原植被物候的变化主要受到气候因子相互作用的影响。在极端干旱事件中，降水增加 100 毫米分别使森林、灌丛和草地的物候提前 3.0、9.2 和 16.7 天。在极端湿润事件中，温度升高 1°C 分别使森林、灌丛和草地的物候推迟 1.6、0.6 和 3.8 天。这些发现为改进极端气候事件下植物物候变化预测以及揭示生物圈-大气反馈循环提供了重要指导。
