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Wednesday, 20 July 2016

Canopy transpiration in two Japanese cypress forests with contrasting structures

Published Date
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Title 

Canopy transpiration in two Japanese cypress forests with contrasting structures

  • Author 
  • Kenji Tsuruta 
  • , Hikaru Komatsu
  • , Tomonori Kume
  • , Yoshinori Shinohara
  • , Kyoichi Otsuki

Abstract

Canopy transpiration (E C) varies among forest stands with different structures. To evaluate different E C for Japanese cypress we observed E C for 5 months, by use of the sap flow technique, in two adjacent stands of different ages with contrasting structures. Mean diameter at breast height was 13.5 and 44.6 cm and stem density was 2100 and 350 trees ha−1 for the Sakuta and Hiwada plots, respectively. Mean E C measured was 1.3 mm day−1 for the Sakuta plot and 0.7 mm day−1 for the Hiwada plot (or 53 % of that for the Sakuta plot). This difference between E C was caused by differences between both mean stand sap flux density (J S) and stand sapwood area (A S__stand): J S for the Hiwada plot was 69 % of that for the Sakuta plot and A S_stand for the Hiwada plot was 75 % of that for the Sakuta plot. The difference between J S was primarily caused by different reference J S for given meteorological conditions, not by the different response of J S to meteorological conditions. Previous studies of coniferous plantation forests in Japan reported that differences between E C among stands with different structures were mainly caused by different A S_stand. This study revealed this is not always true, and that differences between J S should also be considered when predicting differences between E C among stands with different structures.

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For further details log on website :
http://link.springer.com/article/10.1007/s10310-015-0495-0
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