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Okayama University (2009)

Eco-physiological function of adventitious roots on growth of Sabina vulgaris Ant., a decumbent shrub in semi-arid area

Yang, Lingli

Titre : Eco-physiological function of adventitious roots on growth of Sabina vulgaris Ant., a decumbent shrub in semi-arid area

Auteur : Yang, Lingli

Université de soutenance : Okayama University

Grade : Doctoral Thesis 2009

Présentation
Sabina vulgaris Ant. is a coniferous evergreen shrub and one of the dominant species in semi-arid area of China. It is characterized by long decumbent stem with adventitious roots and dense canopy, and plays an important role in the ecosystem because of its pronounced effects in protecting from sand moving and fixing sand-dunes. The object of this study was to clarify the function of adventitious roots and the water use properties for an eco-physiological understanding of the mechanism of the growth of S. vulgaris in the harsh semi-arid area. S. vulgaris adapts to diverse natural habitats and seasonal variation of water conditions in semi-arid area not only through the restriction of water loss and water conductance but also the improvement in water absorption through the emergence and increase of adventitious roots. The reduction of stomata restricted the water loss from leaf. The decrease of specific hydraulic conductivity restricted the water supply through xylem and therefore also reduced the water loss from leaf. The decline of leaf area directly reduced the total area of water loss and also indirectly increased the water supply from xylem to unit leaf area. Adventitious roots provide an additional water supply for the decumbent stem growth, especially in the tip part. Water absorption by dense adventitious roots improves the effective use of rainfall, leading to high growth rate of patch size. In variable water-condition of semi-arid area, S. vulgaris improve the ability of water absorption by the expansion of water absorption area horizontally and vertically and therefore promotes the elongation of decumbent stems and enlargement of the patches in association with the appearance of adventitious roots

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Résumé

Page publiée le 26 octobre 2016, mise à jour le 19 avril 2020