Growing-season temperature and precipitation are independent drivers of global variation in xylem hydraulic conductivity

Stem xylem-specific hydraulic conductivity (KS) represents the potential for plant water transport normalized by xylem cross-section, length, and driving force. Variation in KS has implications for plant transpiration and photosynthesis, growth and survival, and also the geographic distribution of s...

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Bibliographic Details
Published in:Global Change Biology
Main Authors: He, Pengcheng, Gleason, Sean M., Wright, Ian J. (R20529), Weng, Ensheng, Liu, Hui, Zhu, Shidan, Lu, Mingzhen, Luo, Qi, Li, Ronghua, Wu, Guilin, Yan, Enrong, Song, Yanjun, Mi, Xiangcheng, Hao, Guangyou, Reich, Peter B. (R16861), Wang, Yingping, Ellsworth, David S. (R11532), Ye, Qing
Other Authors: Hawkesbury Institute for the Environment (Host institution)
Format: Article in Journal/Newspaper
Language:English
Published: U.K., Wiley-Blackwell Publishing 2020
Subjects:
XXXXXX - Unknown
climatic changes
plants
xylem
hydraulic conductivity
transpiration
photosynthesis
Tundra
Online Access:https://doi.org/10.1111/GCB.14929
http://hdl.handle.net/1959.7/uws:53726
Description
Summary:Stem xylem-specific hydraulic conductivity (KS) represents the potential for plant water transport normalized by xylem cross-section, length, and driving force. Variation in KS has implications for plant transpiration and photosynthesis, growth and survival, and also the geographic distribution of species. Clarifying the global-scale patterns of KS and its major drivers are needed to achieve a better understanding of how plants adapt to different environmental conditions, particularly under climate change scenarios. Here, we compiled a xylem hydraulics dataset with 1186 species-at-site combinations (975 woody species representing 146 families, from 199 sites worldwide), and investigated how KS varied with climatic variables, plant functional types, and biomes. Growing-season temperature and growing-season precipitation drove global variation in KS independently. Both the mean and the variation in KS were highest in the warm and wet tropical regions, and lower in cold and dry regions, such as tundra and desert biomes. Our results suggest that future warming and redistribution of seasonal precipitation may have a significant impact on species functional diversity, and is likely to be particularly important in regions becoming warmer or drier, such as high latitudes. This highlights an important role for KS in predicting shifts in community composition in the face of climate change.

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