期刊
TREE PHYSIOLOGY
卷 30, 期 5, 页码 586-596出版社
OXFORD UNIV PRESS
DOI: 10.1093/treephys/tpq009
关键词
conductance; Eucalyptus; nocturnal; phenology; stomata; transpiration
类别
资金
- Australian Research Council [DP0879531]
- University of Western Sydney International Research Initiatives Scheme (IRIS) [71827]
- Boston University
- Fordham University
- Roberts Fund at Bowdoin College
- Australian Research Council [DP0879531] Funding Source: Australian Research Council
To identify environmental and biological drivers of nocturnal vapour exchange, we quantified intra-annual, intra- and inter-specific variation in nocturnal water transport among ecologically diverse Eucalyptus species. We measured sap flux (J(s)) and leaf physiology (leaf surface conductance (g(s)), transpiration (E) and water potential (Psi(l))) in three to five trees of eight species. Over 1 year, nocturnal J(s) (J(s,n)) contributed 5-7% of total J(s) in the eight species. The principal environmental driver of J(s,n) was the product of atmospheric vapour pressure deficit (D) and wind speed (U). Selected observations suggest that trees with higher proportions of young foliage may exhibit greater J(s,n) and nocturnal g(s) (g(s,n)). Compared with other tree taxa, nocturnal water use in Eucalyptus was relatively low and more variable within than between species, suggesting that (i) Eucalyptus as a group exerts strong nocturnal stomatal control over water loss and (ii) prediction of nocturnal flux in Eucalyptus may depend on simultaneous knowledge of intra-specific tree traits and nocturnal atmospheric conditions.
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