Genotypic variation in transpiration of coppiced poplar during the third rotation of a short-rotation bio-energy culture

Global Change Biology. Bioenergy
Alejandra NavarroR Ceulemans

Abstract

The productivity of short-rotation coppice (SRC) plantations with poplar (Populus spp.) strongly depends on soil water availability, which limits the future development of its cultivation, and makes the study of the transpirational water loss particularly timely under the ongoing climate change (more frequent drought and floods). This study assesses the transpiration at different scales (leaf, tree and stand) of four poplar genotypes belonging to different species and from a different genetic background grown under an SRC regime. Measurements were performed for an entire growing season during the third year of the third rotation in a commercial scale multigenotype SRC plantation in Flanders (Belgium). Measurements at leaf level were performed on specific days with a contrasted evaporative demand, temperature and incoming shortwave radiation and included stomatal conductance, stem and leaf water potential. Leaf transpiration and leaf hydraulic conductance were obtained from these measurements. To determine the transpiration at the tree level, single-stem sap flow using the stem heat balance (SHB) method and daily stem diameter variations were measured during the entire growing season. Sap flow-based canopy transpiration (Ec), se...Continue Reading

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Feb 28, 2017·Global Change Biology. Bioenergy·Jasper BloemenReinhart Ceulemans

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