Variations micrométriques des tiges de jeunes plants de &lt;em&gt;Acacia senegal&lt;/em&gt; (L.) Wildd dans différents régimes hydriques

Kane, Ibrahima; Akpo, LE; Grouzis, Michel

doi:10.4314/ijbcs.v6i1.21

Cited by 1 publication

(1 citation statement)

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“…The use of perennial leguminous species to afforest degraded lands has been advocated for the Sahel region (Bradbury, 1990;Aronson et al, 1993;Kane et al, 2012;Bayen et al, 2016). The present study focuses on four indigenous species, Senegalia dudgeonii, Senegalia gourmaensis, Vachellia nilotica and Vachellia tortilis, which are ecologically important due to their potential to adapt to environmental constraints and are widely used for afforestation (Traoré, 2008).…”

Section: Introductionmentioning

confidence: 99%

Effect of water stress on growth and dry matter distribution of four dryland species used in tree planting in the Sahel

Bayen

Lykke

Kagambèga

et al. 2021

Forestry: An International Journal of Forest Research

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Water stress is the most important factor limiting early survival and growth of seedlings in arid and semi-arid zones. Many woody species develop adaptive mechanisms in response to water stress. This study assesses survival rate, growth and dry matter distribution in response to water stress in four dryland species (Senegalia dudgeonii, Senegalia gourmaensis, Vachellia nilotica and Vachellia tortilis). A total of 240 seedlings (60 per species) were grown using a completely randomized block design with three replicates in each of three water treatments (control = 100 percent of field capacity; moderate water stress = 50 percent of field capacity; severe water stress = 25 percent of field capacity) with a 7 day watering frequency. Data were collected on seedling survival, height, collar diameter, leaf production and dry matter distribution. Survival rate of the four species was not affected by water stress. However, the morphological responses to water stress were significantly different between species. Water stress resulted in significant reductions in height and collar diameter, higher below-ground biomass and significant increase in shedding of leaves. Under water stress, S. dudgeonii, S. gourmaensis and V. tortilis invested more in root growth. The allocation pattern from above-ground to below-ground parts was found to be the main adaption to drought. In contrast, V. nilotica gave preference to above-ground development, which could be an indication that the seedlings are adapted to grow under severe water stress. The results confirm the interspecific genetic differences in growth and dry matter distribution among species. These variations in water stress response may be used as criteria for species selection for degraded land reforestation.

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Section: Introductionmentioning

confidence: 99%