Comparison of an isotopic method and the Penman–Monteith equation for estimating transpiration from Scots pine

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Abstract
The Penman–Monteith equation was used with measured values of stomatal conductance and leaf area, in conjunction with weather station measurements of net radiation, vapor pressure deficit, and wind speed to calculate the transpiration rates of two Scots pine (Pinussylvestris L.) stands of widely different densities. Transpiration was compared with water uptake estimated from 32P radioisotope movement through trees of known conducting area and water content. Uptake consistently lagged behind transpiration throughout the day. From dawn to dawn, however, uptake and transpiration were in close agreement as a result of recharge during the night.

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