Belowground hydraulic conductance in a mature boreal Scots pine tree

A. Lintunen, T. Paljakka, Y. Salmon, T. Hölttä
We studied the dynamics of belowground hydraulic conductance (kbg) of a mature Scots pine tree in field conditions using continuous xylem diameter change and sap flow measurements over a full growing season in a boreal environment. Our aim was to analyze how kbg is linked to soil temperature and soil water content. kbg was calculated as the ratio of daily maximum sap flow rate to the difference between stem and soil water potential estimated from daily diameter variations of xylem measured with point dendrometers. kbg increased with increasing soil temperature in spring and autumn when soil temperatures were below +8°C. kbg also increased with increasing soil water content if soil temperature was high enough as was the case in summer. The results suggest that kbg in the studied tree was more limited by soil temperature than water content.
Lintunen, A., Paljakka, T., Salmon, Y. and Hölttä, T. (2018). Belowground hydraulic conductance in a mature boreal Scots pine tree. Acta Hortic. 1222, 103-108
DOI: 10.17660/ActaHortic.2018.1222.14
cost of water, hydraulic conductance, Pinus sylvestris, point dendrometer, sap flow

Acta Horticulturae