Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees
Background and Aims Recent studies showed a positive tree response to Na addition in K-depleted tropical soils. Our study aimed to gain insight into the effects of K and Na fertilizations on leaf area components for a widely planted tree species. Methods Leaf expansion rates, as well as nutrient, polyol and soluble sugar concentrations, were measured from emergence to abscission of tagged leaves in 1-year-old Eucalyptus grandis plantations. Leaf cell size and water status parameters were compared 1 and 2 months after leaf emergence in plots with KCl application (+K), NaCl application (+Na) and control plots (C). Results K and Na applications enhanced tree leaf area by increasing both leaf longevity and the mean area of individual leaves. Higher cell turgor in treatments +K and +Na than in the C treatment resulting from higher concentrations of osmotica contributed to increasing both palisade cell diameters and the size of fully expanded leaves. Conclusions Intermediate total tree leaf area in treatment +Na compared to treatments C and +K might result from the capacity of Na to substitute K in osmoregulatory functions, whereas it seemed unable to accomplish other important K functions that contribute to delaying leaf senescence.
| Main Authors: | , , , , , , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | K10 - Production forestière, F62 - Physiologie végétale - Croissance et développement, F04 - Fertilisation, Eucalyptus grandis, plantation forestière, fertilisation, potassium, sodium, surface foliaire, analyse de tissu foliaire, croissance, fertilité du sol, http://aims.fao.org/aos/agrovoc/c_2693, http://aims.fao.org/aos/agrovoc/c_3048, http://aims.fao.org/aos/agrovoc/c_10795, http://aims.fao.org/aos/agrovoc/c_6139, http://aims.fao.org/aos/agrovoc/c_7145, http://aims.fao.org/aos/agrovoc/c_16110, http://aims.fao.org/aos/agrovoc/c_36521, http://aims.fao.org/aos/agrovoc/c_3394, http://aims.fao.org/aos/agrovoc/c_7170, http://aims.fao.org/aos/agrovoc/c_1070, |
| Online Access: | http://agritrop.cirad.fr/571536/ http://agritrop.cirad.fr/571536/1/document_571536.pdf |
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