Maria Medeiros, Cynthia L. Wright, André Luiz Alves de Lima, Nielson Dinivan da Silva Brito, Rodolfo Souza, José Raliuson Inácio Silva, Eduardo Souza
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引用次数: 0
Key message
The high-wood-density species displays greater water limitation tolerance, as it maintains leaf transpiration under drought conditions.
Abstract
The relationship between environmental conditions and plant hydraulic safety is essential to understand species’ strategies to minimize damage to their hydraulic structure yet maintain function. In the Brazilian semi-arid, the relationships between rainfall seasonality, hydraulic conductivity, wood density, stomatal conductance, and phenology in different species still needs to be clarified. To better understand these relationships, we selected two deciduous trees species with contrasting wood density: (1) Commiphora leptophloeos (Mart.) J.B. Gillett (low wood density) and (2) Cenostigma pyramidale (Tul.) E. Gagnon & G. P. Lewis (high wood density) from the Caatinga dry forest of northeast Brazil. We tracked monthly measurements of whole-tree hydraulic conductivity, leaf stomatal conductance, leaf transpiration rate, xylem water potential, and phenology. We found that the low-wood-density species had a higher whole-tree hydraulic conductivity and an early leaf flush and fall. In addition, lower leaf transpiration rate and higher water storage capacity maintained high xylem water potential and stomatal conductance values, especially in the rainy season. On the other hand, the high-wood-density species had a lower whole-tree hydraulic conductivity and higher leaf transpiration rate, even during the dry season. These results point to the divergent hydraulic strategies employed by each species, further suggesting opposing hydraulic safety pathways during drought.
摘要环境条件与植物水力安全之间的关系对于了解物种在保持功能的同时尽量减少对水力结构的破坏的策略至关重要。在巴西半干旱地区，不同物种的降雨季节性、水力传导性、木质密度、气孔传导性和物候之间的关系仍有待澄清。为了更好地理解这些关系，我们从巴西东北部的卡廷加干旱森林中选取了两个木材密度截然不同的落叶树种：（1）Commiphora leptophloeos (Mart.) J.B. Gillett（木材密度低）和（2）Cenostigma pyramidale (Tul.) E. Gagnon & G. P. Lewis（木材密度高）。我们对全树水力传导率、叶片气孔传导率、叶片蒸腾速率、木质部水势和物候进行了月度跟踪测量。我们发现，低木质密度树种的全树水力传导率较高，叶片潮红和落叶较早。此外，较低的叶片蒸腾速率和较高的储水能力可维持较高的木质部水势和气孔导度值，尤其是在雨季。另一方面，木材密度高的树种即使在旱季也有较低的全树水力传导率和较高的叶片蒸腾速率。这些结果表明，每种树种都采用了不同的水力策略，进一步表明在干旱期间水力安全途径是相反的。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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