PMID: 15234892Jul 6, 2004Paper

Diurnal and seasonal variability in the radial distribution of sap flow: predicting total stem flow in Pinus taeda trees

Tree Physiology
Chelcy R FordRobert O Teskey

Abstract

We monitored the radial distribution of sap flux density (v; g H2O m(-2) s(-1)) in the sapwood of six plantation-grown Pinus taeda L. trees during wet and dry soil periods. Mean basal diameter of the 32-year-old trees was 33.3 cm. For all trees, the radial distribution of sap flow in the base of the stem (i.e., radial profile) was Gaussian in shape. Sap flow occurred maximally in the outer 4 cm of sapwood, comprising 50-60% of total stem flow (F), and decreased toward the center, with the innermost 4 cm of sapwood (11-15 cm) comprising less than 10% of F. The percent of flow occurring in the outer 4 cm of sapwood was stable with time (average CV < 10%); however, the percentage of flow occurring in the remaining sapwood was more variable over time (average CV > 40%). Diurnally, the radial profile changed predictably with time and with total stem flow. Seasonally, the radial profile became less steep as the soil water content (theta) declined from 0.38 to 0.21. Throughout the season, daytime sap flow also decreased as theta decreased; however, nighttime sap flow (an estimate of stored water use) remained relatively constant. As a result, the percentage of stored water use increased as theta declined. Time series analysis of 15-mi...Continue Reading

Citations

Jun 7, 2011·Ecological Applications : a Publication of the Ecological Society of America·Diane E PatakiStephanie Pincetl
Feb 22, 2012·Environmental Pollution·Silvano FaresAllen H Goldstein
Jan 26, 2013·American Journal of Botany·David M BarnardFrederick C Meinzer

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