Effects of size and microclimate on whole-tree water use and hydraulic regulation in Schima superba trees

PeerJ
Xiao-Wei ZhaoChun-Fang Zhang

Abstract

Plant-water relations have been of significant concern in forestry and ecology studies in recent years, yet studies investigating the annual differences in the characteristics of inter-class water consumption in trees are scarce. We classified 15 trees from a Schima superba plantation in subtropical South China into four ranks using diameter at breast height (DBH). The inter-class and whole-tree water use were compared based on three parameters: sap flux density, whole-tree transpiration and canopy transpiration over two years. Inter-class hydraulic parameters, such as leaf water potential, stomatal conductance, hydraulic conductance, and canopy conductance were also compared. (1) Mean water consumption of the plantation was 287.6 mm over a year, 165.9 mm in the wet season, and 121.7 mm in the dry season. Annual mean daily water use was 0.79 mm d-1, with a maximum of 1.39 mm d-1. (2) Isohydrodynamic behavior were found in S. superba. (3) Transpiration was regulated via both hydraulic conductance and stoma; however, there was an annual difference in which predominantly regulated transpiration. This study quantified annual and seasonal water use of a S. superba plantation and revealed the coordinated effect of stoma and hydraulic...Continue Reading

References

Nov 3, 2004·Tree Physiology·B D BovardH P Schmid
Aug 16, 2008·The Plant Journal : for Cell and Molecular Biology·Wei ZhangSarah M Assmann
Oct 14, 2009·Tree Physiology·Tomonori KumeKyoichi Otsuki
Aug 23, 2011·Tree Physiology·Krõõt Aasamaa, Anu Sõber
Jul 6, 2014·The New Phytologist·Jordi Martínez-VilaltaMaurizio Mencuccini
Jul 1, 2003·Functional Plant Biology : FPB·Ping LuWarren J Müller

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