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<p>Accurately measuring water consumption of an ecosystem helps improve understanding water management, especially in areas with water restriction. This study aimed to compare the hourly, daily and accumulated transpiration rates of <i>Eucalyptus urophylla</i> × <i>Eucalyptus grandis</i> I144, CO1407, and A211 clone seedlings. Leaf area, and root, shoot, and total dry mass were measured 120&#xa0;days after transplanting. Furthermore, water use efficiency, the relationship between transpiration and leaf area, and between daily transpiration and energy availability provided by radiation balance and leaf area ratio were estimated. Leaf transpiration increased concomitantly with growth in all clones, reaching the maximum with the highest leaf area. The water volume consumed at the end of 1689 accumulated degree-days was around 20% higher in the I144 clone. The clones showed differences in hourly transpiration throughout the growth stages (20, 40, 60, and 120 DAT). CO<sub>2</sub> assimilation varied between clones, with higher net photosynthesis in A211, while the I144 and CO1407 clones showed higher quantum yield. The increase in leaf area promoted an increase in the transpiration rate and improved the efficiency of using the energy balance for water loss from the plants throughout the experiment. Dry mass production and partitioning were higher in I144 and A211. Conversely, A211 and CO1407 had higher dry mass yield per gram of water transpired. As a result, the I144 clone is preferably recommended among the most productive clones for areas free from water restriction, while the A211 clone is recommended for areas with low water availability.</p>

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Light, transpiration and water use efficiency: contrasts among seedlings of three Eucalyptus urophylla ×  Eucalyptus grandis clones

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Aline Ramalho dos Santos,
  • José Eduardo Macedo Pezzopane,
  • Paulo Araquém Ramos Cairo,
  • Elbya Leão Gibson,
  • Manuel Fernández Martínez,
  • João Vitor Toledo,
  • José Ricardo Macedo Pezzopane,
  • Vinícius Alves Rodrigues

摘要

Accurately measuring water consumption of an ecosystem helps improve understanding water management, especially in areas with water restriction. This study aimed to compare the hourly, daily and accumulated transpiration rates of Eucalyptus urophylla × Eucalyptus grandis I144, CO1407, and A211 clone seedlings. Leaf area, and root, shoot, and total dry mass were measured 120 days after transplanting. Furthermore, water use efficiency, the relationship between transpiration and leaf area, and between daily transpiration and energy availability provided by radiation balance and leaf area ratio were estimated. Leaf transpiration increased concomitantly with growth in all clones, reaching the maximum with the highest leaf area. The water volume consumed at the end of 1689 accumulated degree-days was around 20% higher in the I144 clone. The clones showed differences in hourly transpiration throughout the growth stages (20, 40, 60, and 120 DAT). CO2 assimilation varied between clones, with higher net photosynthesis in A211, while the I144 and CO1407 clones showed higher quantum yield. The increase in leaf area promoted an increase in the transpiration rate and improved the efficiency of using the energy balance for water loss from the plants throughout the experiment. Dry mass production and partitioning were higher in I144 and A211. Conversely, A211 and CO1407 had higher dry mass yield per gram of water transpired. As a result, the I144 clone is preferably recommended among the most productive clones for areas free from water restriction, while the A211 clone is recommended for areas with low water availability.