Critical role of water conditions in the responses of autumn phenology of marsh wetlands to climate change on the Tibetan Plateau
Shen, Xiangjin (Chinese Academy of Sciences. Northeast Institute of Geography and Agroecology)
Shen, Miaogen (Beijing Normal University. Faculty of Geographical Science. State Key Laboratory of Earth Surface Processes and Resource Ecology)
Wu, Chaoyang (Chinese Academy of Sciences. Institute of Geographic Sciences and Natural Resources Research)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Ciais, Philippe (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Zhang, Jiaqi (Chinese Academy of Sciences. Northeast Institute of Geography and Agroecology)
Freeman, Chris (Bangor University. School of Natural Sciences)
Palmer, Paul I. (University of Edinburgh. School of GeoSciences)
Liu, Binhui (Northeast Forestry University. College of Forestry)
Henderson, Mark (Northeastern University. Mills College)
Song, Zhaoliang (Tianjin University. School of Earth System Science. Institute of Surface-Earth System Science)
Sun, Shaobo (Tianjin University. School of Earth System Science. Institute of Surface-Earth System Science)
Lu, Xianguo (Chinese Academy of Sciences. Northeast Institute of Geography and Agroecology)
Jiang, Ming (Chinese Academy of Sciences. Northeast Institute of Geography and Agroecology)

Data:	2023
Resum:	The Tibetan Plateau, housing 20% of China's wetlands, plays a vital role in the regional carbon cycle. Examining the phenological dynamics of wetland vegetation in response to climate change is crucial for understanding its impact on the ecosystem. Despite this importance, the specific effects of climate change on wetland vegetation phenology in this region remain uncertain. In this study, we investigated the influence of climate change on the end of the growing season (EOS) of marsh wetland vegetation across the Tibetan Plateau, utilizing satellite-derived Normalized Difference Vegetation Index (NDVI) data and observational climate data. We observed that the regionally averaged EOS of marsh vegetation across the Tibetan Plateau was significantly (p < . 05) delayed by 4. 10 days/decade from 2001 to 2020. Warming preseason temperatures were found to be the primary driver behind the delay in the EOS of marsh vegetation, whereas preseason cumulative precipitation showed no significant impact. Interestingly, the responses of EOS to climate change varied spatially across the plateau, indicating a regulatory role for hydrological conditions in marsh phenology. In the humid and cold central regions, preseason daytime warming significantly delayed the EOS. However, areas with lower soil moisture exhibited a weaker or reversed delay effect, suggesting complex interplays between temperature, soil moisture, and EOS. Notably, in the arid southwestern regions of the plateau, increased preseason rainfall directly delayed the EOS, while higher daytime temperatures advanced it. Our results emphasize the critical role of hydrological conditions, specifically soil moisture, in shaping marsh EOS responses in different regions. Our findings underscore the need to incorporate hydrological factors into terrestrial ecosystem models, particularly in cold and dry regions, for accurate predictions of marsh vegetation phenological responses to climate change. This understanding is vital for informed conservation and management strategies in the face of current and future climate challenges.
Ajuts:	Ministerio de Ciencia e Innovación TED2021-132627B-I00
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Autumn phenology ; Climate change ; Marsh wetlands ; Tibetan Plateau ; Vegetation ; Water condition
Publicat a:	Global change biology, Vol. 30, Issue 1 (January 2023) , art. e17097, ISSN 1365-2486

DOI: 10.1111/gcb.17097

Postprint 42 p, 2.1 MB

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