Velocity of change in vegetation productivity over northern high latitudes
Huang, Mengtian (Sino-French Institute for Earth System Science)
Piao, Shilong (Sino-French Institute for Earth System Science)
Janssens, Ivan (Universiteit Antwerpen. Departement Biologie)
Zhu, Zaichun (Sino-French Institute for Earth System Science)
Wang, Tao (Zhongguo ke xue yuan. Institute of Tibetan Plateau Research)
Wu, Donghai (Sino-French Institute for Earth System Science)
Ciais, Philippe (Laboratoire des Sciences du Climat et de l'Environnement)
Myneni, Ranga B. (Boston University. Department of Earth and Environment)
Peaucelle, Marc (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peng, Shushi (Sino-French Institute for Earth System Science)
Yang, Hui (Sino-French Institute for Earth System Science)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2017
Resum:	Warming is projected to increase the productivity of northern ecosystems. However, knowledge on whether the northward displacement of vegetation productivity isolines matches that of temperature isolines is still limited. Here we compared changes in the spatial patterns of vegetation productivity and temperature using the velocity of change concept, which expresses these two variables in the same unit of displacement per time. We show that across northern regions (>50° N), the average velocity of change in growing-season normalized difference vegetation index (NDVIGS, an indicator of vegetation productivity; 2. 8 ± 1. 1 km yr⁻¹) is lower than that of growing-season mean temperature (TGS; 5. 4 ± 1. 0 km yr⁻¹). In fact, the NDVIGS velocity was less than half of the TGS velocity in more than half of the study area, indicating that the northward movement of productivity isolines is much slower than that of temperature isolines across the majority of northern regions (about 80% of the area showed faster changes in temperature than productivity isolines). We tentatively attribute this mismatch between the velocities of productivity and temperature to the effects of limited resource availability and vegetation acclimation mechanisms. Analyses of ecosystem model simulations further suggested that limited nitrogen availability is a crucial obstacle for vegetation to track the warming trend.
Ajuts:	European Commission 610028
Nota:	Altres ajuts: This study was supported by National Natural Science Foundation of China (41530528), and the 111 Project (B14001)
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Biogeography ; Climate-change ecology
Publicat a:	Nature ecology & evolution, Vol. 1 (Nov. 2017) , p. 1649-1654, ISSN 2397-334X

DOI: 10.1038/s41559-017-0328-y

Post-print 27 p, 1.5 MB

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