Internal redistribution of N in Sitka spruce seedlings with partly droughted root systems

Split pots were used to allow measurement of the potential N retranslocation from roots of Sitka spruce subject tO drought. Withholding water from one part of the root system had no effect upon increases in total weight and N content of the whole trees, or of the shoot and roots separately. However,...

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Bibliographic Details
Published inForest science Vol. 37; no. 3
Main Authors Ferrier, R.C. (Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, Scotland), Alexander, I.J
Format Journal Article
LanguageEnglish
Published 01.08.1991
Subjects
AZOTE
FISIOLOGIA VEGETAL
NITROGENO
PHYSIOLOGIE VEGETALE
PICEA SITCHENSIS
PLANTULAS
PLANTULE
SECHERESSE
SEQUIA
SISTEMA RADICULAR
SYSTEME RACINAIRE
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Summary:Split pots were used to allow measurement of the potential N retranslocation from roots of Sitka spruce subject tO drought. Withholding water from one part of the root system had no effect upon increases in total weight and N content of the whole trees, or of the shoot and roots separately. However, the distribution of root weight and N content between the split parts of the root system did change. The results indicate that the droughted roots of these spruce seedlings retranslocated 23% of the nitrogen initially present in them before experimental conditions were imposed. This retranslocation is considerably less than that reported elsewhere for senescing needles, but fine-root nitrogen retranslocation may be a potentially significant flux in forest systems where fine-root turnover is high. There was some evidence of N movement from needles to sustain compensatory growth of roots in response to nutrient and/or water stress
Bibliography:9178226
F60
ISSN:0015-749X
1938-3738
DOI:10.1093/forestscience/37.3.860