Characteristics of sap flux measured in a Cryptomeria japonica forest in Tanzawa Mountains

抄録

Transpiration is a major part of the water cycle in forested ecosystem. Sap flow (Fd) techniques are useful for investigating stand transpiration even on steep slopes. To understand the stand transpiration mechanism, circumferential and tree-to-tree variations in sap flow and their temporal changes are important. The study was conducted to comprehend the spatial and temporal variations in Fd in an evenly aged 30-year-old Japanese cedar forest in Tanzawa mountain, located in western part of Kanagawa Prefecture. In this study, we examined 1) circumferential variation, and 2) individual-to-individual variations in Fd, and 3) the effect of meteorological parameters on their variations using 32 sets of Granier type sensors inserted on 16 trees in a 20 x 20 experiment plot. The data was derived during the period from August 21st, 2017 to December 21st, 2017.