Effects of size and microclimate on whole-tree water use and hydraulic regulation inSchima superbatrees

BackgroundPlant-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.MethodsWe classified 15 trees from aSchima superbaplantation 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.Results(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 inS. superba. (3) Transpiration was regulated via both hydraulic conductance and stoma; however, there was an annual difference in which predominantly regulated transpiration.DiscussionThis study quantified annual and seasonal water use of aS. superbaplantation and revealed the coordinated effect of stoma and hydraulic conductance on transpiration. These results provide information for large-scale afforestation and future water management.

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Influence of temporospatial variation in sap flux density on estimates of whole-tree water use in Avicennia marina

Trees ◽

10.1007/s00468-014-1105-z ◽

2014 ◽

Vol 29 (1) ◽

pp. 215-222 ◽

Cited By ~ 14

Author(s):

Bart A. E. Van de Wal ◽

Adrien Guyot ◽

Catherine E. Lovelock ◽

David A. Lockington ◽

Kathy Steppe

Keyword(s):

Flux Density ◽

Water Use ◽

Avicennia Marina ◽

Sap Flux ◽

Sap Flux Density ◽

Tree Water Use ◽

Whole Tree

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INFLUENCE OF SPATIAL VARIATION IN SAP FLUX DENSITY ON ESTIMATES OF WHOLE-TREE WATER USE IN AVICENNIA MARINA

Acta Horticulturae ◽

10.17660/actahortic.2013.991.12 ◽

2013 ◽

pp. 101-106

Author(s):

B.A.E. Van de Wal ◽

A. Guyot ◽

C.E. Lovelock ◽

D.A. Lockington ◽

K. Steppe

Keyword(s):

Spatial Variation ◽

Flux Density ◽

Water Use ◽

Avicennia Marina ◽

Sap Flux ◽

Sap Flux Density ◽

Tree Water Use ◽

Whole Tree

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Whole-tree water relations of co-occurring mature Pinus palustris and Pinus elliottii var. elliottii

Canadian Journal of Forest Research ◽

10.1139/x10-230 ◽

2011 ◽

Vol 41 (3) ◽

pp. 509-523 ◽

Cited By ~ 16

Author(s):

Carlos A. Gonzalez-Benecke ◽

Timothy A. Martin ◽

Wendell P. Cropper,

Keyword(s):

Leaf Area ◽

Water Use ◽

Water Relations ◽

Longleaf Pine ◽

Pinus Palustris ◽

Pinus Elliottii ◽

Hydraulic Conductance ◽

Slash Pine ◽

Southeastern Us ◽

Whole Tree

The natural range of longleaf pine ( Pinus palustris P. Mill.) and slash pine ( Pinus elliottii var. elliottii Engelm.) includes most of the southeastern US Coastal Plain, and there is now considerable interest in using these species for ecological forestry, restoration, and carbon sequestration. It is therefore surprising that little information is currently available concerning differences in their ecological water relations in natural stands. In this study, we compared water use, stomatal conductance at the crown scale (Gcrown), and whole-tree hydraulic conductance of mature pine trees growing in a naturally regenerated mixed stand on a flatwoods site in north-central Florida. We found remarkable similarities between longleaf and slash pine in stored water use, nocturnal transpiration, and whole-tree hydraulic conductance. Mean daily transpiration rate was higher for slash than for longleaf pine, averaging 39 and 26 L·tree–1, respectively. This difference was determined by variations in tree leaf area. Slash pine had 60% more leaf area per unit basal sapwood area than longleaf pine, but the larger plasticity of longleaf pine stomatal regulation partially compensated for leaf area differences: longleaf pine had higher Gcrown on days with high volumetric water content (θv) but this was reduced to similar or even lower values than for slash pine on days with low θv. There was no species difference in the sensitivity of Gcrown to increasing vapor pressure deficit.

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Peer Review #3 of "Effects of size and microclimate on whole-tree water use and hydraulic regulation in Schima superba trees (v0.1)"

10.7287/peerj.5164v0.1/reviews/3 ◽

2018 ◽

Keyword(s):

Peer Review ◽

Water Use ◽

Schima Superba ◽

Tree Water Use ◽

Whole Tree

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Coordination of leaf area, sapwood area and canopy conductance leads to species convergence of tree water use in a remnant evergreen woodland

Australian Journal of Botany ◽

10.1071/bt07091 ◽

2008 ◽

Vol 56 (2) ◽

pp. 97 ◽

Cited By ~ 31

Author(s):

Melanie Zeppel ◽

Derek Eamus

Keyword(s):

Leaf Area ◽

Water Use ◽

Canopy Conductance ◽

Evaporative Demand ◽

Sapwood Area ◽

Huber Value ◽

Tree Water Use ◽

Decoupling Coefficient ◽

The Relationship ◽

Daily Total

This paper compares rates of tree water use, Huber value, canopy conductance and canopy decoupling of two disparate, co-occurring tree species, in a stand of remnant native vegetation in temperate Australia in order to compare their relative behaviour seasonally and during and after a drought. The study site was an open woodland dominated by Eucalyptus crebra F.Muell. (a broad-leaved species) and Callitris glaucophylla J.Thompson & L.A.S. Johnson (a needle-leaved tree species). Tree water use was measured with sapflow sensors and leaf area and sapwood area were measured destructively on felled trees. The Huber value was calculated as the ratio of sapwood area to leaf area. Diameter at breast height (DBH) of the stem was used as a measure of tree size. Canopy conductance was calculated with an inversion of the Penman–Monteith equation, whereas canopy decoupling) was calculated as described by Lu et al. (2003). The relationship between DBH and daily total water use varied during the four measurement periods, with largest rates of water use observed in summer 2003–2004, following a large rainfall event and the smallest maximum water use observed in winter 2003 when monthly rainfall was much less than the long-term mean for those months. Despite differences in the relationship between sapwood area and DBH for the two species, the relationship between daily total water use and DBH did not differ between species at any time. The same rates of water use for the two species across sampling periods arose through different mechanisms; the eucalypt underwent significant changes in leaf area whereas the Callitris displayed large changes in canopy conductance, such that tree water use remained the same for both species during the 2-year period. Canopy conductance and the decoupling coefficient were both significantly larger in winter than summer in both years. The generally low decoupling coefficient (0.05–0.34) reflects the low leaf area index of the site. When evaporative demand was small (winter), the degree of stomatal control was small and the decoupling coefficient was large. There was no relationship between tree size and either canopy conductance or the decoupling coefficient. Transpiration rates generally showed little variation between seasons and between species because of the balance between changes in leaf area, canopy conductance and evaporative demand. The occurrence of a significant drought did not appear to prevent these coordinated changes from occurring, with the result that convergence in water use was observed for these two disparate species.

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