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Gas exchange of four woody species under salinity and soil waterlogging
ABSTRACT The objective of this study was to evaluate gas exchanges in seedlings of forest species grown in saline soils and subjected to soil waterlogging cycles. The experimental design was completely randomized in a factorial arrangement, with four forest species: Myracrodruon urundeuva Fr Allemão...
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Published in: | Revista brasileira de engenharia agrícola e ambiental 2017-10, Vol.21 (10), p.670-674 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
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Summary: | ABSTRACT The objective of this study was to evaluate gas exchanges in seedlings of forest species grown in saline soils and subjected to soil waterlogging cycles. The experimental design was completely randomized in a factorial arrangement, with four forest species: Myracrodruon urundeuva Fr Allemão, Mimosa caesalpiniifolia Benth, Tabebuia impetiginosa (Mart. ex. DC.) Standl and Azadirachta indica A. Juss, two soil salinity levels (1.2 and 8.6 dS m-1) and two water regimes (with and without waterlogging). Measurements of stomatal conductance, transpiration and CO2 assimilation rate were performed before and after each waterlogging period. The interaction of the highest saline level (8.6 dS m-1) and waterlogging caused greater reductions in leaf gas exchange, except for Mimosa caesalpiniifolia Benth. Tabebuia impetiginosa (Mart. ex. DC.) Standl was the species with highest sensitivity to both studied factors of stress.
RESUMO Objetivou-se, com este trabalho, avaliar as trocas gasosas de mudas de espécies florestais cultivadas em solos salinos e submetidas a ciclos de encharcamento do solo. O delineamento experimental foi inteiramente casualizado em esquema fatorial, com quatro espécies florestais Myracrodruon urundeuva Fr Allemão, Mimosa caesalpiniifolia Benth, Tabebuia impetiginosa (Mart. ex. DC.) Standl e Azadirachta indica A. Juss, dois níveis de salinidade do solo (1,2 e 8,6 dS m-1) e dois regimes hídricos (com e sem encharcamento do solo). Foram realizadas medições, antes e depois de cada período de encharcamento, da condutância estomática, transpiração e taxa de assimilação de CO2. A interação do maior nível salino (8,6 dS m-1) e do encharcamento do solo causou maiores reduções nas trocas gasosas, exceto para as mudas de Mimosa caesalpiniifolia Benth. Tabebuia impetiginosa (Mart. ex. DC.) Standl foi a espécie que apresentou maior sensibilidade aos dois fatores de estresse estudados. |
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ISSN: | 1415-4366 1807-1929 1415-4366 |
DOI: | 10.1590/1807-1929/agriambi.v21n10p670-674 |