Contribution of lianas to community-level canopy transpiration in a warm-temperate forest

Ryuji Ichihashi, Chen Wei Chiu, Hikaru Komatsu, Tomonori Kume, Yoshinori Shinohara, Makiko Tateishi, Kenji Tsuruta, Kyoichi Otsuki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Lianas (woody climbers) have a greater amount of leaves relative to basal area or standing biomass than trees, and very wide vessels that permit efficient water transport. These features suggest that lianas possibly consume proportionally more water through transpiration than trees. Despite their potential importance, researchers have made only limited attempts to evaluate effects of lianas on forest water dynamics. We conducted sap flow measurements for 1 year using a thermal dissipation method for four species each of lianas and trees in a liana-rich, warm-temperate forest in Japan and estimated the contribution of lianas to stand canopy transpiration. Based on a calibration measuring water uptake rates from cut-stem ends, the actual sap flux (Fd) in liana stems was several times greater than those estimated from the original calibration provided for the method. In the field, lianas showed an average of 2–4 times greater Fd than trees throughout the year. Except for this difference, diurnal and seasonal patterns of relative changes of Fd were similar in both groups. The whole-plant transpiration (Qt) of sample plants was exponentially related to basal diameter for both lianas and trees; Qt of lianas increased more steeply with basal diameter than that of trees. By extrapolating the relationships between Qt and basal diameter to the inventory data of the study plot, we estimated that lianas contributed 12·8% to the annual stand canopy transpiration while comprising 2·3% of stand basal area, which probably reflected the top-heavy architecture of lianas. Our results indicate that the contribution of lianas to forest water dynamics may be several times greater than their contribution to forest basal area. This implies that a slight increase of liana abundance might have greater effects on water dynamics and, through competitions with trees for limited water, the carbon sequestration capacity of forests than expected from the increase in basal area. This study underlines the necessity of evaluating the relative importance of lianas to forest water dynamics in forests world-wide. A lay summary is available for this article.

Original languageEnglish
Pages (from-to)1690-1699
Number of pages10
JournalFunctional Ecology
Volume31
Issue number9
DOIs
Publication statusPublished - Sep 1 2017

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lianas
temperate forests
temperate forest
transpiration
canopy
basal area
water
stem
calibration
sap flow
flow measurement
water uptake
carbon sequestration
dissipation
vessel
stems
xylem vessels
diurnal variation
tree and stand measurements
sap

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics

Cite this

Contribution of lianas to community-level canopy transpiration in a warm-temperate forest. / Ichihashi, Ryuji; Chiu, Chen Wei; Komatsu, Hikaru; Kume, Tomonori; Shinohara, Yoshinori; Tateishi, Makiko; Tsuruta, Kenji; Otsuki, Kyoichi.

In: Functional Ecology, Vol. 31, No. 9, 01.09.2017, p. 1690-1699.

Research output: Contribution to journalArticle

Ichihashi, Ryuji ; Chiu, Chen Wei ; Komatsu, Hikaru ; Kume, Tomonori ; Shinohara, Yoshinori ; Tateishi, Makiko ; Tsuruta, Kenji ; Otsuki, Kyoichi. / Contribution of lianas to community-level canopy transpiration in a warm-temperate forest. In: Functional Ecology. 2017 ; Vol. 31, No. 9. pp. 1690-1699.
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